./chc-comp-wrapper.sh ../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-169.smt2 .


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This is Ultimate 0.3.0-dev-42d8767-m
[2025-04-28 21:21:16,760 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2025-04-28 21:21:16,837 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa6afcc5-d799-4b66-a2b3-005ca70c2ed5/chc-comp25-scripts/participants/UltimateUnihorn/./chccomp-Unihorn_Default.epf
[2025-04-28 21:21:16,849 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2025-04-28 21:21:16,849 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2025-04-28 21:21:16,871 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2025-04-28 21:21:16,871 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2025-04-28 21:21:16,872 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2025-04-28 21:21:16,872 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2025-04-28 21:21:16,872 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2025-04-28 21:21:16,872 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2025-04-28 21:21:16,872 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * Use SBE=true
[2025-04-28 21:21:16,873 INFO  L151        SettingsManager]: Preferences of ChcToBoogie differ from their defaults:
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * Use one large procedure with gotos to replace tail recursive calls=false
[2025-04-28 21:21:16,873 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:16,873 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2025-04-28 21:21:16,873 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2025-04-28 21:21:16,874 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2025-04-28 21:21:16,874 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2025-04-28 21:21:16,874 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2025-04-28 21:21:16,874 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2025-04-28 21:21:16,875 INFO  L151        SettingsManager]: Preferences of SmtParser differ from their defaults:
[2025-04-28 21:21:16,875 INFO  L153        SettingsManager]:  * SmtParser Mode=UltimateTreeAutomizer
[2025-04-28 21:21:17,229 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2025-04-28 21:21:17,239 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2025-04-28 21:21:17,241 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2025-04-28 21:21:17,242 INFO  L270        PluginConnector]: Initializing SmtParser...
[2025-04-28 21:21:17,242 INFO  L274        PluginConnector]: SmtParser initialized
[2025-04-28 21:21:17,243 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa6afcc5-d799-4b66-a2b3-005ca70c2ed5/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-169.smt2
[2025-04-28 21:21:17,246 INFO  L314              SmtParser]: Parsing .smt2 file as a set of Horn Clauses
[2025-04-28 21:21:17,249 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
unknown
[2025-04-28 21:21:17,467 INFO  L339              SmtParser]: Successfully executed SMT file /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aa6afcc5-d799-4b66-a2b3-005ca70c2ed5/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-169.smt2
[2025-04-28 21:21:17,474 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2025-04-28 21:21:17,477 INFO  L133        ToolchainWalker]: Walking toolchain with 4 elements.
[2025-04-28 21:21:17,478 INFO  L112        PluginConnector]: ------------------------ChcToBoogie----------------------------
[2025-04-28 21:21:17,478 INFO  L270        PluginConnector]: Initializing ChcToBoogie...
[2025-04-28 21:21:17,478 INFO  L274        PluginConnector]: ChcToBoogie initialized
[2025-04-28 21:21:17,483 INFO  L184        PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,507 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17 Unit
[2025-04-28 21:21:17,508 INFO  L131        PluginConnector]: ------------------------ END ChcToBoogie----------------------------
[2025-04-28 21:21:17,509 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2025-04-28 21:21:17,509 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2025-04-28 21:21:17,509 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2025-04-28 21:21:17,521 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,521 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,539 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,540 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,542 INFO  L184        PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,543 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,545 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,549 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,549 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,571 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2025-04-28 21:21:17,571 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2025-04-28 21:21:17,574 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2025-04-28 21:21:17,574 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2025-04-28 21:21:17,575 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (1/1) ...
[2025-04-28 21:21:17,578 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:17,593 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:17,610 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /usr/bin/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2025-04-28 21:21:17,615 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2025-04-28 21:21:17,630 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure False given in one single declaration
[2025-04-28 21:21:17,631 INFO  L130     BoogieDeclarations]: Found specification of procedure False
[2025-04-28 21:21:17,631 INFO  L138     BoogieDeclarations]: Found implementation of procedure False
[2025-04-28 21:21:17,631 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g^g given in one single declaration
[2025-04-28 21:21:17,631 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g^g
[2025-04-28 21:21:17,631 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g^g
[2025-04-28 21:21:17,631 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g__1 given in one single declaration
[2025-04-28 21:21:17,631 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g__1
[2025-04-28 21:21:17,631 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g__1
[2025-04-28 21:21:17,631 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g__1_PRE given in one single declaration
[2025-04-28 21:21:17,633 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g__1_PRE
[2025-04-28 21:21:17,633 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g__1_PRE
[2025-04-28 21:21:17,633 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g__2 given in one single declaration
[2025-04-28 21:21:17,633 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g__2
[2025-04-28 21:21:17,633 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g__2
[2025-04-28 21:21:17,634 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g__2_PRE given in one single declaration
[2025-04-28 21:21:17,634 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g__2_PRE
[2025-04-28 21:21:17,634 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g__2_PRE
[2025-04-28 21:21:17,634 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INV_REC_g^g_PRE given in one single declaration
[2025-04-28 21:21:17,634 INFO  L130     BoogieDeclarations]: Found specification of procedure INV_REC_g^g_PRE
[2025-04-28 21:21:17,634 INFO  L138     BoogieDeclarations]: Found implementation of procedure INV_REC_g^g_PRE
[2025-04-28 21:21:17,634 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration
[2025-04-28 21:21:17,634 INFO  L130     BoogieDeclarations]: Found specification of procedure Ultimate.START
[2025-04-28 21:21:17,634 INFO  L138     BoogieDeclarations]: Found implementation of procedure Ultimate.START
[2025-04-28 21:21:17,693 INFO  L234             CfgBuilder]: Building ICFG
[2025-04-28 21:21:17,696 INFO  L260             CfgBuilder]: Building CFG for each procedure with an implementation
[2025-04-28 21:21:17,919 INFO  L?                        ?]: Removed 0 outVars from TransFormulas that were not future-live.
[2025-04-28 21:21:17,920 INFO  L283             CfgBuilder]: Performing block encoding
[2025-04-28 21:21:17,935 INFO  L304             CfgBuilder]: Using library mode
[2025-04-28 21:21:17,935 INFO  L312             CfgBuilder]: Removed 0 assume(true) statements.
[2025-04-28 21:21:17,936 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:17 BoogieIcfgContainer
[2025-04-28 21:21:17,936 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2025-04-28 21:21:17,939 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2025-04-28 21:21:17,942 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2025-04-28 21:21:17,946 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2025-04-28 21:21:17,946 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:17" (1/3) ...
[2025-04-28 21:21:17,947 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32d7fd75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 28.04 09:21:17, skipping insertion in model container
[2025-04-28 21:21:17,947 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:17" (2/3) ...
[2025-04-28 21:21:17,947 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32d7fd75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.04 09:21:17, skipping insertion in model container
[2025-04-28 21:21:17,948 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:17" (3/3) ...
[2025-04-28 21:21:17,949 INFO  L128   eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver
[2025-04-28 21:21:17,967 INFO  L217   ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2025-04-28 21:21:17,970 INFO  L151   ceAbstractionStarter]: Applying trace abstraction to ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver that has 8 procedures, 45 locations, 85 edges, 8 initial locations, 0 loop locations, and 1 error locations.
[2025-04-28 21:21:18,013 INFO  L339      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2025-04-28 21:21:18,030 INFO  L340      AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=None, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@c3eb1f2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2025-04-28 21:21:18,030 INFO  L341      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2025-04-28 21:21:18,035 INFO  L278                IsEmpty]: Start isEmpty. Operand  has 45 states, 16 states have (on average 1.5625) internal successors, (25), 25 states have internal predecessors, (25), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 13 states have call predecessors, (20), 20 states have call successors, (20)
[2025-04-28 21:21:18,049 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2025-04-28 21:21:18,049 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:18,049 INFO  L218           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:18,050 INFO  L403      AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:18,054 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:18,054 INFO  L85        PathProgramCache]: Analyzing trace with hash -2081032096, now seen corresponding path program 1 times
[2025-04-28 21:21:18,063 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:18,063 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199359881]
[2025-04-28 21:21:18,063 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:18,064 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:18,099 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 13 statements into 1 equivalence classes.
[2025-04-28 21:21:18,117 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 13 of 13 statements.
[2025-04-28 21:21:18,118 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:18,118 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:18,366 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2025-04-28 21:21:18,367 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:18,367 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199359881]
[2025-04-28 21:21:18,368 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199359881] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:18,370 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:18,373 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2025-04-28 21:21:18,375 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368582796]
[2025-04-28 21:21:18,377 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:18,383 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 6 states
[2025-04-28 21:21:18,383 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:18,411 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2025-04-28 21:21:18,412 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2025-04-28 21:21:18,414 INFO  L87              Difference]: Start difference. First operand  has 45 states, 16 states have (on average 1.5625) internal successors, (25), 25 states have internal predecessors, (25), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 13 states have call predecessors, (20), 20 states have call successors, (20) Second operand  has 6 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2025-04-28 21:21:18,617 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:18,618 INFO  L93              Difference]: Finished difference Result 49 states and 76 transitions.
[2025-04-28 21:21:18,619 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2025-04-28 21:21:18,620 INFO  L79                 Accepts]: Start accepts. Automaton has  has 6 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 13
[2025-04-28 21:21:18,621 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:18,633 INFO  L225             Difference]: With dead ends: 49
[2025-04-28 21:21:18,635 INFO  L226             Difference]: Without dead ends: 49
[2025-04-28 21:21:18,639 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2025-04-28 21:21:18,645 INFO  L437           NwaCegarLoop]: 55 mSDtfsCounter, 3 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:18,648 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 252 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:18,662 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 49 states.
[2025-04-28 21:21:18,686 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47.
[2025-04-28 21:21:18,687 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 47 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 25 states have internal predecessors, (25), 20 states have call successors, (20), 7 states have call predecessors, (20), 9 states have return successors, (28), 14 states have call predecessors, (28), 20 states have call successors, (28)
[2025-04-28 21:21:18,692 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 73 transitions.
[2025-04-28 21:21:18,693 INFO  L79                 Accepts]: Start accepts. Automaton has 47 states and 73 transitions. Word has length 13
[2025-04-28 21:21:18,694 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:18,694 INFO  L485      AbstractCegarLoop]: Abstraction has 47 states and 73 transitions.
[2025-04-28 21:21:18,694 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 6 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3)
[2025-04-28 21:21:18,694 INFO  L278                IsEmpty]: Start isEmpty. Operand 47 states and 73 transitions.
[2025-04-28 21:21:18,697 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2025-04-28 21:21:18,697 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:18,697 INFO  L218           NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:18,698 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2025-04-28 21:21:18,698 INFO  L403      AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:18,698 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:18,698 INFO  L85        PathProgramCache]: Analyzing trace with hash -1235427132, now seen corresponding path program 1 times
[2025-04-28 21:21:18,699 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:18,699 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766687249]
[2025-04-28 21:21:18,699 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:18,699 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:18,709 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 17 statements into 1 equivalence classes.
[2025-04-28 21:21:18,721 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 17 of 17 statements.
[2025-04-28 21:21:18,721 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:18,722 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:18,971 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2025-04-28 21:21:18,971 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:18,971 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766687249]
[2025-04-28 21:21:18,971 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766687249] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:18,971 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:18,972 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2025-04-28 21:21:18,972 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121373856]
[2025-04-28 21:21:18,972 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:18,973 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2025-04-28 21:21:18,973 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:18,974 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2025-04-28 21:21:18,974 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42
[2025-04-28 21:21:18,974 INFO  L87              Difference]: Start difference. First operand 47 states and 73 transitions. Second operand  has 7 states, 5 states have (on average 1.8) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:19,211 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:19,211 INFO  L93              Difference]: Finished difference Result 52 states and 83 transitions.
[2025-04-28 21:21:19,212 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2025-04-28 21:21:19,212 INFO  L79                 Accepts]: Start accepts. Automaton has  has 7 states, 5 states have (on average 1.8) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 17
[2025-04-28 21:21:19,212 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:19,214 INFO  L225             Difference]: With dead ends: 52
[2025-04-28 21:21:19,214 INFO  L226             Difference]: Without dead ends: 52
[2025-04-28 21:21:19,214 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2025-04-28 21:21:19,215 INFO  L437           NwaCegarLoop]: 63 mSDtfsCounter, 2 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:19,216 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 276 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2025-04-28 21:21:19,219 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 52 states.
[2025-04-28 21:21:19,232 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50.
[2025-04-28 21:21:19,233 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 50 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 25 states have internal predecessors, (25), 23 states have call successors, (23), 7 states have call predecessors, (23), 9 states have return successors, (32), 17 states have call predecessors, (32), 23 states have call successors, (32)
[2025-04-28 21:21:19,234 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 80 transitions.
[2025-04-28 21:21:19,235 INFO  L79                 Accepts]: Start accepts. Automaton has 50 states and 80 transitions. Word has length 17
[2025-04-28 21:21:19,237 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:19,237 INFO  L485      AbstractCegarLoop]: Abstraction has 50 states and 80 transitions.
[2025-04-28 21:21:19,237 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 5 states have (on average 1.8) internal successors, (9), 7 states have internal predecessors, (9), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:19,238 INFO  L278                IsEmpty]: Start isEmpty. Operand 50 states and 80 transitions.
[2025-04-28 21:21:19,241 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2025-04-28 21:21:19,241 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:19,241 INFO  L218           NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:19,241 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2025-04-28 21:21:19,242 INFO  L403      AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:19,242 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:19,242 INFO  L85        PathProgramCache]: Analyzing trace with hash -891300013, now seen corresponding path program 1 times
[2025-04-28 21:21:19,243 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:19,243 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320745177]
[2025-04-28 21:21:19,243 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:19,243 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:19,250 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes.
[2025-04-28 21:21:19,259 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:21:19,259 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:19,260 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:19,444 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2025-04-28 21:21:19,444 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:19,444 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320745177]
[2025-04-28 21:21:19,445 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320745177] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:19,446 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776945403]
[2025-04-28 21:21:19,446 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:19,446 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:19,449 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:19,457 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:19,458 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2025-04-28 21:21:19,541 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes.
[2025-04-28 21:21:19,565 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:21:19,565 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:19,565 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:19,567 INFO  L256         TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:19,573 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:19,674 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2025-04-28 21:21:19,674 INFO  L308         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2025-04-28 21:21:19,675 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [776945403] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:19,675 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2025-04-28 21:21:19,675 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 9
[2025-04-28 21:21:19,675 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324890641]
[2025-04-28 21:21:19,675 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:19,675 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2025-04-28 21:21:19,675 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:19,677 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2025-04-28 21:21:19,677 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2025-04-28 21:21:19,677 INFO  L87              Difference]: Start difference. First operand 50 states and 80 transitions. Second operand  has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5)
[2025-04-28 21:21:19,887 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:19,887 INFO  L93              Difference]: Finished difference Result 60 states and 96 transitions.
[2025-04-28 21:21:19,887 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2025-04-28 21:21:19,888 INFO  L79                 Accepts]: Start accepts. Automaton has  has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 21
[2025-04-28 21:21:19,888 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:19,889 INFO  L225             Difference]: With dead ends: 60
[2025-04-28 21:21:19,889 INFO  L226             Difference]: Without dead ends: 54
[2025-04-28 21:21:19,890 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110
[2025-04-28 21:21:19,891 INFO  L437           NwaCegarLoop]: 57 mSDtfsCounter, 3 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:19,891 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 303 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2025-04-28 21:21:19,892 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 54 states.
[2025-04-28 21:21:19,898 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50.
[2025-04-28 21:21:19,899 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 50 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 25 states have internal predecessors, (25), 23 states have call successors, (23), 7 states have call predecessors, (23), 9 states have return successors, (29), 17 states have call predecessors, (29), 23 states have call successors, (29)
[2025-04-28 21:21:19,900 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 77 transitions.
[2025-04-28 21:21:19,900 INFO  L79                 Accepts]: Start accepts. Automaton has 50 states and 77 transitions. Word has length 21
[2025-04-28 21:21:19,900 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:19,900 INFO  L485      AbstractCegarLoop]: Abstraction has 50 states and 77 transitions.
[2025-04-28 21:21:19,901 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 3 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5)
[2025-04-28 21:21:19,901 INFO  L278                IsEmpty]: Start isEmpty. Operand 50 states and 77 transitions.
[2025-04-28 21:21:19,902 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2025-04-28 21:21:19,902 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:19,903 INFO  L218           NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:19,908 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0
[2025-04-28 21:21:20,107 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:20,108 INFO  L403      AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:20,108 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:20,109 INFO  L85        PathProgramCache]: Analyzing trace with hash 1461478455, now seen corresponding path program 1 times
[2025-04-28 21:21:20,109 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:20,109 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632971195]
[2025-04-28 21:21:20,109 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:20,109 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:20,118 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes.
[2025-04-28 21:21:20,136 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements.
[2025-04-28 21:21:20,138 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:20,138 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:20,477 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2025-04-28 21:21:20,477 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:20,478 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632971195]
[2025-04-28 21:21:20,478 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632971195] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:20,478 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461076907]
[2025-04-28 21:21:20,478 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:20,478 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:20,481 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:20,483 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:20,488 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2025-04-28 21:21:20,527 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 25 statements into 1 equivalence classes.
[2025-04-28 21:21:20,549 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 25 of 25 statements.
[2025-04-28 21:21:20,549 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:20,549 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:20,551 INFO  L256         TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 29 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:20,553 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:20,721 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2025-04-28 21:21:20,722 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:21,366 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2025-04-28 21:21:21,366 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [461076907] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:21,366 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:21,366 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10
[2025-04-28 21:21:21,367 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001374186]
[2025-04-28 21:21:21,367 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:21,367 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 10 states
[2025-04-28 21:21:21,367 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:21,369 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2025-04-28 21:21:21,369 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90
[2025-04-28 21:21:21,370 INFO  L87              Difference]: Start difference. First operand 50 states and 77 transitions. Second operand  has 10 states, 5 states have (on average 2.8) internal successors, (14), 10 states have internal predecessors, (14), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12)
[2025-04-28 21:21:21,608 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:21,608 INFO  L93              Difference]: Finished difference Result 60 states and 88 transitions.
[2025-04-28 21:21:21,609 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2025-04-28 21:21:21,609 INFO  L79                 Accepts]: Start accepts. Automaton has  has 10 states, 5 states have (on average 2.8) internal successors, (14), 10 states have internal predecessors, (14), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) Word has length 25
[2025-04-28 21:21:21,609 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:21,611 INFO  L225             Difference]: With dead ends: 60
[2025-04-28 21:21:21,614 INFO  L226             Difference]: Without dead ends: 54
[2025-04-28 21:21:21,615 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132
[2025-04-28 21:21:21,616 INFO  L437           NwaCegarLoop]: 62 mSDtfsCounter, 7 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:21,616 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 379 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:21,617 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 54 states.
[2025-04-28 21:21:21,625 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50.
[2025-04-28 21:21:21,628 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 50 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 26 states have internal predecessors, (26), 21 states have call successors, (21), 7 states have call predecessors, (21), 10 states have return successors, (26), 16 states have call predecessors, (26), 21 states have call successors, (26)
[2025-04-28 21:21:21,630 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 73 transitions.
[2025-04-28 21:21:21,634 INFO  L79                 Accepts]: Start accepts. Automaton has 50 states and 73 transitions. Word has length 25
[2025-04-28 21:21:21,634 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:21,634 INFO  L485      AbstractCegarLoop]: Abstraction has 50 states and 73 transitions.
[2025-04-28 21:21:21,634 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 10 states, 5 states have (on average 2.8) internal successors, (14), 10 states have internal predecessors, (14), 7 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12)
[2025-04-28 21:21:21,635 INFO  L278                IsEmpty]: Start isEmpty. Operand 50 states and 73 transitions.
[2025-04-28 21:21:21,636 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2025-04-28 21:21:21,636 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:21,636 INFO  L218           NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:21,644 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0
[2025-04-28 21:21:21,839 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:21,839 INFO  L403      AbstractCegarLoop]: === Iteration 5 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:21,840 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:21,840 INFO  L85        PathProgramCache]: Analyzing trace with hash 1339565774, now seen corresponding path program 2 times
[2025-04-28 21:21:21,840 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:21,840 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522988633]
[2025-04-28 21:21:21,840 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:21,840 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:21,848 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 37 statements into 2 equivalence classes.
[2025-04-28 21:21:21,859 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:21,859 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:21,859 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:22,232 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:22,233 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:22,233 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522988633]
[2025-04-28 21:21:22,233 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522988633] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:22,233 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063228557]
[2025-04-28 21:21:22,233 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:22,233 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:22,236 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:22,238 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:22,242 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2025-04-28 21:21:22,298 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 37 statements into 2 equivalence classes.
[2025-04-28 21:21:22,331 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:22,331 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:22,331 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:22,332 INFO  L256         TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 20 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:22,336 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:22,619 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:22,620 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:24,938 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:24,938 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063228557] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:24,938 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:24,938 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24
[2025-04-28 21:21:24,938 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415852740]
[2025-04-28 21:21:24,939 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:24,939 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 24 states
[2025-04-28 21:21:24,939 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:24,940 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2025-04-28 21:21:24,940 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552
[2025-04-28 21:21:24,941 INFO  L87              Difference]: Start difference. First operand 50 states and 73 transitions. Second operand  has 24 states, 10 states have (on average 2.8) internal successors, (28), 24 states have internal predecessors, (28), 15 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (22), 15 states have call predecessors, (22), 15 states have call successors, (22)
[2025-04-28 21:21:25,581 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:25,582 INFO  L93              Difference]: Finished difference Result 69 states and 103 transitions.
[2025-04-28 21:21:25,582 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2025-04-28 21:21:25,582 INFO  L79                 Accepts]: Start accepts. Automaton has  has 24 states, 10 states have (on average 2.8) internal successors, (28), 24 states have internal predecessors, (28), 15 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (22), 15 states have call predecessors, (22), 15 states have call successors, (22) Word has length 37
[2025-04-28 21:21:25,583 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:25,584 INFO  L225             Difference]: With dead ends: 69
[2025-04-28 21:21:25,584 INFO  L226             Difference]: Without dead ends: 61
[2025-04-28 21:21:25,585 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870
[2025-04-28 21:21:25,588 INFO  L437           NwaCegarLoop]: 62 mSDtfsCounter, 11 mSDsluCounter, 714 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:25,589 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 776 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time]
[2025-04-28 21:21:25,590 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 61 states.
[2025-04-28 21:21:25,605 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55.
[2025-04-28 21:21:25,607 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 55 states, 20 states have (on average 1.4) internal successors, (28), 28 states have internal predecessors, (28), 22 states have call successors, (22), 7 states have call predecessors, (22), 12 states have return successors, (34), 19 states have call predecessors, (34), 22 states have call successors, (34)
[2025-04-28 21:21:25,608 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 84 transitions.
[2025-04-28 21:21:25,608 INFO  L79                 Accepts]: Start accepts. Automaton has 55 states and 84 transitions. Word has length 37
[2025-04-28 21:21:25,608 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:25,608 INFO  L485      AbstractCegarLoop]: Abstraction has 55 states and 84 transitions.
[2025-04-28 21:21:25,608 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 24 states, 10 states have (on average 2.8) internal successors, (28), 24 states have internal predecessors, (28), 15 states have call successors, (22), 1 states have call predecessors, (22), 10 states have return successors, (22), 15 states have call predecessors, (22), 15 states have call successors, (22)
[2025-04-28 21:21:25,609 INFO  L278                IsEmpty]: Start isEmpty. Operand 55 states and 84 transitions.
[2025-04-28 21:21:25,610 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2025-04-28 21:21:25,610 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:25,610 INFO  L218           NwaCegarLoop]: trace histogram [6, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:25,618 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0
[2025-04-28 21:21:25,814 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:25,814 INFO  L403      AbstractCegarLoop]: === Iteration 6 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:25,815 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:25,815 INFO  L85        PathProgramCache]: Analyzing trace with hash 1863717170, now seen corresponding path program 3 times
[2025-04-28 21:21:25,815 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:25,815 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611832865]
[2025-04-28 21:21:25,815 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2025-04-28 21:21:25,815 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:25,822 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 41 statements into 3 equivalence classes.
[2025-04-28 21:21:25,848 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) and asserted 41 of 41 statements.
[2025-04-28 21:21:25,848 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2025-04-28 21:21:25,848 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:26,509 INFO  L134       CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked.
[2025-04-28 21:21:26,511 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:26,511 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611832865]
[2025-04-28 21:21:26,511 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611832865] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:26,511 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008093825]
[2025-04-28 21:21:26,511 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2025-04-28 21:21:26,511 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:26,514 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:26,516 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:26,520 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2025-04-28 21:21:26,570 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 41 statements into 3 equivalence classes.
[2025-04-28 21:21:26,597 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) and asserted 41 of 41 statements.
[2025-04-28 21:21:26,597 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2025-04-28 21:21:26,597 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:26,599 INFO  L256         TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 47 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:26,601 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:26,837 INFO  L134       CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked.
[2025-04-28 21:21:26,837 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:27,796 INFO  L134       CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked.
[2025-04-28 21:21:27,796 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008093825] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:27,796 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:27,796 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 19
[2025-04-28 21:21:27,797 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144176758]
[2025-04-28 21:21:27,797 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:27,798 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 19 states
[2025-04-28 21:21:27,798 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:27,799 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2025-04-28 21:21:27,799 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342
[2025-04-28 21:21:27,803 INFO  L87              Difference]: Start difference. First operand 55 states and 84 transitions. Second operand  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 19 states have internal predecessors, (23), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (20), 15 states have call predecessors, (20), 12 states have call successors, (20)
[2025-04-28 21:21:28,425 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:28,425 INFO  L93              Difference]: Finished difference Result 71 states and 102 transitions.
[2025-04-28 21:21:28,425 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2025-04-28 21:21:28,425 INFO  L79                 Accepts]: Start accepts. Automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 19 states have internal predecessors, (23), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (20), 15 states have call predecessors, (20), 12 states have call successors, (20) Word has length 41
[2025-04-28 21:21:28,426 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:28,427 INFO  L225             Difference]: With dead ends: 71
[2025-04-28 21:21:28,427 INFO  L226             Difference]: Without dead ends: 65
[2025-04-28 21:21:28,427 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650
[2025-04-28 21:21:28,428 INFO  L437           NwaCegarLoop]: 61 mSDtfsCounter, 7 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 724 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:28,428 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 724 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2025-04-28 21:21:28,434 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 65 states.
[2025-04-28 21:21:28,447 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61.
[2025-04-28 21:21:28,447 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 61 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 31 states have internal predecessors, (31), 22 states have call successors, (22), 7 states have call predecessors, (22), 15 states have return successors, (37), 22 states have call predecessors, (37), 22 states have call successors, (37)
[2025-04-28 21:21:28,448 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 90 transitions.
[2025-04-28 21:21:28,449 INFO  L79                 Accepts]: Start accepts. Automaton has 61 states and 90 transitions. Word has length 41
[2025-04-28 21:21:28,449 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:28,449 INFO  L485      AbstractCegarLoop]: Abstraction has 61 states and 90 transitions.
[2025-04-28 21:21:28,449 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 19 states have internal predecessors, (23), 12 states have call successors, (19), 1 states have call predecessors, (19), 9 states have return successors, (20), 15 states have call predecessors, (20), 12 states have call successors, (20)
[2025-04-28 21:21:28,449 INFO  L278                IsEmpty]: Start isEmpty. Operand 61 states and 90 transitions.
[2025-04-28 21:21:28,451 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2025-04-28 21:21:28,451 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:28,451 INFO  L218           NwaCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:28,456 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0
[2025-04-28 21:21:28,651 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:28,652 INFO  L403      AbstractCegarLoop]: === Iteration 7 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:28,652 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:28,652 INFO  L85        PathProgramCache]: Analyzing trace with hash -1458668691, now seen corresponding path program 1 times
[2025-04-28 21:21:28,652 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:28,652 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571979756]
[2025-04-28 21:21:28,652 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:28,652 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:28,659 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 37 statements into 1 equivalence classes.
[2025-04-28 21:21:28,666 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:28,666 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:28,666 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:28,768 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:28,768 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:28,768 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571979756]
[2025-04-28 21:21:28,768 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571979756] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:28,768 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792015839]
[2025-04-28 21:21:28,768 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:28,768 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:28,771 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:28,774 INFO  L229       MonitoredProcess]: Starting monitored process 6 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:28,778 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process
[2025-04-28 21:21:28,835 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 37 statements into 1 equivalence classes.
[2025-04-28 21:21:28,860 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:28,861 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:28,861 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:28,862 INFO  L256         TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 9 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:28,864 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:28,973 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:28,976 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:29,420 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:29,420 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792015839] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:29,420 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:29,420 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12
[2025-04-28 21:21:29,420 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98737760]
[2025-04-28 21:21:29,421 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:29,421 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 12 states
[2025-04-28 21:21:29,421 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:29,422 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2025-04-28 21:21:29,422 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132
[2025-04-28 21:21:29,422 INFO  L87              Difference]: Start difference. First operand 61 states and 90 transitions. Second operand  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17)
[2025-04-28 21:21:29,528 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:29,528 INFO  L93              Difference]: Finished difference Result 73 states and 104 transitions.
[2025-04-28 21:21:29,528 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2025-04-28 21:21:29,529 INFO  L79                 Accepts]: Start accepts. Automaton has  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17) Word has length 37
[2025-04-28 21:21:29,529 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:29,530 INFO  L225             Difference]: With dead ends: 73
[2025-04-28 21:21:29,530 INFO  L226             Difference]: Without dead ends: 47
[2025-04-28 21:21:29,530 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182
[2025-04-28 21:21:29,531 INFO  L437           NwaCegarLoop]: 63 mSDtfsCounter, 6 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:29,531 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 339 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:29,536 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 47 states.
[2025-04-28 21:21:29,544 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45.
[2025-04-28 21:21:29,545 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 45 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 23 states have internal predecessors, (23), 14 states have call successors, (14), 5 states have call predecessors, (14), 12 states have return successors, (25), 16 states have call predecessors, (25), 14 states have call successors, (25)
[2025-04-28 21:21:29,545 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 62 transitions.
[2025-04-28 21:21:29,545 INFO  L79                 Accepts]: Start accepts. Automaton has 45 states and 62 transitions. Word has length 37
[2025-04-28 21:21:29,545 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:29,546 INFO  L485      AbstractCegarLoop]: Abstraction has 45 states and 62 transitions.
[2025-04-28 21:21:29,546 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17)
[2025-04-28 21:21:29,546 INFO  L278                IsEmpty]: Start isEmpty. Operand 45 states and 62 transitions.
[2025-04-28 21:21:29,546 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2025-04-28 21:21:29,547 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:29,547 INFO  L218           NwaCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:29,555 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0
[2025-04-28 21:21:29,750 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:29,750 INFO  L403      AbstractCegarLoop]: === Iteration 8 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:29,751 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:29,751 INFO  L85        PathProgramCache]: Analyzing trace with hash 370802372, now seen corresponding path program 1 times
[2025-04-28 21:21:29,751 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:29,751 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693372022]
[2025-04-28 21:21:29,751 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:29,751 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:29,755 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 37 statements into 1 equivalence classes.
[2025-04-28 21:21:29,760 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:29,760 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:29,760 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:29,846 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:29,846 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:29,846 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693372022]
[2025-04-28 21:21:29,846 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693372022] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:29,846 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205186779]
[2025-04-28 21:21:29,846 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:29,846 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:29,849 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:29,851 INFO  L229       MonitoredProcess]: Starting monitored process 7 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:29,854 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process
[2025-04-28 21:21:29,907 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 37 statements into 1 equivalence classes.
[2025-04-28 21:21:29,929 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 37 of 37 statements.
[2025-04-28 21:21:29,929 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:29,929 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:29,930 INFO  L256         TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 9 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:29,932 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:30,023 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:30,024 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:30,482 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2025-04-28 21:21:30,483 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205186779] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:30,483 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:30,484 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12
[2025-04-28 21:21:30,484 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996688216]
[2025-04-28 21:21:30,484 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:30,485 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 12 states
[2025-04-28 21:21:30,485 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:30,486 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2025-04-28 21:21:30,486 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132
[2025-04-28 21:21:30,486 INFO  L87              Difference]: Start difference. First operand 45 states and 62 transitions. Second operand  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17)
[2025-04-28 21:21:30,588 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:30,588 INFO  L93              Difference]: Finished difference Result 55 states and 73 transitions.
[2025-04-28 21:21:30,589 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2025-04-28 21:21:30,589 INFO  L79                 Accepts]: Start accepts. Automaton has  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17) Word has length 37
[2025-04-28 21:21:30,589 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:30,591 INFO  L225             Difference]: With dead ends: 55
[2025-04-28 21:21:30,592 INFO  L226             Difference]: Without dead ends: 32
[2025-04-28 21:21:30,592 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182
[2025-04-28 21:21:30,593 INFO  L437           NwaCegarLoop]: 42 mSDtfsCounter, 8 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:30,593 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 151 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:30,595 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 32 states.
[2025-04-28 21:21:30,598 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32.
[2025-04-28 21:21:30,601 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 32 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 16 states have internal predecessors, (16), 7 states have call successors, (7), 3 states have call predecessors, (7), 10 states have return successors, (15), 12 states have call predecessors, (15), 7 states have call successors, (15)
[2025-04-28 21:21:30,602 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions.
[2025-04-28 21:21:30,602 INFO  L79                 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 37
[2025-04-28 21:21:30,602 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:30,602 INFO  L485      AbstractCegarLoop]: Abstraction has 32 states and 38 transitions.
[2025-04-28 21:21:30,603 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 12 states, 6 states have (on average 3.5) internal successors, (21), 12 states have internal predecessors, (21), 9 states have call successors, (17), 1 states have call predecessors, (17), 6 states have return successors, (17), 9 states have call predecessors, (17), 9 states have call successors, (17)
[2025-04-28 21:21:30,603 INFO  L278                IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions.
[2025-04-28 21:21:30,605 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 90
[2025-04-28 21:21:30,605 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:30,605 INFO  L218           NwaCegarLoop]: trace histogram [15, 9, 9, 9, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:30,611 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0
[2025-04-28 21:21:30,809 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:30,810 INFO  L403      AbstractCegarLoop]: === Iteration 9 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:30,811 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:30,811 INFO  L85        PathProgramCache]: Analyzing trace with hash 1023108515, now seen corresponding path program 4 times
[2025-04-28 21:21:30,811 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:30,811 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679813764]
[2025-04-28 21:21:30,811 INFO  L95    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2025-04-28 21:21:30,812 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:30,823 INFO  L108    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST partitioned 89 statements into 2 equivalence classes.
[2025-04-28 21:21:30,870 INFO  L111    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) and asserted 89 of 89 statements.
[2025-04-28 21:21:30,870 INFO  L114    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s)
[2025-04-28 21:21:30,870 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:31,697 INFO  L134       CoverageAnalysis]: Checked inductivity of 416 backedges. 90 proven. 53 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked.
[2025-04-28 21:21:31,698 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:31,698 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679813764]
[2025-04-28 21:21:31,698 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679813764] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:31,698 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258617917]
[2025-04-28 21:21:31,698 INFO  L95    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2025-04-28 21:21:31,698 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:31,701 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:31,703 INFO  L229       MonitoredProcess]: Starting monitored process 8 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:31,709 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process
[2025-04-28 21:21:31,784 INFO  L108    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST partitioned 89 statements into 2 equivalence classes.
[2025-04-28 21:21:31,844 INFO  L111    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s) and asserted 89 of 89 statements.
[2025-04-28 21:21:31,845 INFO  L114    AnnotateAndAsserter]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 1 check-sat command(s)
[2025-04-28 21:21:31,845 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:31,848 INFO  L256         TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 32 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:31,854 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:32,397 INFO  L134       CoverageAnalysis]: Checked inductivity of 416 backedges. 62 proven. 79 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked.
[2025-04-28 21:21:32,397 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:38,675 INFO  L134       CoverageAnalysis]: Checked inductivity of 416 backedges. 58 proven. 83 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked.
[2025-04-28 21:21:38,675 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258617917] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:38,675 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:38,675 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16, 16] total 37
[2025-04-28 21:21:38,675 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934206692]
[2025-04-28 21:21:38,675 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:38,676 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 37 states
[2025-04-28 21:21:38,676 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:38,677 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants.
[2025-04-28 21:21:38,677 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1220, Unknown=0, NotChecked=0, Total=1332
[2025-04-28 21:21:38,678 INFO  L87              Difference]: Start difference. First operand 32 states and 38 transitions. Second operand  has 37 states, 15 states have (on average 2.933333333333333) internal successors, (44), 37 states have internal predecessors, (44), 24 states have call successors, (39), 1 states have call predecessors, (39), 15 states have return successors, (39), 25 states have call predecessors, (39), 24 states have call successors, (39)
[2025-04-28 21:21:40,924 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:40,925 INFO  L93              Difference]: Finished difference Result 105 states and 154 transitions.
[2025-04-28 21:21:40,925 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. 
[2025-04-28 21:21:40,926 INFO  L79                 Accepts]: Start accepts. Automaton has  has 37 states, 15 states have (on average 2.933333333333333) internal successors, (44), 37 states have internal predecessors, (44), 24 states have call successors, (39), 1 states have call predecessors, (39), 15 states have return successors, (39), 25 states have call predecessors, (39), 24 states have call successors, (39) Word has length 89
[2025-04-28 21:21:40,926 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:40,927 INFO  L225             Difference]: With dead ends: 105
[2025-04-28 21:21:40,927 INFO  L226             Difference]: Without dead ends: 45
[2025-04-28 21:21:40,928 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 159 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=760, Invalid=3022, Unknown=0, NotChecked=0, Total=3782
[2025-04-28 21:21:40,929 INFO  L437           NwaCegarLoop]: 38 mSDtfsCounter, 28 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 884 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:40,929 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 554 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 884 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time]
[2025-04-28 21:21:40,930 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 45 states.
[2025-04-28 21:21:40,935 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41.
[2025-04-28 21:21:40,935 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 41 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 8 states have call successors, (8), 3 states have call predecessors, (8), 14 states have return successors, (26), 17 states have call predecessors, (26), 8 states have call successors, (26)
[2025-04-28 21:21:40,936 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 54 transitions.
[2025-04-28 21:21:40,936 INFO  L79                 Accepts]: Start accepts. Automaton has 41 states and 54 transitions. Word has length 89
[2025-04-28 21:21:40,937 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:40,937 INFO  L485      AbstractCegarLoop]: Abstraction has 41 states and 54 transitions.
[2025-04-28 21:21:40,937 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 37 states, 15 states have (on average 2.933333333333333) internal successors, (44), 37 states have internal predecessors, (44), 24 states have call successors, (39), 1 states have call predecessors, (39), 15 states have return successors, (39), 25 states have call predecessors, (39), 24 states have call successors, (39)
[2025-04-28 21:21:40,937 INFO  L278                IsEmpty]: Start isEmpty. Operand 41 states and 54 transitions.
[2025-04-28 21:21:40,938 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 98
[2025-04-28 21:21:40,938 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:40,938 INFO  L218           NwaCegarLoop]: trace histogram [17, 11, 11, 11, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:40,945 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0
[2025-04-28 21:21:41,139 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9
[2025-04-28 21:21:41,139 INFO  L403      AbstractCegarLoop]: === Iteration 10 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:41,139 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:41,139 INFO  L85        PathProgramCache]: Analyzing trace with hash 1241650411, now seen corresponding path program 5 times
[2025-04-28 21:21:41,139 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:41,139 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43499073]
[2025-04-28 21:21:41,139 INFO  L95    rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1
[2025-04-28 21:21:41,140 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:41,149 INFO  L108    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 partitioned 97 statements into 9 equivalence classes.
[2025-04-28 21:21:41,160 INFO  L111    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) and asserted 32 of 97 statements.
[2025-04-28 21:21:41,160 INFO  L114    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s)
[2025-04-28 21:21:41,160 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:41,582 INFO  L134       CoverageAnalysis]: Checked inductivity of 528 backedges. 37 proven. 192 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked.
[2025-04-28 21:21:41,582 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:41,583 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43499073]
[2025-04-28 21:21:41,583 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43499073] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:41,583 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986233667]
[2025-04-28 21:21:41,583 INFO  L95    rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1
[2025-04-28 21:21:41,583 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:41,585 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:41,588 INFO  L229       MonitoredProcess]: Starting monitored process 9 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:41,592 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process
[2025-04-28 21:21:41,701 INFO  L108    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 partitioned 97 statements into 9 equivalence classes.
[2025-04-28 21:21:41,728 INFO  L111    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) and asserted 32 of 97 statements.
[2025-04-28 21:21:41,728 INFO  L114    AnnotateAndAsserter]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s)
[2025-04-28 21:21:41,728 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:41,730 INFO  L256         TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 32 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:41,733 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:42,163 INFO  L134       CoverageAnalysis]: Checked inductivity of 528 backedges. 38 proven. 194 refuted. 0 times theorem prover too weak. 296 trivial. 0 not checked.
[2025-04-28 21:21:42,165 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:45,454 INFO  L134       CoverageAnalysis]: Checked inductivity of 528 backedges. 38 proven. 194 refuted. 0 times theorem prover too weak. 296 trivial. 0 not checked.
[2025-04-28 21:21:45,454 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [986233667] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:45,454 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:45,455 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 34
[2025-04-28 21:21:45,455 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008940745]
[2025-04-28 21:21:45,455 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:45,455 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 34 states
[2025-04-28 21:21:45,455 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:45,456 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants.
[2025-04-28 21:21:45,456 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1033, Unknown=0, NotChecked=0, Total=1122
[2025-04-28 21:21:45,457 INFO  L87              Difference]: Start difference. First operand 41 states and 54 transitions. Second operand  has 34 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 31 states have internal predecessors, (43), 23 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (30), 13 states have call predecessors, (30), 23 states have call successors, (30)
[2025-04-28 21:21:46,090 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:46,090 INFO  L93              Difference]: Finished difference Result 58 states and 85 transitions.
[2025-04-28 21:21:46,091 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2025-04-28 21:21:46,091 INFO  L79                 Accepts]: Start accepts. Automaton has  has 34 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 31 states have internal predecessors, (43), 23 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (30), 13 states have call predecessors, (30), 23 states have call successors, (30) Word has length 97
[2025-04-28 21:21:46,091 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:46,092 INFO  L225             Difference]: With dead ends: 58
[2025-04-28 21:21:46,092 INFO  L226             Difference]: Without dead ends: 58
[2025-04-28 21:21:46,093 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 171 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=187, Invalid=1535, Unknown=0, NotChecked=0, Total=1722
[2025-04-28 21:21:46,093 INFO  L437           NwaCegarLoop]: 22 mSDtfsCounter, 27 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:46,094 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 369 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2025-04-28 21:21:46,094 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 58 states.
[2025-04-28 21:21:46,101 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50.
[2025-04-28 21:21:46,101 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 50 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 24 states have internal predecessors, (24), 9 states have call successors, (9), 3 states have call predecessors, (9), 18 states have return successors, (40), 22 states have call predecessors, (40), 9 states have call successors, (40)
[2025-04-28 21:21:46,102 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 73 transitions.
[2025-04-28 21:21:46,102 INFO  L79                 Accepts]: Start accepts. Automaton has 50 states and 73 transitions. Word has length 97
[2025-04-28 21:21:46,102 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:46,102 INFO  L485      AbstractCegarLoop]: Abstraction has 50 states and 73 transitions.
[2025-04-28 21:21:46,103 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 34 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 31 states have internal predecessors, (43), 23 states have call successors, (28), 1 states have call predecessors, (28), 14 states have return successors, (30), 13 states have call predecessors, (30), 23 states have call successors, (30)
[2025-04-28 21:21:46,103 INFO  L278                IsEmpty]: Start isEmpty. Operand 50 states and 73 transitions.
[2025-04-28 21:21:46,104 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 82
[2025-04-28 21:21:46,104 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:46,104 INFO  L218           NwaCegarLoop]: trace histogram [13, 7, 7, 7, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:46,113 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0
[2025-04-28 21:21:46,308 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:46,308 INFO  L403      AbstractCegarLoop]: === Iteration 11 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:46,309 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:46,309 INFO  L85        PathProgramCache]: Analyzing trace with hash 569250267, now seen corresponding path program 6 times
[2025-04-28 21:21:46,309 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:46,309 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326952039]
[2025-04-28 21:21:46,309 INFO  L95    rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE
[2025-04-28 21:21:46,309 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:46,317 INFO  L108    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE partitioned 81 statements into 8 equivalence classes.
[2025-04-28 21:21:46,330 INFO  L111    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) and asserted 61 of 81 statements.
[2025-04-28 21:21:46,330 INFO  L114    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s)
[2025-04-28 21:21:46,330 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:46,569 INFO  L134       CoverageAnalysis]: Checked inductivity of 320 backedges. 31 proven. 61 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked.
[2025-04-28 21:21:46,570 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:46,570 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326952039]
[2025-04-28 21:21:46,570 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326952039] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:46,570 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899718146]
[2025-04-28 21:21:46,570 INFO  L95    rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE
[2025-04-28 21:21:46,570 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:46,573 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:46,575 INFO  L229       MonitoredProcess]: Starting monitored process 10 with /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2025-04-28 21:21:46,580 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process
[2025-04-28 21:21:46,710 INFO  L108    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE partitioned 81 statements into 8 equivalence classes.
[2025-04-28 21:21:46,753 INFO  L111    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) and asserted 61 of 81 statements.
[2025-04-28 21:21:46,753 INFO  L114    AnnotateAndAsserter]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s)
[2025-04-28 21:21:46,753 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:46,755 INFO  L256         TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 22 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:46,757 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:46,964 INFO  L134       CoverageAnalysis]: Checked inductivity of 320 backedges. 31 proven. 63 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked.
[2025-04-28 21:21:46,964 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
