./chc-comp-wrapper.sh ../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-071.smt2 .


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This is Ultimate 0.3.0-dev-42d8767-m
[2025-04-28 21:21:17,117 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2025-04-28 21:21:17,231 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9463a9a9-a790-4464-a069-dfc850b60043/chc-comp25-scripts/participants/UltimateUnihorn/./chccomp-Unihorn_Default.epf
[2025-04-28 21:21:17,238 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2025-04-28 21:21:17,239 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2025-04-28 21:21:17,280 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2025-04-28 21:21:17,282 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2025-04-28 21:21:17,282 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2025-04-28 21:21:17,283 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2025-04-28 21:21:17,284 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2025-04-28 21:21:17,284 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2025-04-28 21:21:17,285 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2025-04-28 21:21:17,286 INFO  L153        SettingsManager]:  * Use SBE=true
[2025-04-28 21:21:17,286 INFO  L151        SettingsManager]: Preferences of ChcToBoogie differ from their defaults:
[2025-04-28 21:21:17,286 INFO  L153        SettingsManager]:  * Use one large procedure with gotos to replace tail recursive calls=false
[2025-04-28 21:21:17,286 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2025-04-28 21:21:17,287 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2025-04-28 21:21:17,287 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2025-04-28 21:21:17,287 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:17,288 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2025-04-28 21:21:17,288 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2025-04-28 21:21:17,288 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2025-04-28 21:21:17,288 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2025-04-28 21:21:17,288 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2025-04-28 21:21:17,288 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2025-04-28 21:21:17,289 INFO  L151        SettingsManager]: Preferences of SmtParser differ from their defaults:
[2025-04-28 21:21:17,289 INFO  L153        SettingsManager]:  * SmtParser Mode=UltimateTreeAutomizer
[2025-04-28 21:21:17,672 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2025-04-28 21:21:17,685 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2025-04-28 21:21:17,687 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2025-04-28 21:21:17,691 INFO  L270        PluginConnector]: Initializing SmtParser...
[2025-04-28 21:21:17,691 INFO  L274        PluginConnector]: SmtParser initialized
[2025-04-28 21:21:17,694 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9463a9a9-a790-4464-a069-dfc850b60043/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-071.smt2
[2025-04-28 21:21:17,695 INFO  L314              SmtParser]: Parsing .smt2 file as a set of Horn Clauses
[2025-04-28 21:21:17,704 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
unknown
[2025-04-28 21:21:18,120 INFO  L339              SmtParser]: Successfully executed SMT file /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9463a9a9-a790-4464-a069-dfc850b60043/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA-Arrays/chc-comp24-LIA-Arrays-071.smt2
[2025-04-28 21:21:18,127 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2025-04-28 21:21:18,132 INFO  L133        ToolchainWalker]: Walking toolchain with 4 elements.
[2025-04-28 21:21:18,133 INFO  L112        PluginConnector]: ------------------------ChcToBoogie----------------------------
[2025-04-28 21:21:18,135 INFO  L270        PluginConnector]: Initializing ChcToBoogie...
[2025-04-28 21:21:18,135 INFO  L274        PluginConnector]: ChcToBoogie initialized
[2025-04-28 21:21:18,138 INFO  L184        PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,195 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18 Unit
[2025-04-28 21:21:18,195 INFO  L131        PluginConnector]: ------------------------ END ChcToBoogie----------------------------
[2025-04-28 21:21:18,196 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2025-04-28 21:21:18,197 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2025-04-28 21:21:18,198 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2025-04-28 21:21:18,219 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,220 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,263 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,263 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,268 INFO  L184        PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,269 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,272 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,273 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,274 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,293 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2025-04-28 21:21:18,298 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2025-04-28 21:21:18,298 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2025-04-28 21:21:18,298 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2025-04-28 21:21:18,300 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (1/1) ...
[2025-04-28 21:21:18,303 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:18,321 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:18,337 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 21:21:18,342 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 21:21:18,359 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure False given in one single declaration
[2025-04-28 21:21:18,359 INFO  L130     BoogieDeclarations]: Found specification of procedure False
[2025-04-28 21:21:18,359 INFO  L138     BoogieDeclarations]: Found implementation of procedure False
[2025-04-28 21:21:18,359 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure realizable given in one single declaration
[2025-04-28 21:21:18,360 INFO  L130     BoogieDeclarations]: Found specification of procedure realizable
[2025-04-28 21:21:18,360 INFO  L138     BoogieDeclarations]: Found implementation of procedure realizable
[2025-04-28 21:21:18,360 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcStart__syn given in one single declaration
[2025-04-28 21:21:18,360 INFO  L130     BoogieDeclarations]: Found specification of procedure funcStart__syn
[2025-04-28 21:21:18,360 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcStart__syn
[2025-04-28 21:21:18,361 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcE__syn given in one single declaration
[2025-04-28 21:21:18,361 INFO  L130     BoogieDeclarations]: Found specification of procedure funcE__syn
[2025-04-28 21:21:18,361 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcE__syn
[2025-04-28 21:21:18,361 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure funcB__syn given in one single declaration
[2025-04-28 21:21:18,361 INFO  L130     BoogieDeclarations]: Found specification of procedure funcB__syn
[2025-04-28 21:21:18,363 INFO  L138     BoogieDeclarations]: Found implementation of procedure funcB__syn
[2025-04-28 21:21:18,364 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration
[2025-04-28 21:21:18,364 INFO  L130     BoogieDeclarations]: Found specification of procedure Ultimate.START
[2025-04-28 21:21:18,364 INFO  L138     BoogieDeclarations]: Found implementation of procedure Ultimate.START
[2025-04-28 21:21:18,485 INFO  L234             CfgBuilder]: Building ICFG
[2025-04-28 21:21:18,488 INFO  L260             CfgBuilder]: Building CFG for each procedure with an implementation
[2025-04-28 21:21:18,845 INFO  L?                        ?]: Removed 0 outVars from TransFormulas that were not future-live.
[2025-04-28 21:21:18,846 INFO  L283             CfgBuilder]: Performing block encoding
[2025-04-28 21:21:18,865 INFO  L304             CfgBuilder]: Using library mode
[2025-04-28 21:21:18,865 INFO  L312             CfgBuilder]: Removed 1 assume(true) statements.
[2025-04-28 21:21:18,865 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:18 BoogieIcfgContainer
[2025-04-28 21:21:18,865 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2025-04-28 21:21:18,868 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2025-04-28 21:21:18,868 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2025-04-28 21:21:18,872 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2025-04-28 21:21:18,872 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:18" (1/3) ...
[2025-04-28 21:21:18,873 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51be2505 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 28.04 09:21:18, skipping insertion in model container
[2025-04-28 21:21:18,874 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:18" (2/3) ...
[2025-04-28 21:21:18,874 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51be2505 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.04 09:21:18, skipping insertion in model container
[2025-04-28 21:21:18,874 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:18" (3/3) ...
[2025-04-28 21:21:18,876 INFO  L128   eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver
[2025-04-28 21:21:18,893 INFO  L217   ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2025-04-28 21:21:18,896 INFO  L151   ceAbstractionStarter]: Applying trace abstraction to ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver that has 6 procedures, 31 locations, 57 edges, 6 initial locations, 0 loop locations, and 1 error locations.
[2025-04-28 21:21:18,950 INFO  L339      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2025-04-28 21:21:18,966 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;@48bf478b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2025-04-28 21:21:18,967 INFO  L341      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2025-04-28 21:21:18,971 INFO  L278                IsEmpty]: Start isEmpty. Operand  has 31 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (13), 10 states have call predecessors, (13), 13 states have call successors, (13)
[2025-04-28 21:21:18,983 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2025-04-28 21:21:18,983 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:18,984 INFO  L218           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:18,984 INFO  L403      AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:18,991 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:18,992 INFO  L85        PathProgramCache]: Analyzing trace with hash -457292281, now seen corresponding path program 1 times
[2025-04-28 21:21:19,000 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:19,001 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829276335]
[2025-04-28 21:21:19,001 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:19,002 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:19,046 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes.
[2025-04-28 21:21:19,124 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements.
[2025-04-28 21:21:19,125 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:19,125 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:19,393 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 21:21:19,393 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:19,393 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829276335]
[2025-04-28 21:21:19,394 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829276335] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:19,394 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:19,397 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2025-04-28 21:21:19,399 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110808217]
[2025-04-28 21:21:19,400 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:19,404 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2025-04-28 21:21:19,404 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:19,435 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2025-04-28 21:21:19,436 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2025-04-28 21:21:19,439 INFO  L87              Difference]: Start difference. First operand  has 31 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (13), 10 states have call predecessors, (13), 13 states have call successors, (13) Second operand  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:19,516 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:19,516 INFO  L93              Difference]: Finished difference Result 31 states and 45 transitions.
[2025-04-28 21:21:19,519 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2025-04-28 21:21:19,520 INFO  L79                 Accepts]: Start accepts. Automaton has  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 16
[2025-04-28 21:21:19,520 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:19,529 INFO  L225             Difference]: With dead ends: 31
[2025-04-28 21:21:19,530 INFO  L226             Difference]: Without dead ends: 31
[2025-04-28 21:21:19,533 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2025-04-28 21:21:19,538 INFO  L437           NwaCegarLoop]: 40 mSDtfsCounter, 1 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:19,542 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 109 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2025-04-28 21:21:19,606 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2025-04-28 21:21:19,667 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31.
[2025-04-28 21:21:19,668 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 31 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 15 states have internal predecessors, (17), 13 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (15), 11 states have call predecessors, (15), 13 states have call successors, (15)
[2025-04-28 21:21:19,673 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions.
[2025-04-28 21:21:19,678 INFO  L79                 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 16
[2025-04-28 21:21:19,678 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:19,679 INFO  L485      AbstractCegarLoop]: Abstraction has 31 states and 45 transitions.
[2025-04-28 21:21:19,679 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:19,679 INFO  L278                IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions.
[2025-04-28 21:21:19,681 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2025-04-28 21:21:19,681 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:19,682 INFO  L218           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:19,682 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2025-04-28 21:21:19,682 INFO  L403      AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:19,684 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:19,685 INFO  L85        PathProgramCache]: Analyzing trace with hash -1831322155, now seen corresponding path program 1 times
[2025-04-28 21:21:19,685 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:19,685 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765798214]
[2025-04-28 21:21:19,686 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:19,686 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:19,711 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 16 statements into 1 equivalence classes.
[2025-04-28 21:21:19,761 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 16 of 16 statements.
[2025-04-28 21:21:19,764 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:19,765 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:19,931 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 21:21:19,931 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:19,932 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765798214]
[2025-04-28 21:21:19,932 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765798214] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:19,932 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:19,932 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2025-04-28 21:21:19,934 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988857145]
[2025-04-28 21:21:19,934 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:19,935 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2025-04-28 21:21:19,935 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:19,936 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2025-04-28 21:21:19,936 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2025-04-28 21:21:19,936 INFO  L87              Difference]: Start difference. First operand 31 states and 45 transitions. Second operand  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:20,025 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:20,025 INFO  L93              Difference]: Finished difference Result 35 states and 51 transitions.
[2025-04-28 21:21:20,027 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2025-04-28 21:21:20,028 INFO  L79                 Accepts]: Start accepts. Automaton has  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 16
[2025-04-28 21:21:20,028 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:20,029 INFO  L225             Difference]: With dead ends: 35
[2025-04-28 21:21:20,029 INFO  L226             Difference]: Without dead ends: 35
[2025-04-28 21:21:20,030 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2025-04-28 21:21:20,031 INFO  L437           NwaCegarLoop]: 42 mSDtfsCounter, 1 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:20,033 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 115 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:20,034 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2025-04-28 21:21:20,039 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31.
[2025-04-28 21:21:20,041 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 31 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 15 states have internal predecessors, (17), 13 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (15), 11 states have call predecessors, (15), 13 states have call successors, (15)
[2025-04-28 21:21:20,043 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions.
[2025-04-28 21:21:20,044 INFO  L79                 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 16
[2025-04-28 21:21:20,044 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:20,044 INFO  L485      AbstractCegarLoop]: Abstraction has 31 states and 45 transitions.
[2025-04-28 21:21:20,045 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4)
[2025-04-28 21:21:20,045 INFO  L278                IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions.
[2025-04-28 21:21:20,047 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:20,047 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:20,047 INFO  L218           NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:20,047 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2025-04-28 21:21:20,047 INFO  L403      AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:20,048 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:20,048 INFO  L85        PathProgramCache]: Analyzing trace with hash 724366498, now seen corresponding path program 1 times
[2025-04-28 21:21:20,048 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:20,048 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344704144]
[2025-04-28 21:21:20,049 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:20,049 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:20,067 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:20,111 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:20,112 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:20,112 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:20,457 INFO  L134       CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked.
[2025-04-28 21:21:20,458 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:20,458 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344704144]
[2025-04-28 21:21:20,458 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344704144] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:20,459 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416384605]
[2025-04-28 21:21:20,459 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:20,459 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:20,463 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:20,467 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 21:21:20,469 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2025-04-28 21:21:20,569 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:20,684 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:20,684 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:20,684 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:20,688 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 10 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:20,695 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:20,813 INFO  L134       CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked.
[2025-04-28 21:21:20,813 INFO  L308         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2025-04-28 21:21:20,813 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [416384605] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:20,813 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2025-04-28 21:21:20,813 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7
[2025-04-28 21:21:20,814 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042082090]
[2025-04-28 21:21:20,814 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:20,815 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2025-04-28 21:21:20,815 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:20,816 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2025-04-28 21:21:20,816 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2025-04-28 21:21:20,816 INFO  L87              Difference]: Start difference. First operand 31 states and 45 transitions. Second operand  has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6)
[2025-04-28 21:21:20,981 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:20,981 INFO  L93              Difference]: Finished difference Result 38 states and 61 transitions.
[2025-04-28 21:21:20,983 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2025-04-28 21:21:20,983 INFO  L79                 Accepts]: Start accepts. Automaton has  has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6) Word has length 28
[2025-04-28 21:21:20,984 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:20,985 INFO  L225             Difference]: With dead ends: 38
[2025-04-28 21:21:20,985 INFO  L226             Difference]: Without dead ends: 38
[2025-04-28 21:21:20,985 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2025-04-28 21:21:20,986 INFO  L437           NwaCegarLoop]: 41 mSDtfsCounter, 3 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:20,986 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 144 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:20,989 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 38 states.
[2025-04-28 21:21:20,998 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34.
[2025-04-28 21:21:20,999 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 34 states, 12 states have (on average 1.5) internal successors, (18), 16 states have internal predecessors, (18), 14 states have call successors, (14), 5 states have call predecessors, (14), 7 states have return successors, (20), 13 states have call predecessors, (20), 14 states have call successors, (20)
[2025-04-28 21:21:21,001 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 52 transitions.
[2025-04-28 21:21:21,004 INFO  L79                 Accepts]: Start accepts. Automaton has 34 states and 52 transitions. Word has length 28
[2025-04-28 21:21:21,004 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:21,004 INFO  L485      AbstractCegarLoop]: Abstraction has 34 states and 52 transitions.
[2025-04-28 21:21:21,004 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 3 states have call predecessors, (6), 4 states have call successors, (6)
[2025-04-28 21:21:21,005 INFO  L278                IsEmpty]: Start isEmpty. Operand 34 states and 52 transitions.
[2025-04-28 21:21:21,006 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:21,007 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:21,007 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, 1, 1, 1]
[2025-04-28 21:21:21,014 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0
[2025-04-28 21:21:21,212 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:21,212 INFO  L403      AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:21,212 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:21,212 INFO  L85        PathProgramCache]: Analyzing trace with hash -1163382544, now seen corresponding path program 1 times
[2025-04-28 21:21:21,213 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:21,213 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473132870]
[2025-04-28 21:21:21,213 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:21,213 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:21,229 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:21,251 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:21,252 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:21,252 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:21,992 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:21,993 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:21,993 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473132870]
[2025-04-28 21:21:21,993 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473132870] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:21,993 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242137949]
[2025-04-28 21:21:21,994 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:21,994 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:21,997 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:22,000 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 21:21:22,003 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2025-04-28 21:21:22,097 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:22,178 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:22,178 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:22,178 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:22,181 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 16 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:22,184 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:22,525 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:22,525 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:24,510 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:24,511 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [242137949] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:24,511 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:24,511 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 19
[2025-04-28 21:21:24,511 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206812587]
[2025-04-28 21:21:24,511 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:24,512 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 19 states
[2025-04-28 21:21:24,512 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:24,513 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2025-04-28 21:21:24,513 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=300, Unknown=0, NotChecked=0, Total=342
[2025-04-28 21:21:24,513 INFO  L87              Difference]: Start difference. First operand 34 states and 52 transitions. Second operand  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:26,424 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:26,425 INFO  L93              Difference]: Finished difference Result 72 states and 237 transitions.
[2025-04-28 21:21:26,426 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2025-04-28 21:21:26,426 INFO  L79                 Accepts]: Start accepts. Automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16) Word has length 28
[2025-04-28 21:21:26,427 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:26,435 INFO  L225             Difference]: With dead ends: 72
[2025-04-28 21:21:26,437 INFO  L226             Difference]: Without dead ends: 72
[2025-04-28 21:21:26,438 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870
[2025-04-28 21:21:26,439 INFO  L437           NwaCegarLoop]: 41 mSDtfsCounter, 16 mSDsluCounter, 454 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:26,442 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 495 Invalid, 969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time]
[2025-04-28 21:21:26,442 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 72 states.
[2025-04-28 21:21:26,472 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 55.
[2025-04-28 21:21:26,472 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 55 states, 20 states have (on average 1.3) internal successors, (26), 25 states have internal predecessors, (26), 19 states have call successors, (19), 5 states have call predecessors, (19), 15 states have return successors, (99), 25 states have call predecessors, (99), 19 states have call successors, (99)
[2025-04-28 21:21:26,475 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 144 transitions.
[2025-04-28 21:21:26,475 INFO  L79                 Accepts]: Start accepts. Automaton has 55 states and 144 transitions. Word has length 28
[2025-04-28 21:21:26,476 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:26,476 INFO  L485      AbstractCegarLoop]: Abstraction has 55 states and 144 transitions.
[2025-04-28 21:21:26,476 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:26,476 INFO  L278                IsEmpty]: Start isEmpty. Operand 55 states and 144 transitions.
[2025-04-28 21:21:26,479 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:26,479 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:26,479 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, 1, 1, 1]
[2025-04-28 21:21:26,485 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0
[2025-04-28 21:21:26,684 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:26,684 INFO  L403      AbstractCegarLoop]: === Iteration 5 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:26,685 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:26,685 INFO  L85        PathProgramCache]: Analyzing trace with hash 2012618728, now seen corresponding path program 1 times
[2025-04-28 21:21:26,685 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:26,685 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217003855]
[2025-04-28 21:21:26,685 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:26,685 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:26,697 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:26,722 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:26,722 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:26,723 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:27,337 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:27,338 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:27,338 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217003855]
[2025-04-28 21:21:27,338 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217003855] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:27,338 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795596480]
[2025-04-28 21:21:27,338 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:27,338 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:27,342 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:27,344 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 21:21:27,348 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2025-04-28 21:21:27,443 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:27,522 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:27,522 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:27,522 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:27,525 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 16 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:27,528 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:27,770 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 21:21:27,770 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:29,390 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 21:21:29,390 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [795596480] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:29,390 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:29,390 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 18
[2025-04-28 21:21:29,391 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279774728]
[2025-04-28 21:21:29,391 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:29,391 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 18 states
[2025-04-28 21:21:29,391 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:29,394 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants.
[2025-04-28 21:21:29,394 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306
[2025-04-28 21:21:29,395 INFO  L87              Difference]: Start difference. First operand 55 states and 144 transitions. Second operand  has 18 states, 8 states have (on average 2.75) internal successors, (22), 15 states have internal predecessors, (22), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:30,730 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:30,731 INFO  L93              Difference]: Finished difference Result 103 states and 566 transitions.
[2025-04-28 21:21:30,731 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. 
[2025-04-28 21:21:30,732 INFO  L79                 Accepts]: Start accepts. Automaton has  has 18 states, 8 states have (on average 2.75) internal successors, (22), 15 states have internal predecessors, (22), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) Word has length 28
[2025-04-28 21:21:30,732 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:30,748 INFO  L225             Difference]: With dead ends: 103
[2025-04-28 21:21:30,751 INFO  L226             Difference]: Without dead ends: 103
[2025-04-28 21:21:30,752 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=157, Invalid=773, Unknown=0, NotChecked=0, Total=930
[2025-04-28 21:21:30,753 INFO  L437           NwaCegarLoop]: 50 mSDtfsCounter, 9 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:30,753 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 484 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time]
[2025-04-28 21:21:30,754 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 103 states.
[2025-04-28 21:21:30,846 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82.
[2025-04-28 21:21:30,848 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 82 states, 30 states have (on average 1.2) internal successors, (36), 36 states have internal predecessors, (36), 26 states have call successors, (26), 5 states have call predecessors, (26), 25 states have return successors, (311), 41 states have call predecessors, (311), 26 states have call successors, (311)
[2025-04-28 21:21:30,855 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 373 transitions.
[2025-04-28 21:21:30,855 INFO  L79                 Accepts]: Start accepts. Automaton has 82 states and 373 transitions. Word has length 28
[2025-04-28 21:21:30,856 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:30,856 INFO  L485      AbstractCegarLoop]: Abstraction has 82 states and 373 transitions.
[2025-04-28 21:21:30,856 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 18 states, 8 states have (on average 2.75) internal successors, (22), 15 states have internal predecessors, (22), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:30,856 INFO  L278                IsEmpty]: Start isEmpty. Operand 82 states and 373 transitions.
[2025-04-28 21:21:30,876 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:30,876 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:30,876 INFO  L218           NwaCegarLoop]: trace histogram [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]
[2025-04-28 21:21:30,885 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0
[2025-04-28 21:21:31,076 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:31,077 INFO  L403      AbstractCegarLoop]: === Iteration 6 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:31,077 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:31,077 INFO  L85        PathProgramCache]: Analyzing trace with hash 377321828, now seen corresponding path program 1 times
[2025-04-28 21:21:31,078 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:31,078 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060027031]
[2025-04-28 21:21:31,078 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:31,078 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:31,091 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:31,112 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:31,112 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:31,112 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:31,414 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:31,415 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:31,415 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060027031]
[2025-04-28 21:21:31,415 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060027031] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:31,415 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467113718]
[2025-04-28 21:21:31,415 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:31,415 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:31,418 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:31,421 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 21:21:31,425 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2025-04-28 21:21:31,533 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:31,617 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:31,617 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:31,617 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:31,620 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 14 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:31,622 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:31,800 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:31,800 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:33,079 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:33,079 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467113718] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:33,079 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:33,080 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12
[2025-04-28 21:21:33,080 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497657726]
[2025-04-28 21:21:33,080 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:33,080 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 12 states
[2025-04-28 21:21:33,081 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:33,081 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2025-04-28 21:21:33,082 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2025-04-28 21:21:33,082 INFO  L87              Difference]: Start difference. First operand 82 states and 373 transitions. Second operand  has 12 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 12 states have internal predecessors, (20), 9 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (13), 4 states have call predecessors, (13), 9 states have call successors, (13)
[2025-04-28 21:21:33,513 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:33,513 INFO  L93              Difference]: Finished difference Result 92 states and 475 transitions.
[2025-04-28 21:21:33,514 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2025-04-28 21:21:33,515 INFO  L79                 Accepts]: Start accepts. Automaton has  has 12 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 12 states have internal predecessors, (20), 9 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (13), 4 states have call predecessors, (13), 9 states have call successors, (13) Word has length 28
[2025-04-28 21:21:33,515 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:33,521 INFO  L225             Difference]: With dead ends: 92
[2025-04-28 21:21:33,521 INFO  L226             Difference]: Without dead ends: 92
[2025-04-28 21:21:33,522 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272
[2025-04-28 21:21:33,523 INFO  L437           NwaCegarLoop]: 43 mSDtfsCounter, 5 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:33,523 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 325 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2025-04-28 21:21:33,524 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 92 states.
[2025-04-28 21:21:33,560 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 89.
[2025-04-28 21:21:33,561 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 89 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 39 states have internal predecessors, (39), 27 states have call successors, (27), 5 states have call predecessors, (27), 28 states have return successors, (369), 44 states have call predecessors, (369), 27 states have call successors, (369)
[2025-04-28 21:21:33,565 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 435 transitions.
[2025-04-28 21:21:33,565 INFO  L79                 Accepts]: Start accepts. Automaton has 89 states and 435 transitions. Word has length 28
[2025-04-28 21:21:33,565 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:33,566 INFO  L485      AbstractCegarLoop]: Abstraction has 89 states and 435 transitions.
[2025-04-28 21:21:33,566 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 12 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 12 states have internal predecessors, (20), 9 states have call successors, (12), 1 states have call predecessors, (12), 6 states have return successors, (13), 4 states have call predecessors, (13), 9 states have call successors, (13)
[2025-04-28 21:21:33,566 INFO  L278                IsEmpty]: Start isEmpty. Operand 89 states and 435 transitions.
[2025-04-28 21:21:33,572 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:33,572 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:33,572 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, 1, 1, 1]
[2025-04-28 21:21:33,578 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0
[2025-04-28 21:21:33,776 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:33,776 INFO  L403      AbstractCegarLoop]: === Iteration 7 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:33,777 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:33,777 INFO  L85        PathProgramCache]: Analyzing trace with hash 1183187696, now seen corresponding path program 2 times
[2025-04-28 21:21:33,777 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:33,777 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465094460]
[2025-04-28 21:21:33,777 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:33,777 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:33,789 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 28 statements into 2 equivalence classes.
[2025-04-28 21:21:33,810 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:33,810 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:33,810 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:34,318 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:34,319 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:34,319 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465094460]
[2025-04-28 21:21:34,319 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465094460] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:34,319 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042848273]
[2025-04-28 21:21:34,319 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:34,319 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:34,322 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:34,326 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 21:21:34,330 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process
[2025-04-28 21:21:34,439 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 28 statements into 2 equivalence classes.
[2025-04-28 21:21:34,522 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:34,522 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:34,522 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:34,525 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 16 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:34,527 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:34,765 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:34,766 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:36,096 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:36,096 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042848273] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:36,097 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:36,097 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 19
[2025-04-28 21:21:36,097 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977024259]
[2025-04-28 21:21:36,097 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:36,097 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 19 states
[2025-04-28 21:21:36,098 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:36,098 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2025-04-28 21:21:36,099 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=300, Unknown=0, NotChecked=0, Total=342
[2025-04-28 21:21:36,099 INFO  L87              Difference]: Start difference. First operand 89 states and 435 transitions. Second operand  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:37,449 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:37,450 INFO  L93              Difference]: Finished difference Result 160 states and 1521 transitions.
[2025-04-28 21:21:37,451 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. 
[2025-04-28 21:21:37,451 INFO  L79                 Accepts]: Start accepts. Automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16) Word has length 28
[2025-04-28 21:21:37,451 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:37,470 INFO  L225             Difference]: With dead ends: 160
[2025-04-28 21:21:37,470 INFO  L226             Difference]: Without dead ends: 160
[2025-04-28 21:21:37,471 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992
[2025-04-28 21:21:37,473 INFO  L437           NwaCegarLoop]: 39 mSDtfsCounter, 15 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 678 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 713 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:37,473 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 478 Invalid, 713 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 678 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time]
[2025-04-28 21:21:37,475 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 160 states.
[2025-04-28 21:21:37,641 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 130.
[2025-04-28 21:21:37,643 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 130 states, 48 states have (on average 1.125) internal successors, (54), 54 states have internal predecessors, (54), 38 states have call successors, (38), 5 states have call predecessors, (38), 43 states have return successors, (1006), 70 states have call predecessors, (1006), 38 states have call successors, (1006)
[2025-04-28 21:21:37,655 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 1098 transitions.
[2025-04-28 21:21:37,655 INFO  L79                 Accepts]: Start accepts. Automaton has 130 states and 1098 transitions. Word has length 28
[2025-04-28 21:21:37,655 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:37,659 INFO  L485      AbstractCegarLoop]: Abstraction has 130 states and 1098 transitions.
[2025-04-28 21:21:37,659 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 19 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 16 states have internal predecessors, (23), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:37,659 INFO  L278                IsEmpty]: Start isEmpty. Operand 130 states and 1098 transitions.
[2025-04-28 21:21:37,708 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2025-04-28 21:21:37,708 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:37,708 INFO  L218           NwaCegarLoop]: trace histogram [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]
[2025-04-28 21:21:37,715 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0
[2025-04-28 21:21:37,913 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:37,913 INFO  L403      AbstractCegarLoop]: === Iteration 8 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:37,914 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:37,915 INFO  L85        PathProgramCache]: Analyzing trace with hash -2079117848, now seen corresponding path program 1 times
[2025-04-28 21:21:37,915 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:37,915 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86691298]
[2025-04-28 21:21:37,915 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:37,915 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:37,926 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:37,941 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:37,942 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:37,942 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:38,181 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2025-04-28 21:21:38,182 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:38,182 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86691298]
[2025-04-28 21:21:38,182 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86691298] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:38,182 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271897554]
[2025-04-28 21:21:38,182 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:38,182 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:38,185 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:38,188 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 21:21:38,192 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process
[2025-04-28 21:21:38,303 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 28 statements into 1 equivalence classes.
[2025-04-28 21:21:38,377 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 28 of 28 statements.
[2025-04-28 21:21:38,378 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:38,378 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:38,380 INFO  L256         TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 16 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:38,383 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:38,576 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:38,576 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:39,819 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:39,819 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [271897554] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:39,819 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:39,819 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18
[2025-04-28 21:21:39,819 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724194988]
[2025-04-28 21:21:39,819 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:39,820 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 18 states
[2025-04-28 21:21:39,820 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:39,820 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants.
[2025-04-28 21:21:39,820 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=267, Unknown=0, NotChecked=0, Total=306
[2025-04-28 21:21:39,821 INFO  L87              Difference]: Start difference. First operand 130 states and 1098 transitions. Second operand  has 18 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 15 states have internal predecessors, (24), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:40,724 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:40,724 INFO  L93              Difference]: Finished difference Result 216 states and 2683 transitions.
[2025-04-28 21:21:40,725 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2025-04-28 21:21:40,725 INFO  L79                 Accepts]: Start accepts. Automaton has  has 18 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 15 states have internal predecessors, (24), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16) Word has length 28
[2025-04-28 21:21:40,725 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:40,753 INFO  L225             Difference]: With dead ends: 216
[2025-04-28 21:21:40,753 INFO  L226             Difference]: Without dead ends: 216
[2025-04-28 21:21:40,754 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812
[2025-04-28 21:21:40,755 INFO  L437           NwaCegarLoop]: 39 mSDtfsCounter, 17 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:40,756 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 435 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time]
[2025-04-28 21:21:40,757 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 216 states.
[2025-04-28 21:21:41,115 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 155.
[2025-04-28 21:21:41,117 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 155 states, 58 states have (on average 1.103448275862069) internal successors, (64), 64 states have internal predecessors, (64), 43 states have call successors, (43), 5 states have call predecessors, (43), 53 states have return successors, (1506), 85 states have call predecessors, (1506), 43 states have call successors, (1506)
[2025-04-28 21:21:41,134 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 1613 transitions.
[2025-04-28 21:21:41,134 INFO  L79                 Accepts]: Start accepts. Automaton has 155 states and 1613 transitions. Word has length 28
[2025-04-28 21:21:41,135 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:41,135 INFO  L485      AbstractCegarLoop]: Abstraction has 155 states and 1613 transitions.
[2025-04-28 21:21:41,135 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 18 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 15 states have internal predecessors, (24), 12 states have call successors, (14), 1 states have call predecessors, (14), 9 states have return successors, (16), 9 states have call predecessors, (16), 12 states have call successors, (16)
[2025-04-28 21:21:41,135 INFO  L278                IsEmpty]: Start isEmpty. Operand 155 states and 1613 transitions.
[2025-04-28 21:21:41,162 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 41
[2025-04-28 21:21:41,162 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:41,162 INFO  L218           NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:41,169 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0
[2025-04-28 21:21:41,366 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:41,366 INFO  L403      AbstractCegarLoop]: === Iteration 9 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:41,367 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:41,368 INFO  L85        PathProgramCache]: Analyzing trace with hash 895586499, now seen corresponding path program 2 times
[2025-04-28 21:21:41,368 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:41,368 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585316154]
[2025-04-28 21:21:41,368 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:41,368 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:41,390 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 40 statements into 2 equivalence classes.
[2025-04-28 21:21:41,414 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 40 of 40 statements.
[2025-04-28 21:21:41,415 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:41,415 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:41,836 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked.
[2025-04-28 21:21:41,836 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:41,836 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585316154]
[2025-04-28 21:21:41,836 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585316154] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:41,836 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2775031]
[2025-04-28 21:21:41,837 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:41,837 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:41,840 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:41,844 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 21:21:41,848 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process
[2025-04-28 21:21:41,999 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 40 statements into 2 equivalence classes.
[2025-04-28 21:21:42,117 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 40 of 40 statements.
[2025-04-28 21:21:42,117 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:42,117 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:42,120 INFO  L256         TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 21 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:42,122 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:42,312 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked.
[2025-04-28 21:21:42,313 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:44,329 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked.
[2025-04-28 21:21:44,330 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [2775031] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:44,330 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:44,330 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 16
[2025-04-28 21:21:44,331 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326214503]
[2025-04-28 21:21:44,331 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:44,332 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 16 states
[2025-04-28 21:21:44,332 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:44,332 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants.
[2025-04-28 21:21:44,333 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240
[2025-04-28 21:21:44,333 INFO  L87              Difference]: Start difference. First operand 155 states and 1613 transitions. Second operand  has 16 states, 7 states have (on average 2.857142857142857) internal successors, (20), 12 states have internal predecessors, (20), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18)
[2025-04-28 21:21:44,687 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:44,687 INFO  L93              Difference]: Finished difference Result 236 states and 3426 transitions.
[2025-04-28 21:21:44,688 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2025-04-28 21:21:44,688 INFO  L79                 Accepts]: Start accepts. Automaton has  has 16 states, 7 states have (on average 2.857142857142857) internal successors, (20), 12 states have internal predecessors, (20), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 40
[2025-04-28 21:21:44,688 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:44,719 INFO  L225             Difference]: With dead ends: 236
[2025-04-28 21:21:44,719 INFO  L226             Difference]: Without dead ends: 236
[2025-04-28 21:21:44,720 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 72 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380
[2025-04-28 21:21:44,720 INFO  L437           NwaCegarLoop]: 43 mSDtfsCounter, 14 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:44,721 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 275 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2025-04-28 21:21:44,721 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 236 states.
[2025-04-28 21:21:45,078 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 158.
[2025-04-28 21:21:45,080 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 158 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 65 states have internal predecessors, (65), 44 states have call successors, (44), 5 states have call predecessors, (44), 54 states have return successors, (1585), 87 states have call predecessors, (1585), 44 states have call successors, (1585)
[2025-04-28 21:21:45,092 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 1694 transitions.
[2025-04-28 21:21:45,092 INFO  L79                 Accepts]: Start accepts. Automaton has 158 states and 1694 transitions. Word has length 40
[2025-04-28 21:21:45,092 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:45,093 INFO  L485      AbstractCegarLoop]: Abstraction has 158 states and 1694 transitions.
[2025-04-28 21:21:45,093 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 16 states, 7 states have (on average 2.857142857142857) internal successors, (20), 12 states have internal predecessors, (20), 12 states have call successors, (14), 1 states have call predecessors, (14), 7 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18)
[2025-04-28 21:21:45,093 INFO  L278                IsEmpty]: Start isEmpty. Operand 158 states and 1694 transitions.
[2025-04-28 21:21:45,119 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 41
[2025-04-28 21:21:45,119 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:45,119 INFO  L218           NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:45,126 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0
[2025-04-28 21:21:45,320 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9
[2025-04-28 21:21:45,320 INFO  L403      AbstractCegarLoop]: === Iteration 10 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:45,321 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:45,322 INFO  L85        PathProgramCache]: Analyzing trace with hash -2053828797, now seen corresponding path program 1 times
[2025-04-28 21:21:45,322 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:45,322 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953670827]
[2025-04-28 21:21:45,322 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:45,322 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:45,340 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 40 statements into 1 equivalence classes.
[2025-04-28 21:21:45,367 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 40 of 40 statements.
[2025-04-28 21:21:45,367 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:45,367 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:45,849 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked.
[2025-04-28 21:21:45,849 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:45,849 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953670827]
[2025-04-28 21:21:45,850 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953670827] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:45,850 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857703647]
[2025-04-28 21:21:45,850 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:45,850 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:45,854 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:45,856 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 21:21:45,860 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process
[2025-04-28 21:21:46,043 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 40 statements into 1 equivalence classes.
[2025-04-28 21:21:46,178 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 40 of 40 statements.
[2025-04-28 21:21:46,178 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:46,178 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:46,182 INFO  L256         TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 26 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:46,187 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
