./chc-comp-wrapper.sh ../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-028.smt2 .


--------------------------------------------------------------------------------


This is Ultimate 0.3.0-dev-42d8767-m
[2025-04-28 21:21:24,990 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2025-04-28 21:21:25,070 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f5a40e6-62e7-4ae5-94d2-75b989e70df3/chc-comp25-scripts/participants/UltimateUnihorn/./chccomp-Unihorn_Default.epf
[2025-04-28 21:21:25,075 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2025-04-28 21:21:25,076 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2025-04-28 21:21:25,103 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2025-04-28 21:21:25,104 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2025-04-28 21:21:25,104 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2025-04-28 21:21:25,105 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2025-04-28 21:21:25,106 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2025-04-28 21:21:25,106 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2025-04-28 21:21:25,107 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2025-04-28 21:21:25,107 INFO  L153        SettingsManager]:  * Use SBE=true
[2025-04-28 21:21:25,108 INFO  L151        SettingsManager]: Preferences of ChcToBoogie differ from their defaults:
[2025-04-28 21:21:25,108 INFO  L153        SettingsManager]:  * Use one large procedure with gotos to replace tail recursive calls=false
[2025-04-28 21:21:25,108 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:25,109 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2025-04-28 21:21:25,109 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2025-04-28 21:21:25,110 INFO  L151        SettingsManager]: Preferences of SmtParser differ from their defaults:
[2025-04-28 21:21:25,110 INFO  L153        SettingsManager]:  * SmtParser Mode=UltimateTreeAutomizer
[2025-04-28 21:21:25,467 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2025-04-28 21:21:25,480 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2025-04-28 21:21:25,484 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2025-04-28 21:21:25,486 INFO  L270        PluginConnector]: Initializing SmtParser...
[2025-04-28 21:21:25,486 INFO  L274        PluginConnector]: SmtParser initialized
[2025-04-28 21:21:25,489 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f5a40e6-62e7-4ae5-94d2-75b989e70df3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-028.smt2
[2025-04-28 21:21:25,491 INFO  L314              SmtParser]: Parsing .smt2 file as a set of Horn Clauses
[2025-04-28 21:21:25,498 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
unknown
[2025-04-28 21:21:25,696 INFO  L339              SmtParser]: Successfully executed SMT file /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6f5a40e6-62e7-4ae5-94d2-75b989e70df3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-028.smt2
[2025-04-28 21:21:25,699 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2025-04-28 21:21:25,701 INFO  L133        ToolchainWalker]: Walking toolchain with 4 elements.
[2025-04-28 21:21:25,702 INFO  L112        PluginConnector]: ------------------------ChcToBoogie----------------------------
[2025-04-28 21:21:25,702 INFO  L270        PluginConnector]: Initializing ChcToBoogie...
[2025-04-28 21:21:25,702 INFO  L274        PluginConnector]: ChcToBoogie initialized
[2025-04-28 21:21:25,705 INFO  L184        PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,730 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25 Unit
[2025-04-28 21:21:25,730 INFO  L131        PluginConnector]: ------------------------ END ChcToBoogie----------------------------
[2025-04-28 21:21:25,731 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2025-04-28 21:21:25,731 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2025-04-28 21:21:25,731 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2025-04-28 21:21:25,751 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,751 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,788 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,789 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,791 INFO  L184        PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,792 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,793 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,794 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,795 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,813 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2025-04-28 21:21:25,815 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2025-04-28 21:21:25,816 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2025-04-28 21:21:25,816 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2025-04-28 21:21:25,816 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (1/1) ...
[2025-04-28 21:21:25,819 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:25,833 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:25,849 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 21:21:25,854 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 21:21:25,868 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure False given in one single declaration
[2025-04-28 21:21:25,869 INFO  L130     BoogieDeclarations]: Found specification of procedure False
[2025-04-28 21:21:25,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure False
[2025-04-28 21:21:25,869 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure ERR given in one single declaration
[2025-04-28 21:21:25,869 INFO  L130     BoogieDeclarations]: Found specification of procedure ERR
[2025-04-28 21:21:25,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure ERR
[2025-04-28 21:21:25,869 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure MAIN given in one single declaration
[2025-04-28 21:21:25,869 INFO  L130     BoogieDeclarations]: Found specification of procedure MAIN
[2025-04-28 21:21:25,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure MAIN
[2025-04-28 21:21:25,869 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure top_reset given in one single declaration
[2025-04-28 21:21:25,870 INFO  L130     BoogieDeclarations]: Found specification of procedure top_reset
[2025-04-28 21:21:25,870 INFO  L138     BoogieDeclarations]: Found implementation of procedure top_reset
[2025-04-28 21:21:25,870 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure INIT_STATE given in one single declaration
[2025-04-28 21:21:25,870 INFO  L130     BoogieDeclarations]: Found specification of procedure INIT_STATE
[2025-04-28 21:21:25,870 INFO  L138     BoogieDeclarations]: Found implementation of procedure INIT_STATE
[2025-04-28 21:21:25,870 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure top_step given in one single declaration
[2025-04-28 21:21:25,870 INFO  L130     BoogieDeclarations]: Found specification of procedure top_step
[2025-04-28 21:21:25,870 INFO  L138     BoogieDeclarations]: Found implementation of procedure top_step
[2025-04-28 21:21:25,870 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration
[2025-04-28 21:21:25,870 INFO  L130     BoogieDeclarations]: Found specification of procedure Ultimate.START
[2025-04-28 21:21:25,870 INFO  L138     BoogieDeclarations]: Found implementation of procedure Ultimate.START
[2025-04-28 21:21:25,937 INFO  L234             CfgBuilder]: Building ICFG
[2025-04-28 21:21:25,940 INFO  L260             CfgBuilder]: Building CFG for each procedure with an implementation
[2025-04-28 21:21:26,101 INFO  L?                        ?]: Removed 8 outVars from TransFormulas that were not future-live.
[2025-04-28 21:21:26,101 INFO  L283             CfgBuilder]: Performing block encoding
[2025-04-28 21:21:26,120 INFO  L304             CfgBuilder]: Using library mode
[2025-04-28 21:21:26,121 INFO  L312             CfgBuilder]: Removed 4 assume(true) statements.
[2025-04-28 21:21:26,121 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:26 BoogieIcfgContainer
[2025-04-28 21:21:26,121 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2025-04-28 21:21:26,124 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2025-04-28 21:21:26,124 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2025-04-28 21:21:26,132 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2025-04-28 21:21:26,132 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:25" (1/3) ...
[2025-04-28 21:21:26,133 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf0e1e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 28.04 09:21:26, skipping insertion in model container
[2025-04-28 21:21:26,133 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:25" (2/3) ...
[2025-04-28 21:21:26,133 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf0e1e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.04 09:21:26, skipping insertion in model container
[2025-04-28 21:21:26,134 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:26" (3/3) ...
[2025-04-28 21:21:26,135 INFO  L128   eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver
[2025-04-28 21:21:26,156 INFO  L217   ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2025-04-28 21:21:26,159 INFO  L151   ceAbstractionStarter]: Applying trace abstraction to ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver that has 7 procedures, 26 locations, 36 edges, 7 initial locations, 0 loop locations, and 1 error locations.
[2025-04-28 21:21:26,208 INFO  L339      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2025-04-28 21:21:26,224 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;@5f58a3e1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2025-04-28 21:21:26,225 INFO  L341      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2025-04-28 21:21:26,229 INFO  L278                IsEmpty]: Start isEmpty. Operand  has 26 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 12 states have internal predecessors, (12), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8)
[2025-04-28 21:21:26,238 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2025-04-28 21:21:26,238 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:26,239 INFO  L218           NwaCegarLoop]: trace histogram [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 21:21:26,239 INFO  L403      AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:26,245 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:26,246 INFO  L85        PathProgramCache]: Analyzing trace with hash -2087563048, now seen corresponding path program 1 times
[2025-04-28 21:21:26,255 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:26,255 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131734168]
[2025-04-28 21:21:26,256 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:26,256 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:26,291 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 22 statements into 1 equivalence classes.
[2025-04-28 21:21:26,305 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 22 of 22 statements.
[2025-04-28 21:21:26,305 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:26,305 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:26,798 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 21:21:26,799 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:26,799 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131734168]
[2025-04-28 21:21:26,800 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131734168] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:26,800 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:26,803 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2025-04-28 21:21:26,805 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989084923]
[2025-04-28 21:21:26,808 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:26,813 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2025-04-28 21:21:26,813 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:26,848 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2025-04-28 21:21:26,849 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42
[2025-04-28 21:21:26,851 INFO  L87              Difference]: Start difference. First operand  has 26 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 12 states have internal predecessors, (12), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Second operand  has 7 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (6), 1 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6)
[2025-04-28 21:21:26,990 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:26,990 INFO  L93              Difference]: Finished difference Result 26 states and 28 transitions.
[2025-04-28 21:21:26,994 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2025-04-28 21:21:26,995 INFO  L79                 Accepts]: Start accepts. Automaton has  has 7 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (6), 1 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22
[2025-04-28 21:21:26,996 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:27,006 INFO  L225             Difference]: With dead ends: 26
[2025-04-28 21:21:27,007 INFO  L226             Difference]: Without dead ends: 26
[2025-04-28 21:21:27,009 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56
[2025-04-28 21:21:27,017 INFO  L437           NwaCegarLoop]: 22 mSDtfsCounter, 2 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:27,018 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 120 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:27,037 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 26 states.
[2025-04-28 21:21:27,065 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26.
[2025-04-28 21:21:27,066 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 11 states have (on average 1.0) internal successors, (11), 11 states have internal predecessors, (11), 7 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9)
[2025-04-28 21:21:27,092 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions.
[2025-04-28 21:21:27,094 INFO  L79                 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22
[2025-04-28 21:21:27,095 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:27,095 INFO  L485      AbstractCegarLoop]: Abstraction has 26 states and 28 transitions.
[2025-04-28 21:21:27,095 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (6), 1 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6)
[2025-04-28 21:21:27,095 INFO  L278                IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions.
[2025-04-28 21:21:27,097 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 30
[2025-04-28 21:21:27,097 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:27,097 INFO  L218           NwaCegarLoop]: trace histogram [2, 2, 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 21:21:27,098 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2025-04-28 21:21:27,098 INFO  L403      AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:27,099 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:27,099 INFO  L85        PathProgramCache]: Analyzing trace with hash 2099557298, now seen corresponding path program 1 times
[2025-04-28 21:21:27,100 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:27,100 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426886047]
[2025-04-28 21:21:27,100 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:27,100 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:27,112 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 29 statements into 1 equivalence classes.
[2025-04-28 21:21:27,120 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 29 of 29 statements.
[2025-04-28 21:21:27,120 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:27,120 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:27,917 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2025-04-28 21:21:27,918 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:27,918 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426886047]
[2025-04-28 21:21:27,918 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426886047] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:27,918 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269923790]
[2025-04-28 21:21:27,918 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:27,918 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:27,922 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:27,924 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 21:21:27,929 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2025-04-28 21:21:28,002 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 29 statements into 1 equivalence classes.
[2025-04-28 21:21:28,030 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 29 of 29 statements.
[2025-04-28 21:21:28,030 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:28,030 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:28,033 INFO  L256         TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 29 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:28,040 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:29,729 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2025-04-28 21:21:29,730 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:35,767 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2025-04-28 21:21:35,767 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269923790] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:35,767 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:35,767 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13
[2025-04-28 21:21:35,768 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111326567]
[2025-04-28 21:21:35,769 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:35,769 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 13 states
[2025-04-28 21:21:35,769 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:35,770 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2025-04-28 21:21:35,770 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156
[2025-04-28 21:21:35,771 INFO  L87              Difference]: Start difference. First operand 26 states and 28 transitions. Second operand  has 13 states, 8 states have (on average 1.875) internal successors, (15), 9 states have internal predecessors, (15), 6 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12)
[2025-04-28 21:21:35,991 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:35,992 INFO  L93              Difference]: Finished difference Result 29 states and 31 transitions.
[2025-04-28 21:21:35,994 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2025-04-28 21:21:35,995 INFO  L79                 Accepts]: Start accepts. Automaton has  has 13 states, 8 states have (on average 1.875) internal successors, (15), 9 states have internal predecessors, (15), 6 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) Word has length 29
[2025-04-28 21:21:35,995 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:35,996 INFO  L225             Difference]: With dead ends: 29
[2025-04-28 21:21:35,996 INFO  L226             Difference]: Without dead ends: 29
[2025-04-28 21:21:35,996 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240
[2025-04-28 21:21:35,997 INFO  L437           NwaCegarLoop]: 22 mSDtfsCounter, 4 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:35,997 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 209 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:36,000 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 29 states.
[2025-04-28 21:21:36,005 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28.
[2025-04-28 21:21:36,006 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 28 states, 12 states have (on average 1.0) internal successors, (12), 12 states have internal predecessors, (12), 7 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 9 states have call predecessors, (10), 7 states have call successors, (10)
[2025-04-28 21:21:36,006 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions.
[2025-04-28 21:21:36,007 INFO  L79                 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 29
[2025-04-28 21:21:36,007 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:36,007 INFO  L485      AbstractCegarLoop]: Abstraction has 28 states and 30 transitions.
[2025-04-28 21:21:36,007 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 13 states, 8 states have (on average 1.875) internal successors, (15), 9 states have internal predecessors, (15), 6 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12)
[2025-04-28 21:21:36,007 INFO  L278                IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions.
[2025-04-28 21:21:36,008 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 37
[2025-04-28 21:21:36,008 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:36,008 INFO  L218           NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:36,015 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2025-04-28 21:21:36,213 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:36,213 INFO  L403      AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:36,214 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:36,214 INFO  L85        PathProgramCache]: Analyzing trace with hash -759971024, now seen corresponding path program 2 times
[2025-04-28 21:21:36,214 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:36,214 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455735771]
[2025-04-28 21:21:36,214 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:36,215 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:36,227 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 36 statements into 2 equivalence classes.
[2025-04-28 21:21:36,236 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 36 of 36 statements.
[2025-04-28 21:21:36,236 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:36,236 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:37,101 INFO  L134       CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:37,102 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:37,102 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455735771]
[2025-04-28 21:21:37,102 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455735771] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:37,102 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503942998]
[2025-04-28 21:21:37,102 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:21:37,102 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:37,105 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:37,107 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 21:21:37,111 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2025-04-28 21:21:37,182 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 36 statements into 2 equivalence classes.
[2025-04-28 21:21:37,217 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 36 of 36 statements.
[2025-04-28 21:21:37,217 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:21:37,217 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:37,219 INFO  L256         TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 48 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:37,222 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:39,142 INFO  L134       CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:39,143 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:51,209 INFO  L134       CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2025-04-28 21:21:51,209 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503942998] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:51,209 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:51,209 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21
[2025-04-28 21:21:51,210 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808707576]
[2025-04-28 21:21:51,210 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:51,210 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 21 states
[2025-04-28 21:21:51,210 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:51,211 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2025-04-28 21:21:51,211 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420
[2025-04-28 21:21:51,212 INFO  L87              Difference]: Start difference. First operand 28 states and 30 transitions. Second operand  has 21 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 9 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (19), 12 states have call predecessors, (19), 9 states have call successors, (19)
[2025-04-28 21:21:51,863 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:51,863 INFO  L93              Difference]: Finished difference Result 31 states and 33 transitions.
[2025-04-28 21:21:51,864 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2025-04-28 21:21:51,864 INFO  L79                 Accepts]: Start accepts. Automaton has  has 21 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 9 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (19), 12 states have call predecessors, (19), 9 states have call successors, (19) Word has length 36
[2025-04-28 21:21:51,865 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:51,866 INFO  L225             Difference]: With dead ends: 31
[2025-04-28 21:21:51,867 INFO  L226             Difference]: Without dead ends: 31
[2025-04-28 21:21:51,868 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702
[2025-04-28 21:21:51,869 INFO  L437           NwaCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:51,870 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 299 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2025-04-28 21:21:51,871 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2025-04-28 21:21:51,879 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30.
[2025-04-28 21:21:51,879 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 30 states, 13 states have (on average 1.0) internal successors, (13), 13 states have internal predecessors, (13), 7 states have call successors, (8), 6 states have call predecessors, (8), 9 states have return successors, (11), 10 states have call predecessors, (11), 7 states have call successors, (11)
[2025-04-28 21:21:51,880 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions.
[2025-04-28 21:21:51,880 INFO  L79                 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 36
[2025-04-28 21:21:51,880 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:51,880 INFO  L485      AbstractCegarLoop]: Abstraction has 30 states and 32 transitions.
[2025-04-28 21:21:51,881 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 21 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 9 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (19), 12 states have call predecessors, (19), 9 states have call successors, (19)
[2025-04-28 21:21:51,881 INFO  L278                IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions.
[2025-04-28 21:21:51,881 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 44
[2025-04-28 21:21:51,883 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:51,883 INFO  L218           NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:51,889 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0
[2025-04-28 21:21:52,083 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:52,084 INFO  L403      AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:52,084 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:52,084 INFO  L85        PathProgramCache]: Analyzing trace with hash -1606623350, now seen corresponding path program 3 times
[2025-04-28 21:21:52,084 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:52,085 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254482882]
[2025-04-28 21:21:52,085 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2025-04-28 21:21:52,085 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:52,110 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 43 statements into 4 equivalence classes.
[2025-04-28 21:21:52,117 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) and asserted 43 of 43 statements.
[2025-04-28 21:21:52,117 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s)
[2025-04-28 21:21:52,117 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:53,375 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2025-04-28 21:21:53,375 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:53,376 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254482882]
[2025-04-28 21:21:53,376 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254482882] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:53,376 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052389280]
[2025-04-28 21:21:53,376 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2025-04-28 21:21:53,376 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:53,378 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:53,380 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 21:21:53,384 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2025-04-28 21:21:53,518 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 partitioned 43 statements into 4 equivalence classes.
[2025-04-28 21:21:53,548 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) and asserted 43 of 43 statements.
[2025-04-28 21:21:53,548 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s)
[2025-04-28 21:21:53,548 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:53,552 INFO  L256         TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 67 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:53,556 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:56,809 INFO  L134       CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked.
[2025-04-28 21:21:56,809 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
