./chc-comp-wrapper.sh ../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-202.smt2 .


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


This is Ultimate 0.3.0-dev-42d8767-m
[2025-04-28 21:21:36,725 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2025-04-28 21:21:36,826 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f57e103-ca47-4e87-be36-114aea15eae3/chc-comp25-scripts/participants/UltimateUnihorn/./chccomp-Unihorn_Default.epf
[2025-04-28 21:21:36,831 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2025-04-28 21:21:36,832 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2025-04-28 21:21:36,866 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2025-04-28 21:21:36,867 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2025-04-28 21:21:36,867 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2025-04-28 21:21:36,868 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2025-04-28 21:21:36,869 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2025-04-28 21:21:36,869 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2025-04-28 21:21:36,869 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2025-04-28 21:21:36,870 INFO  L153        SettingsManager]:  * Use SBE=true
[2025-04-28 21:21:36,870 INFO  L151        SettingsManager]: Preferences of ChcToBoogie differ from their defaults:
[2025-04-28 21:21:36,870 INFO  L153        SettingsManager]:  * Use one large procedure with gotos to replace tail recursive calls=false
[2025-04-28 21:21:36,872 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2025-04-28 21:21:36,872 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2025-04-28 21:21:36,872 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2025-04-28 21:21:36,872 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:36,872 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2025-04-28 21:21:36,872 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2025-04-28 21:21:36,872 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2025-04-28 21:21:36,873 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2025-04-28 21:21:36,873 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2025-04-28 21:21:36,873 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2025-04-28 21:21:36,874 INFO  L151        SettingsManager]: Preferences of SmtParser differ from their defaults:
[2025-04-28 21:21:36,874 INFO  L153        SettingsManager]:  * SmtParser Mode=UltimateTreeAutomizer
[2025-04-28 21:21:37,254 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2025-04-28 21:21:37,264 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2025-04-28 21:21:37,267 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2025-04-28 21:21:37,270 INFO  L270        PluginConnector]: Initializing SmtParser...
[2025-04-28 21:21:37,271 INFO  L274        PluginConnector]: SmtParser initialized
[2025-04-28 21:21:37,272 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f57e103-ca47-4e87-be36-114aea15eae3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-202.smt2
[2025-04-28 21:21:37,275 INFO  L314              SmtParser]: Parsing .smt2 file as a set of Horn Clauses
[2025-04-28 21:21:37,280 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
unknown
[2025-04-28 21:21:37,833 INFO  L339              SmtParser]: Successfully executed SMT file /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f57e103-ca47-4e87-be36-114aea15eae3/chc-comp25-scripts/participants/UltimateUnihorn/../../../chc-comp24-benchmarks/LIA/chc-comp24-LIA-202.smt2
[2025-04-28 21:21:37,837 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2025-04-28 21:21:37,839 INFO  L133        ToolchainWalker]: Walking toolchain with 4 elements.
[2025-04-28 21:21:37,840 INFO  L112        PluginConnector]: ------------------------ChcToBoogie----------------------------
[2025-04-28 21:21:37,841 INFO  L270        PluginConnector]: Initializing ChcToBoogie...
[2025-04-28 21:21:37,841 INFO  L274        PluginConnector]: ChcToBoogie initialized
[2025-04-28 21:21:37,848 INFO  L184        PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,900 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37 Unit
[2025-04-28 21:21:37,901 INFO  L131        PluginConnector]: ------------------------ END ChcToBoogie----------------------------
[2025-04-28 21:21:37,906 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2025-04-28 21:21:37,908 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2025-04-28 21:21:37,908 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2025-04-28 21:21:37,929 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,929 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,953 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,953 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,962 INFO  L184        PluginConnector]: Executing the observer ReplaceArrayAssignments from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,964 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,968 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,971 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,972 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,987 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2025-04-28 21:21:37,988 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2025-04-28 21:21:37,988 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2025-04-28 21:21:37,988 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2025-04-28 21:21:37,989 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (1/1) ...
[2025-04-28 21:21:37,992 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2025-04-28 21:21:38,008 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:38,022 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 21:21:38,027 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 21:21:38,038 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure False given in one single declaration
[2025-04-28 21:21:38,038 INFO  L130     BoogieDeclarations]: Found specification of procedure False
[2025-04-28 21:21:38,039 INFO  L138     BoogieDeclarations]: Found implementation of procedure False
[2025-04-28 21:21:38,039 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure CHC_COMP_FALSE given in one single declaration
[2025-04-28 21:21:38,039 INFO  L130     BoogieDeclarations]: Found specification of procedure CHC_COMP_FALSE
[2025-04-28 21:21:38,039 INFO  L138     BoogieDeclarations]: Found implementation of procedure CHC_COMP_FALSE
[2025-04-28 21:21:38,039 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure combined_lturn given in one single declaration
[2025-04-28 21:21:38,039 INFO  L130     BoogieDeclarations]: Found specification of procedure combined_lturn
[2025-04-28 21:21:38,039 INFO  L138     BoogieDeclarations]: Found implementation of procedure combined_lturn
[2025-04-28 21:21:38,039 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure lturn given in one single declaration
[2025-04-28 21:21:38,040 INFO  L130     BoogieDeclarations]: Found specification of procedure lturn
[2025-04-28 21:21:38,040 INFO  L138     BoogieDeclarations]: Found implementation of procedure lturn
[2025-04-28 21:21:38,040 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure step_lturn given in one single declaration
[2025-04-28 21:21:38,040 INFO  L130     BoogieDeclarations]: Found specification of procedure step_lturn
[2025-04-28 21:21:38,040 INFO  L138     BoogieDeclarations]: Found implementation of procedure step_lturn
[2025-04-28 21:21:38,040 INFO  L124     BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration
[2025-04-28 21:21:38,040 INFO  L130     BoogieDeclarations]: Found specification of procedure Ultimate.START
[2025-04-28 21:21:38,040 INFO  L138     BoogieDeclarations]: Found implementation of procedure Ultimate.START
[2025-04-28 21:21:38,101 INFO  L234             CfgBuilder]: Building ICFG
[2025-04-28 21:21:38,104 INFO  L260             CfgBuilder]: Building CFG for each procedure with an implementation
[2025-04-28 21:21:38,762 INFO  L?                        ?]: Removed 0 outVars from TransFormulas that were not future-live.
[2025-04-28 21:21:38,763 INFO  L283             CfgBuilder]: Performing block encoding
[2025-04-28 21:21:38,790 INFO  L304             CfgBuilder]: Using library mode
[2025-04-28 21:21:38,790 INFO  L312             CfgBuilder]: Removed 7 assume(true) statements.
[2025-04-28 21:21:38,791 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:38 BoogieIcfgContainer
[2025-04-28 21:21:38,791 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2025-04-28 21:21:38,798 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2025-04-28 21:21:38,798 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2025-04-28 21:21:38,805 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2025-04-28 21:21:38,806 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 28.04 09:21:37" (1/3) ...
[2025-04-28 21:21:38,806 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9de61ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 28.04 09:21:38, skipping insertion in model container
[2025-04-28 21:21:38,807 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 28.04 09:21:37" (2/3) ...
[2025-04-28 21:21:38,807 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9de61ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.04 09:21:38, skipping insertion in model container
[2025-04-28 21:21:38,807 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.04 09:21:38" (3/3) ...
[2025-04-28 21:21:38,809 INFO  L128   eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver
[2025-04-28 21:21:38,832 INFO  L217   ceAbstractionStarter]: Automizer settings: Hoare:None NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2025-04-28 21:21:38,835 INFO  L151   ceAbstractionStarter]: Applying trace abstraction to ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver that has 6 procedures, 142 locations, 428 edges, 6 initial locations, 0 loop locations, and 1 error locations.
[2025-04-28 21:21:38,906 INFO  L339      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2025-04-28 21:21:38,933 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;@1ce0bdf0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2025-04-28 21:21:38,934 INFO  L341      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2025-04-28 21:21:38,940 INFO  L278                IsEmpty]: Start isEmpty. Operand  has 142 states, 10 states have (on average 3.8) internal successors, (38), 36 states have internal predecessors, (38), 128 states have call successors, (130), 5 states have call predecessors, (130), 5 states have return successors, (130), 102 states have call predecessors, (130), 128 states have call successors, (130)
[2025-04-28 21:21:38,975 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2025-04-28 21:21:38,978 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:38,979 INFO  L218           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:38,983 INFO  L403      AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:38,990 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:38,991 INFO  L85        PathProgramCache]: Analyzing trace with hash -1347735922, now seen corresponding path program 1 times
[2025-04-28 21:21:39,000 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:39,001 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143960656]
[2025-04-28 21:21:39,001 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:39,002 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:39,050 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 18 statements into 1 equivalence classes.
[2025-04-28 21:21:39,178 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 18 of 18 statements.
[2025-04-28 21:21:39,178 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:39,179 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:39,717 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 21:21:39,719 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:39,719 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143960656]
[2025-04-28 21:21:39,720 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143960656] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:39,720 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:39,723 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2025-04-28 21:21:39,725 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766151834]
[2025-04-28 21:21:39,726 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:39,763 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 6 states
[2025-04-28 21:21:39,765 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:39,813 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2025-04-28 21:21:39,814 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2025-04-28 21:21:39,817 INFO  L87              Difference]: Start difference. First operand  has 142 states, 10 states have (on average 3.8) internal successors, (38), 36 states have internal predecessors, (38), 128 states have call successors, (130), 5 states have call predecessors, (130), 5 states have return successors, (130), 102 states have call predecessors, (130), 128 states have call successors, (130) Second operand  has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5)
[2025-04-28 21:21:41,911 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:41,911 INFO  L93              Difference]: Finished difference Result 221 states and 641 transitions.
[2025-04-28 21:21:41,913 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2025-04-28 21:21:41,914 INFO  L79                 Accepts]: Start accepts. Automaton has  has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 18
[2025-04-28 21:21:41,915 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:41,939 INFO  L225             Difference]: With dead ends: 221
[2025-04-28 21:21:41,939 INFO  L226             Difference]: Without dead ends: 221
[2025-04-28 21:21:41,944 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2025-04-28 21:21:41,952 INFO  L437           NwaCegarLoop]: 269 mSDtfsCounter, 17 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 998 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 1141 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:41,953 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 1141 Invalid, 1057 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [59 Valid, 998 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time]
[2025-04-28 21:21:41,972 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 221 states.
[2025-04-28 21:21:42,186 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 219.
[2025-04-28 21:21:42,189 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 219 states, 14 states have (on average 4.214285714285714) internal successors, (59), 53 states have internal predecessors, (59), 201 states have call successors, (204), 8 states have call predecessors, (204), 8 states have return successors, (376), 159 states have call predecessors, (376), 201 states have call successors, (376)
[2025-04-28 21:21:42,201 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 639 transitions.
[2025-04-28 21:21:42,202 INFO  L79                 Accepts]: Start accepts. Automaton has 219 states and 639 transitions. Word has length 18
[2025-04-28 21:21:42,204 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:42,204 INFO  L485      AbstractCegarLoop]: Abstraction has 219 states and 639 transitions.
[2025-04-28 21:21:42,204 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 6 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5)
[2025-04-28 21:21:42,204 INFO  L278                IsEmpty]: Start isEmpty. Operand 219 states and 639 transitions.
[2025-04-28 21:21:42,214 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2025-04-28 21:21:42,214 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:42,214 INFO  L218           NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:42,214 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2025-04-28 21:21:42,214 INFO  L403      AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:42,215 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:42,215 INFO  L85        PathProgramCache]: Analyzing trace with hash -1280800785, now seen corresponding path program 1 times
[2025-04-28 21:21:42,215 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:42,215 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090412457]
[2025-04-28 21:21:42,215 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:42,215 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:42,225 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes.
[2025-04-28 21:21:42,260 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:21:42,261 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:42,261 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:42,586 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2025-04-28 21:21:42,587 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:42,587 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090412457]
[2025-04-28 21:21:42,587 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090412457] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:42,587 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580523339]
[2025-04-28 21:21:42,588 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:42,589 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:42,591 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:42,597 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 21:21:42,599 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2025-04-28 21:21:42,646 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes.
[2025-04-28 21:21:42,691 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:21:42,691 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:42,691 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:42,694 INFO  L256         TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:42,701 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:42,840 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:42,840 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:43,589 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:43,590 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [580523339] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:43,590 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:43,591 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13
[2025-04-28 21:21:43,591 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395326882]
[2025-04-28 21:21:43,591 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:43,592 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 13 states
[2025-04-28 21:21:43,592 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:43,593 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2025-04-28 21:21:43,593 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156
[2025-04-28 21:21:43,593 INFO  L87              Difference]: Start difference. First operand 219 states and 639 transitions. Second operand  has 13 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (8), 1 states have call predecessors, (8), 9 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12)
[2025-04-28 21:21:51,399 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:51,399 INFO  L93              Difference]: Finished difference Result 543 states and 3908 transitions.
[2025-04-28 21:21:51,400 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2025-04-28 21:21:51,400 INFO  L79                 Accepts]: Start accepts. Automaton has  has 13 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (8), 1 states have call predecessors, (8), 9 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12) Word has length 21
[2025-04-28 21:21:51,400 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:51,469 INFO  L225             Difference]: With dead ends: 543
[2025-04-28 21:21:51,469 INFO  L226             Difference]: Without dead ends: 543
[2025-04-28 21:21:51,469 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506
[2025-04-28 21:21:51,470 INFO  L437           NwaCegarLoop]: 455 mSDtfsCounter, 21 mSDsluCounter, 3362 mSDsCounter, 0 mSdLazyCounter, 7069 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 3817 SdHoareTripleChecker+Invalid, 7265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 7069 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:51,471 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 3817 Invalid, 7265 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [196 Valid, 7069 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time]
[2025-04-28 21:21:51,473 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 543 states.
[2025-04-28 21:21:52,065 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 538.
[2025-04-28 21:21:52,069 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 538 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 105 states have internal predecessors, (112), 480 states have call successors, (485), 14 states have call predecessors, (485), 28 states have return successors, (3305), 420 states have call predecessors, (3305), 480 states have call successors, (3305)
[2025-04-28 21:21:52,102 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 538 states to 538 states and 3902 transitions.
[2025-04-28 21:21:52,102 INFO  L79                 Accepts]: Start accepts. Automaton has 538 states and 3902 transitions. Word has length 21
[2025-04-28 21:21:52,102 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:52,103 INFO  L485      AbstractCegarLoop]: Abstraction has 538 states and 3902 transitions.
[2025-04-28 21:21:52,103 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 13 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 4 states have call successors, (8), 1 states have call predecessors, (8), 9 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12)
[2025-04-28 21:21:52,103 INFO  L278                IsEmpty]: Start isEmpty. Operand 538 states and 3902 transitions.
[2025-04-28 21:21:52,121 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2025-04-28 21:21:52,121 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:52,121 INFO  L218           NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:21:52,127 INFO  L552       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0
[2025-04-28 21:21:52,325 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:52,326 INFO  L403      AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:52,327 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:52,328 INFO  L85        PathProgramCache]: Analyzing trace with hash -1329927638, now seen corresponding path program 1 times
[2025-04-28 21:21:52,328 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:52,328 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318531079]
[2025-04-28 21:21:52,328 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:52,328 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:52,335 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 21 statements into 1 equivalence classes.
[2025-04-28 21:21:52,360 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:21:52,360 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:52,364 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:52,550 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:52,551 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:52,551 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318531079]
[2025-04-28 21:21:52,551 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318531079] provided 1 perfect and 0 imperfect interpolant sequences
[2025-04-28 21:21:52,551 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2025-04-28 21:21:52,551 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2025-04-28 21:21:52,551 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051531362]
[2025-04-28 21:21:52,551 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2025-04-28 21:21:52,552 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 6 states
[2025-04-28 21:21:52,552 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:52,552 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2025-04-28 21:21:52,552 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2025-04-28 21:21:52,553 INFO  L87              Difference]: Start difference. First operand 538 states and 3902 transitions. Second operand  has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6)
[2025-04-28 21:21:53,595 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:21:53,595 INFO  L93              Difference]: Finished difference Result 579 states and 4913 transitions.
[2025-04-28 21:21:53,596 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2025-04-28 21:21:53,596 INFO  L79                 Accepts]: Start accepts. Automaton has  has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 21
[2025-04-28 21:21:53,596 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:21:53,660 INFO  L225             Difference]: With dead ends: 579
[2025-04-28 21:21:53,661 INFO  L226             Difference]: Without dead ends: 579
[2025-04-28 21:21:53,661 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2025-04-28 21:21:53,662 INFO  L437           NwaCegarLoop]: 278 mSDtfsCounter, 1 mSDsluCounter, 962 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 1240 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time
[2025-04-28 21:21:53,663 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 1240 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time]
[2025-04-28 21:21:53,665 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 579 states.
[2025-04-28 21:21:54,538 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 577.
[2025-04-28 21:21:54,544 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 577 states, 45 states have (on average 2.6444444444444444) internal successors, (119), 112 states have internal predecessors, (119), 505 states have call successors, (510), 14 states have call predecessors, (510), 35 states have return successors, (4282), 451 states have call predecessors, (4282), 505 states have call successors, (4282)
[2025-04-28 21:21:54,581 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 4911 transitions.
[2025-04-28 21:21:54,581 INFO  L79                 Accepts]: Start accepts. Automaton has 577 states and 4911 transitions. Word has length 21
[2025-04-28 21:21:54,582 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:21:54,582 INFO  L485      AbstractCegarLoop]: Abstraction has 577 states and 4911 transitions.
[2025-04-28 21:21:54,582 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6)
[2025-04-28 21:21:54,582 INFO  L278                IsEmpty]: Start isEmpty. Operand 577 states and 4911 transitions.
[2025-04-28 21:21:54,603 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2025-04-28 21:21:54,603 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:21:54,603 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]
[2025-04-28 21:21:54,603 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2025-04-28 21:21:54,604 INFO  L403      AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:21:54,605 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:21:54,606 INFO  L85        PathProgramCache]: Analyzing trace with hash 462880854, now seen corresponding path program 1 times
[2025-04-28 21:21:54,607 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:21:54,607 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456283094]
[2025-04-28 21:21:54,607 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:54,607 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:21:54,616 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 24 statements into 1 equivalence classes.
[2025-04-28 21:21:54,635 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 24 of 24 statements.
[2025-04-28 21:21:54,635 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:54,636 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:54,818 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:54,818 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:21:54,818 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456283094]
[2025-04-28 21:21:54,818 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456283094] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:21:54,819 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815869809]
[2025-04-28 21:21:54,819 INFO  L97    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2025-04-28 21:21:54,819 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:21:54,821 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:21:54,823 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 21:21:54,827 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2025-04-28 21:21:54,875 INFO  L108    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY partitioned 24 statements into 1 equivalence classes.
[2025-04-28 21:21:54,917 INFO  L111    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s) and asserted 24 of 24 statements.
[2025-04-28 21:21:54,917 INFO  L114    AnnotateAndAsserter]: Assert order NOT_INCREMENTALLY issued 1 check-sat command(s)
[2025-04-28 21:21:54,917 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:21:54,919 INFO  L256         TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 12 conjuncts are in the unsatisfiable core
[2025-04-28 21:21:54,921 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:21:55,051 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:55,051 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:21:55,802 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:21:55,802 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815869809] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:21:55,802 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:21:55,802 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17
[2025-04-28 21:21:55,802 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646496964]
[2025-04-28 21:21:55,802 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:21:55,803 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 17 states
[2025-04-28 21:21:55,803 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:21:55,803 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2025-04-28 21:21:55,803 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272
[2025-04-28 21:21:55,804 INFO  L87              Difference]: Start difference. First operand 577 states and 4911 transitions. Second operand  has 17 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (8), 1 states have call predecessors, (8), 13 states have return successors, (15), 11 states have call predecessors, (15), 4 states have call successors, (15)
[2025-04-28 21:22:00,240 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2025-04-28 21:22:00,241 INFO  L93              Difference]: Finished difference Result 1121 states and 18036 transitions.
[2025-04-28 21:22:00,241 INFO  L140   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2025-04-28 21:22:00,241 INFO  L79                 Accepts]: Start accepts. Automaton has  has 17 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (8), 1 states have call predecessors, (8), 13 states have return successors, (15), 11 states have call predecessors, (15), 4 states have call successors, (15) Word has length 24
[2025-04-28 21:22:00,242 INFO  L85                 Accepts]: Finished accepts. some prefix is accepted.
[2025-04-28 21:22:00,405 INFO  L225             Difference]: With dead ends: 1121
[2025-04-28 21:22:00,405 INFO  L226             Difference]: Without dead ends: 1121
[2025-04-28 21:22:00,405 INFO  L436           NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=445, Unknown=0, NotChecked=0, Total=506
[2025-04-28 21:22:00,406 INFO  L437           NwaCegarLoop]: 325 mSDtfsCounter, 29 mSDsluCounter, 3879 mSDsCounter, 0 mSdLazyCounter, 4934 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 4204 SdHoareTripleChecker+Invalid, 5243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 4934 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time
[2025-04-28 21:22:00,406 INFO  L438           NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 4204 Invalid, 5243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 4934 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time]
[2025-04-28 21:22:00,408 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1121 states.
[2025-04-28 21:22:03,554 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1121 to 987.
[2025-04-28 21:22:03,578 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 987 states, 96 states have (on average 1.9791666666666667) internal successors, (190), 177 states have internal predecessors, (190), 817 states have call successors, (824), 18 states have call predecessors, (824), 84 states have return successors, (12760), 792 states have call predecessors, (12760), 817 states have call successors, (12760)
[2025-04-28 21:22:03,736 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 987 states to 987 states and 13774 transitions.
[2025-04-28 21:22:03,736 INFO  L79                 Accepts]: Start accepts. Automaton has 987 states and 13774 transitions. Word has length 24
[2025-04-28 21:22:03,736 INFO  L85                 Accepts]: Finished accepts. word is rejected.
[2025-04-28 21:22:03,736 INFO  L485      AbstractCegarLoop]: Abstraction has 987 states and 13774 transitions.
[2025-04-28 21:22:03,736 INFO  L486      AbstractCegarLoop]: INTERPOLANT automaton has  has 17 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 13 states have internal predecessors, (20), 4 states have call successors, (8), 1 states have call predecessors, (8), 13 states have return successors, (15), 11 states have call predecessors, (15), 4 states have call successors, (15)
[2025-04-28 21:22:03,737 INFO  L278                IsEmpty]: Start isEmpty. Operand 987 states and 13774 transitions.
[2025-04-28 21:22:03,764 INFO  L284                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2025-04-28 21:22:03,764 INFO  L210           NwaCegarLoop]: Found error trace
[2025-04-28 21:22:03,765 INFO  L218           NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2025-04-28 21:22:03,771 INFO  L540       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2025-04-28 21:22:03,968 WARN  L466      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:03,969 INFO  L403      AbstractCegarLoop]: === Iteration 5 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] ===
[2025-04-28 21:22:03,970 INFO  L155       PredicateUnifier]: Initialized classic predicate unifier
[2025-04-28 21:22:03,970 INFO  L85        PathProgramCache]: Analyzing trace with hash -1271955593, now seen corresponding path program 2 times
[2025-04-28 21:22:03,970 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2025-04-28 21:22:03,971 INFO  L324   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009294588]
[2025-04-28 21:22:03,971 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:22:03,971 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2025-04-28 21:22:03,982 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 21 statements into 2 equivalence classes.
[2025-04-28 21:22:03,996 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:22:04,000 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:22:04,000 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:04,231 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2025-04-28 21:22:04,231 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2025-04-28 21:22:04,232 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009294588]
[2025-04-28 21:22:04,232 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009294588] provided 0 perfect and 1 imperfect interpolant sequences
[2025-04-28 21:22:04,232 INFO  L324   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944911746]
[2025-04-28 21:22:04,232 INFO  L95    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2025-04-28 21:22:04,232 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2025-04-28 21:22:04,234 INFO  L189       MonitoredProcess]: No working directory specified, using /usr/bin/z3
[2025-04-28 21:22:04,236 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 21:22:04,241 INFO  L327       MonitoredProcess]: [MP /usr/bin/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2025-04-28 21:22:04,290 INFO  L108    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 partitioned 21 statements into 2 equivalence classes.
[2025-04-28 21:22:04,329 INFO  L111    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) and asserted 21 of 21 statements.
[2025-04-28 21:22:04,330 INFO  L114    AnnotateAndAsserter]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2025-04-28 21:22:04,330 INFO  L115    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2025-04-28 21:22:04,331 INFO  L256         TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 12 conjuncts are in the unsatisfiable core
[2025-04-28 21:22:04,333 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2025-04-28 21:22:04,478 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:22:04,478 INFO  L312         TraceCheckSpWp]: Computing backward predicates...
[2025-04-28 21:22:05,055 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2025-04-28 21:22:05,055 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [944911746] provided 0 perfect and 2 imperfect interpolant sequences
[2025-04-28 21:22:05,055 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2025-04-28 21:22:05,055 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 14
[2025-04-28 21:22:05,057 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898149484]
[2025-04-28 21:22:05,057 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2025-04-28 21:22:05,057 INFO  L562      AbstractCegarLoop]: INTERPOLANT automaton has 14 states
[2025-04-28 21:22:05,057 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2025-04-28 21:22:05,058 INFO  L144   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2025-04-28 21:22:05,058 INFO  L146   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182
[2025-04-28 21:22:05,058 INFO  L87              Difference]: Start difference. First operand 987 states and 13774 transitions. Second operand  has 14 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 4 states have call successors, (8), 1 states have call predecessors, (8), 10 states have return successors, (13), 9 states have call predecessors, (13), 4 states have call successors, (13)
