/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o200.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:38:28,819 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 13:38:28,851 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:38:28,853 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:38:28,854 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:38:28,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:38:28,857 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:38:28,858 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:38:28,861 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:38:28,864 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:38:28,867 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:38:28,869 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:38:28,870 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:38:28,872 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:38:28,876 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:38:28,894 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:38:28,913 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:38:28,913 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:38:28,919 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:38:28,919 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:38:28,919 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:38:28,920 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:38:28,920 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:38:28,920 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:38:28,920 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:38:28,921 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:38:28,921 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:38:28,925 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:38:28,926 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:38:28,926 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:38:28,926 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:38:28,926 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:38:28,927 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:38:28,927 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:38:28,927 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:38:28,927 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:38:28,928 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:38:28,928 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:38:28,928 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:38:28,928 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:38:28,929 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:38:28,929 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:38:28,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:28,931 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:38:28,931 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:38:28,932 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:38:29,379 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:38:29,398 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:38:29,403 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:38:29,405 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:38:29,406 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:38:29,407 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-20 13:38:29,499 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/418834ec3/44c03bc068ad491e8fd4280d000d5624/FLAGf8f29ff74 [2020-07-20 13:38:30,208 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:38:30,209 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o200.c [2020-07-20 13:38:30,225 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/418834ec3/44c03bc068ad491e8fd4280d000d5624/FLAGf8f29ff74 [2020-07-20 13:38:30,464 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/418834ec3/44c03bc068ad491e8fd4280d000d5624 [2020-07-20 13:38:30,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:38:30,487 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:38:30,497 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:30,497 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:38:30,502 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:38:30,504 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:30,509 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@761e7545 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30, skipping insertion in model container [2020-07-20 13:38:30,510 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:30,523 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:38:30,552 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:38:30,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:30,935 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:38:30,961 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:38:30,980 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:38:30,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30 WrapperNode [2020-07-20 13:38:30,981 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:38:30,983 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:38:30,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:38:30,983 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:38:30,999 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:30,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,007 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,017 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,018 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... [2020-07-20 13:38:31,020 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:38:31,021 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:38:31,022 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:38:31,022 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:38:31,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:38:31,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:38:31,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:38:31,233 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 13:38:31,233 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:38:31,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 13:38:31,233 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:38:31,234 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 13:38:31,234 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:38:31,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:38:31,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:38:31,459 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:38:31,459 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:38:31,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:31 BoogieIcfgContainer [2020-07-20 13:38:31,465 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:38:31,467 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:38:31,468 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:38:31,472 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:38:31,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:38:30" (1/3) ... [2020-07-20 13:38:31,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d0b5e2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:31, skipping insertion in model container [2020-07-20 13:38:31,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:38:30" (2/3) ... [2020-07-20 13:38:31,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d0b5e2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:38:31, skipping insertion in model container [2020-07-20 13:38:31,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:38:31" (3/3) ... [2020-07-20 13:38:31,478 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o200.c [2020-07-20 13:38:31,494 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:38:31,504 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:38:31,526 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:38:31,564 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:38:31,564 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:38:31,565 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:38:31,565 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:38:31,565 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:38:31,565 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:38:31,565 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:38:31,566 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:38:31,592 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 13:38:31,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:38:31,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:31,603 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:31,604 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:31,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:31,612 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 13:38:31,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:31,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548459676] [2020-07-20 13:38:31,626 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:31,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:31,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:31,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 13:38:31,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:31,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:38:31,951 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:38:31,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548459676] [2020-07-20 13:38:31,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:38:31,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:38:31,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983547451] [2020-07-20 13:38:31,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:38:31,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:31,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:38:31,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:31,984 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 13:38:32,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:32,064 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 13:38:32,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:38:32,067 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:38:32,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:32,084 INFO L225 Difference]: With dead ends: 32 [2020-07-20 13:38:32,085 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 13:38:32,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:38:32,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 13:38:32,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 13:38:32,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 13:38:32,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 13:38:32,158 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 13:38:32,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:32,159 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 13:38:32,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:38:32,159 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 13:38:32,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:38:32,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:32,163 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:32,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:32,380 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:32,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:32,381 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 13:38:32,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:32,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003157730] [2020-07-20 13:38:32,383 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:32,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:32,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:32,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 13:38:32,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:32,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:32,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:32,748 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:38:32,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003157730] [2020-07-20 13:38:32,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:32,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 13:38:32,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405533305] [2020-07-20 13:38:32,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:38:32,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:32,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:38:32,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:32,755 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 13:38:32,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:32,825 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 13:38:32,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:32,827 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 13:38:32,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:32,828 INFO L225 Difference]: With dead ends: 30 [2020-07-20 13:38:32,829 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:38:32,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:38:32,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:38:32,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:38:32,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:38:32,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 13:38:32,841 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 13:38:32,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:32,841 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 13:38:32,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:38:32,842 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 13:38:32,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:38:32,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:32,844 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:33,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:33,058 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:33,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:33,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 13:38:33,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:33,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938455372] [2020-07-20 13:38:33,062 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:33,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:33,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:33,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:38:33,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:33,239 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:33,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:33,857 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:38:33,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938455372] [2020-07-20 13:38:33,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:33,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 13:38:33,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381083831] [2020-07-20 13:38:33,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:38:33,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:33,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:38:33,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:33,863 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 13:38:38,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:38,575 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 13:38:38,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:38:38,576 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 13:38:38,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:38,578 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:38:38,579 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 13:38:38,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=96, Invalid=454, Unknown=2, NotChecked=0, Total=552 [2020-07-20 13:38:38,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 13:38:38,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 13:38:38,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:38:38,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 13:38:38,591 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 13:38:38,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:38,592 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 13:38:38,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:38:38,592 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 13:38:38,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 13:38:38,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:38,595 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:38,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:38,812 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:38,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:38,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 13:38:38,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:38,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917244942] [2020-07-20 13:38:38,815 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:38,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:38,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:38,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 13:38:38,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:39,252 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:39,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:47,513 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 72 refuted. 5 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:38:47,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917244942] [2020-07-20 13:38:47,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:47,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 13:38:47,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337344700] [2020-07-20 13:38:47,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 13:38:47,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:47,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 13:38:47,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1073, Unknown=3, NotChecked=0, Total=1260 [2020-07-20 13:38:47,518 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 13:38:48,404 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 13:38:49,025 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 13:38:59,991 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 13:39:06,362 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-07-20 13:39:15,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:15,050 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 13:39:15,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 13:39:15,053 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 13:39:15,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:15,055 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:39:15,055 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:39:15,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 34.6s TimeCoverageRelationStatistics Valid=380, Invalid=1867, Unknown=9, NotChecked=0, Total=2256 [2020-07-20 13:39:15,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:39:15,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 13:39:15,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:39:15,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 13:39:15,068 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 13:39:15,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:15,069 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 13:39:15,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 13:39:15,069 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 13:39:15,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 13:39:15,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:15,073 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:15,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:15,277 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:15,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:15,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 13:39:15,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:15,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057164148] [2020-07-20 13:39:15,279 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:16,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:16,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:16,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 13:39:16,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:17,391 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:39:17,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:40,102 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 335 refuted. 10 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 13:39:40,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057164148] [2020-07-20 13:39:40,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:40,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 13:39:40,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836587504] [2020-07-20 13:39:40,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 13:39:40,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:40,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 13:39:40,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3932, Unknown=8, NotChecked=0, Total=4556 [2020-07-20 13:39:40,107 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 13:39:44,604 WARN L193 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-20 13:39:52,969 WARN L193 SmtUtils]: Spent 2.54 s on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 13:39:57,432 WARN L193 SmtUtils]: Spent 776.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-20 13:40:01,450 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 13:40:11,181 WARN L193 SmtUtils]: Spent 4.47 s on a formula simplification. DAG size of input: 68 DAG size of output: 18 [2020-07-20 13:40:17,716 WARN L193 SmtUtils]: Spent 766.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 13:40:21,059 WARN L193 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-20 13:40:26,435 WARN L193 SmtUtils]: Spent 399.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 13:40:29,443 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 13:40:34,716 WARN L193 SmtUtils]: Spent 559.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 13:40:39,119 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 13:40:44,225 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 13:40:51,908 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 13:40:58,779 WARN L193 SmtUtils]: Spent 2.25 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 13:41:00,397 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 13:41:04,213 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 13:41:11,450 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 13:41:20,684 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 13:41:25,852 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-20 13:41:42,139 WARN L193 SmtUtils]: Spent 4.19 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 13:41:59,958 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 13:42:02,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:02,526 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 13:42:02,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 13:42:02,529 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 13:42:02,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:02,538 INFO L225 Difference]: With dead ends: 114 [2020-07-20 13:42:02,539 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 13:42:02,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 160.4s TimeCoverageRelationStatistics Valid=1520, Invalid=7581, Unknown=19, NotChecked=0, Total=9120 [2020-07-20 13:42:02,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 13:42:02,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 13:42:02,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 13:42:02,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 13:42:02,598 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 13:42:02,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:02,600 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 13:42:02,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 13:42:02,607 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 13:42:02,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 13:42:02,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:02,624 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:02,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:02,835 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:02,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:02,836 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 13:42:02,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:02,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448364654] [2020-07-20 13:42:02,837 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:03,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:03,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:03,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 13:42:03,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:07,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:42:07,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:33,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1396 refuted. 61 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 13:44:33,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448364654] [2020-07-20 13:44:33,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:33,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 13:44:33,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527445716] [2020-07-20 13:44:33,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 13:44:33,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:33,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 13:44:33,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14988, Unknown=56, NotChecked=0, Total=17292 [2020-07-20 13:44:33,146 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 13:45:44,547 WARN L193 SmtUtils]: Spent 11.85 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 13:46:44,869 WARN L193 SmtUtils]: Spent 9.68 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 13:47:40,379 WARN L193 SmtUtils]: Spent 8.65 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 13:48:44,024 WARN L193 SmtUtils]: Spent 5.20 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 13:49:39,553 WARN L193 SmtUtils]: Spent 6.13 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 13:50:36,143 WARN L193 SmtUtils]: Spent 3.27 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 13:51:31,274 WARN L193 SmtUtils]: Spent 6.38 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 13:52:24,437 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification. DAG size of input: 141 DAG size of output: 11