/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 BIGGEST_EQUIVALENCE_CLASS --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/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:34:22,292 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:34:22,327 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:34:22,328 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:34:22,329 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:34:22,331 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:34:22,331 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:34:22,332 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:34:22,334 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:34:22,336 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:34:22,338 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:34:22,339 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:34:22,341 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:34:22,341 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:34:22,344 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:34:22,357 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 [2020-07-21 00:34:22,373 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:34:22,373 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:34:22,374 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:34:22,374 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:34:22,375 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:34:22,375 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:34:22,375 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:34:22,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:34:22,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:34:22,376 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:34:22,376 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:34:22,376 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:34:22,376 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:34:22,376 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:34:22,377 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:34:22,377 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:34:22,377 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:34:22,377 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:34:22,378 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:34:22,378 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:34:22,378 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:34:22,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:34:22,378 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:34:22,379 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:34:22,379 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:34:22,379 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:34:22,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:22,379 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:34:22,380 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:34:22,380 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 00:34:22,669 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:34:22,683 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:34:22,687 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:34:22,689 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:34:22,689 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:34:22,690 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 00:34:22,775 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423fe4cf0/aaee98bd333641c4896cec6076c8f1a5/FLAGcfcaccfb1 [2020-07-21 00:34:23,279 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:34:23,280 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 00:34:23,286 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423fe4cf0/aaee98bd333641c4896cec6076c8f1a5/FLAGcfcaccfb1 [2020-07-21 00:34:23,707 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/423fe4cf0/aaee98bd333641c4896cec6076c8f1a5 [2020-07-21 00:34:23,717 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:34:23,720 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:34:23,721 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:34:23,722 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:34:23,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:34:23,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:34:23" (1/1) ... [2020-07-21 00:34:23,731 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@369f4f1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:23, skipping insertion in model container [2020-07-21 00:34:23,732 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:34:23" (1/1) ... [2020-07-21 00:34:23,740 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:34:23,759 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:34:23,976 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:34:23,982 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:34:24,001 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:34:24,019 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:34:24,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24 WrapperNode [2020-07-21 00:34:24,020 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:34:24,021 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:34:24,021 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:34:24,021 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:34:24,037 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,037 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,043 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,044 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,048 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,051 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,052 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (1/1) ... [2020-07-21 00:34:24,053 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:34:24,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:34:24,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:34:24,054 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:34:24,056 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (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 [2020-07-21 00:34:24,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:34:24,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:34:24,294 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:34:24,294 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:34:24,294 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:34:24,295 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:34:24,295 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:34:24,295 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:34:24,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:34:24,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:34:24,489 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:34:24,490 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:34:24,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:34:24 BoogieIcfgContainer [2020-07-21 00:34:24,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:34:24,495 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:34:24,496 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:34:24,499 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:34:24,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:34:23" (1/3) ... [2020-07-21 00:34:24,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f4e4440 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:34:24, skipping insertion in model container [2020-07-21 00:34:24,500 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:34:24" (2/3) ... [2020-07-21 00:34:24,501 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f4e4440 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:34:24, skipping insertion in model container [2020-07-21 00:34:24,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:34:24" (3/3) ... [2020-07-21 00:34:24,503 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-21 00:34:24,514 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:34:24,531 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:34:24,546 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:34:24,572 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:34:24,572 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:34:24,572 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:34:24,573 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:34:24,573 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:34:24,573 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:34:24,573 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:34:24,573 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:34:24,594 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:34:24,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:34:24,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:24,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:24,603 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:24,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:24,610 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:34:24,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:24,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933587465] [2020-07-21 00:34:24,621 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 [2020-07-21 00:34:24,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:24,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:24,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:34:24,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:24,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:34:24,794 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:34:24,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933587465] [2020-07-21 00:34:24,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:34:24,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:34:24,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784621277] [2020-07-21 00:34:24,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:34:24,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:24,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:34:24,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:34:24,824 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:34:24,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:24,956 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:34:24,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:34:24,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:34:24,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:24,971 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:34:24,972 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:34:24,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:34:24,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:34:25,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:34:25,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:34:25,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:34:25,031 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:34:25,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:25,031 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:34:25,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:34:25,032 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:34:25,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:34:25,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:25,034 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:25,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:25,249 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:25,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:25,250 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:34:25,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:25,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653675244] [2020-07-21 00:34:25,252 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 [2020-07-21 00:34:25,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:34:25,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:25,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:34:25,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:25,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 00:34:25,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:34:25,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653675244] [2020-07-21 00:34:25,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:34:25,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:34:25,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807453089] [2020-07-21 00:34:25,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:34:25,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:25,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:34:25,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:34:25,353 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:34:25,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:25,418 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:34:25,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:34:25,419 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:34:25,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:25,421 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:34:25,421 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:34:25,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:34:25,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:34:25,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:34:25,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:34:25,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:34:25,432 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:34:25,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:25,432 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:34:25,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:34:25,433 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:34:25,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:34:25,434 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:25,434 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:25,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:25,651 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:25,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:25,653 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:34:25,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:25,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627571182] [2020-07-21 00:34:25,654 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 [2020-07-21 00:34:25,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:25,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:25,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:34:25,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:25,769 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:34:25,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:26,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:26,074 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:34:26,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627571182] [2020-07-21 00:34:26,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:26,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:34:26,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208782577] [2020-07-21 00:34:26,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:34:26,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:26,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:34:26,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:34:26,078 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:34:26,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:26,198 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:34:26,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:34:26,199 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:34:26,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:26,201 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:34:26,201 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:34:26,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:34:26,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:34:26,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:34:26,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:34:26,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:34:26,212 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:34:26,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:26,212 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:34:26,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:34:26,213 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:34:26,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:34:26,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:26,215 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:26,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:26,428 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:26,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:26,429 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:34:26,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:26,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441567636] [2020-07-21 00:34:26,431 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 [2020-07-21 00:34:26,455 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:26,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:26,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:34:26,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:26,505 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:34:26,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:26,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:26,717 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:34:26,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441567636] [2020-07-21 00:34:26,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:26,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:34:26,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722200247] [2020-07-21 00:34:26,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:34:26,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:26,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:34:26,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:34:26,723 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:34:26,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:26,839 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:34:26,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:34:26,840 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:34:26,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:26,843 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:34:26,844 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:34:26,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:34:26,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:34:26,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:34:26,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:34:26,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:34:26,866 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:34:26,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:26,867 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:34:26,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:34:26,869 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:34:26,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:34:26,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:26,873 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:27,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:27,088 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:27,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:27,088 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:34:27,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:27,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549394274] [2020-07-21 00:34:27,089 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 [2020-07-21 00:34:27,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:27,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:27,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:34:27,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:27,160 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 00:34:27,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:27,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:27,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:27,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:27,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:27,530 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:34:27,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549394274] [2020-07-21 00:34:27,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:27,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:34:27,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365082281] [2020-07-21 00:34:27,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:34:27,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:27,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:34:27,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:34:27,533 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:34:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:27,677 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:34:27,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:34:27,678 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:34:27,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:27,680 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:34:27,681 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:34:27,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:34:27,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:34:27,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:34:27,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:34:27,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:34:27,692 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:34:27,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:27,693 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:34:27,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:34:27,693 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:34:27,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:34:27,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:27,696 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:27,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:27,911 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:27,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:27,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:34:27,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:27,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409439934] [2020-07-21 00:34:27,913 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 [2020-07-21 00:34:27,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:27,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:27,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:34:27,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 00:34:28,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:28,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:28,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:28,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:34:28,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409439934] [2020-07-21 00:34:28,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:28,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:34:28,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390300224] [2020-07-21 00:34:28,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:34:28,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:28,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:34:28,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:34:28,335 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:34:28,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:28,469 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:34:28,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:34:28,470 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:34:28,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:28,478 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:34:28,478 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:34:28,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 00:34:28,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:34:28,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:34:28,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:34:28,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:34:28,504 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:34:28,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:28,509 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:34:28,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:34:28,510 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:34:28,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:34:28,516 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:28,517 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:28,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:28,730 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:28,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:28,731 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:34:28,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:28,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283002730] [2020-07-21 00:34:28,733 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:28,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:34:28,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:28,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:34:28,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:28,823 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 00:34:28,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:29,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:29,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:29,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:29,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:29,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:29,431 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 00:34:29,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283002730] [2020-07-21 00:34:29,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:29,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:34:29,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620083355] [2020-07-21 00:34:29,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:34:29,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:29,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:34:29,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:34:29,437 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:34:29,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:29,622 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:34:29,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:34:29,623 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:34:29,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:29,631 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:34:29,631 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:34:29,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:34:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:34:29,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:34:29,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:34:29,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:34:29,664 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:34:29,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:29,665 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:34:29,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:34:29,667 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:34:29,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:34:29,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:29,677 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:29,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:29,892 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:29,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:29,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:34:29,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:29,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589401584] [2020-07-21 00:34:29,895 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:29,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:29,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:29,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:34:29,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:30,003 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 00:34:30,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:30,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:30,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:30,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:30,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:30,629 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 00:34:30,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589401584] [2020-07-21 00:34:30,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:30,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:34:30,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807009586] [2020-07-21 00:34:30,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:34:30,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:30,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:34:30,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:34:30,640 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 00:34:30,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:30,792 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:34:30,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:34:30,795 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 00:34:30,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:30,797 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:34:30,798 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:34:30,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:34:30,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:34:30,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:34:30,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:34:30,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:34:30,811 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:34:30,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:30,811 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:34:30,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:34:30,812 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:34:30,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:34:30,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:30,814 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:31,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:31,030 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:31,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:31,032 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:34:31,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:31,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569249839] [2020-07-21 00:34:31,033 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:31,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:31,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:31,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:34:31,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:31,162 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 00:34:31,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:31,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:31,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:31,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:32,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:32,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:32,090 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:34:32,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569249839] [2020-07-21 00:34:32,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:32,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:34:32,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727629197] [2020-07-21 00:34:32,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:34:32,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:32,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:34:32,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:34:32,093 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 00:34:32,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:32,364 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:34:32,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:34:32,365 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 00:34:32,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:32,368 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:34:32,368 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:34:32,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:34:32,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:34:32,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:34:32,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:34:32,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:34:32,381 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:34:32,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:32,382 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:34:32,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:34:32,382 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:34:32,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:34:32,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:32,385 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:32,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:32,600 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:32,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:32,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:34:32,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:32,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807339148] [2020-07-21 00:34:32,603 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:32,679 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:32,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:32,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:34:32,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:32,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 00:34:32,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:33,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:33,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 00:34:33,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807339148] [2020-07-21 00:34:33,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:33,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:34:33,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903053028] [2020-07-21 00:34:33,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:34:33,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:33,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:34:33,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:34:33,855 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 00:34:34,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:34,021 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 00:34:34,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:34:34,022 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 00:34:34,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:34,026 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:34:34,027 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 00:34:34,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 00:34:34,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 00:34:34,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 00:34:34,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:34:34,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:34:34,051 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 00:34:34,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:34,054 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:34:34,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:34:34,054 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:34:34,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:34:34,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:34,062 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:34,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:34,278 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:34,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:34,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 00:34:34,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:34,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741790802] [2020-07-21 00:34:34,280 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:34,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:34,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:34,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:34:34,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:34,475 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 00:34:34,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:35,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:35,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:36,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:36,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:36,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:36,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:36,372 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 00:34:36,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741790802] [2020-07-21 00:34:36,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:36,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:34:36,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945647921] [2020-07-21 00:34:36,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:34:36,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:36,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:34:36,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:34:36,375 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 00:34:36,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:36,589 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 00:34:36,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:34:36,589 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 00:34:36,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:36,592 INFO L225 Difference]: With dead ends: 72 [2020-07-21 00:34:36,593 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:34:36,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:34:36,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:34:36,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 00:34:36,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:34:36,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:34:36,621 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 00:34:36,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:36,622 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:34:36,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:34:36,623 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:34:36,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 00:34:36,630 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:36,630 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:36,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:36,845 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:36,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:36,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 00:34:36,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:36,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254891591] [2020-07-21 00:34:36,846 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:36,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:36,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:36,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:34:36,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:37,088 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 00:34:37,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:38,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:38,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 00:34:38,970 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254891591] [2020-07-21 00:34:38,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:38,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:34:38,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159266263] [2020-07-21 00:34:38,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:34:38,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:38,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:34:38,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:34:38,976 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 00:34:39,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:39,223 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 00:34:39,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:34:39,223 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 00:34:39,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:39,226 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:34:39,227 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 00:34:39,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:34:39,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 00:34:39,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 00:34:39,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:34:39,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:34:39,240 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 00:34:39,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:39,241 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:34:39,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:34:39,241 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:34:39,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 00:34:39,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:39,245 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:39,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:39,458 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:39,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:39,458 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 00:34:39,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:39,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302795586] [2020-07-21 00:34:39,459 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:39,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:39,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:39,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:34:39,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:39,784 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 00:34:39,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:41,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:42,841 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 00:34:42,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302795586] [2020-07-21 00:34:42,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:42,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:34:42,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411427136] [2020-07-21 00:34:42,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:34:42,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:42,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:34:42,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:34:42,844 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 00:34:43,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:43,181 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 00:34:43,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:34:43,181 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 00:34:43,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:43,184 INFO L225 Difference]: With dead ends: 82 [2020-07-21 00:34:43,185 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:34:43,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 00:34:43,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:34:43,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 00:34:43,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:34:43,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:34:43,199 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 00:34:43,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:43,200 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:34:43,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:34:43,200 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:34:43,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 00:34:43,203 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:43,204 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:43,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:43,417 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:43,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:43,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 00:34:43,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:43,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997315600] [2020-07-21 00:34:43,419 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:43,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:43,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:43,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:34:43,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:43,727 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 00:34:43,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:45,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:45,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:45,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:46,695 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 00:34:46,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997315600] [2020-07-21 00:34:46,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:46,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:34:46,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928877298] [2020-07-21 00:34:46,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:34:46,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:46,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:34:46,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:34:46,698 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 00:34:47,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:47,158 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 00:34:47,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:34:47,159 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 00:34:47,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:47,165 INFO L225 Difference]: With dead ends: 87 [2020-07-21 00:34:47,166 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 00:34:47,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 00:34:47,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 00:34:47,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 00:34:47,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:34:47,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:34:47,204 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 00:34:47,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:47,205 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:34:47,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:34:47,205 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:34:47,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 00:34:47,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:47,218 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:47,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:47,432 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:47,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:47,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 00:34:47,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:47,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68870143] [2020-07-21 00:34:47,434 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:47,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:47,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:47,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:34:47,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:48,074 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 00:34:48,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:50,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:50,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:52,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:52,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:52,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:53,806 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 00:34:53,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68870143] [2020-07-21 00:34:53,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:34:53,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:34:53,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920063408] [2020-07-21 00:34:53,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:34:53,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:34:53,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:34:53,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:34:53,810 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 00:34:54,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:34:54,224 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 00:34:54,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:34:54,225 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 00:34:54,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:34:54,230 INFO L225 Difference]: With dead ends: 92 [2020-07-21 00:34:54,230 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 00:34:54,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:34:54,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 00:34:54,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 00:34:54,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:34:54,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:34:54,246 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 00:34:54,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:34:54,248 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:34:54,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:34:54,248 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:34:54,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 00:34:54,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:34:54,262 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:34:54,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:54,476 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:34:54,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:34:54,477 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 00:34:54,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:34:54,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099794116] [2020-07-21 00:34:54,479 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:34:54,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:34:54,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:34:54,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:34:54,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:34:55,279 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 00:34:55,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:34:58,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:58,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:34:59,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:00,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:00,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:00,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:00,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:01,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:01,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:01,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:01,966 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 00:35:01,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099794116] [2020-07-21 00:35:01,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:35:01,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:35:01,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233004983] [2020-07-21 00:35:01,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:35:01,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:35:01,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:35:01,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:35:01,970 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 00:35:02,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:35:02,537 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 00:35:02,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:35:02,538 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 00:35:02,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:35:02,544 INFO L225 Difference]: With dead ends: 97 [2020-07-21 00:35:02,544 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 00:35:02,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:35:02,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 00:35:02,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 00:35:02,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:35:02,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:35:02,560 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 00:35:02,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:35:02,562 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:35:02,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:35:02,563 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:35:02,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 00:35:02,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:35:02,584 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:35:02,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:02,798 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:35:02,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:35:02,799 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 00:35:02,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:35:02,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468204724] [2020-07-21 00:35:02,800 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:03,148 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:35:03,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:35:03,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 876 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:35:03,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:35:04,187 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 00:35:04,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:35:09,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:11,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:12,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:13,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:14,783 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 00:35:14,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468204724] [2020-07-21 00:35:14,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:35:14,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:35:14,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977883533] [2020-07-21 00:35:14,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:35:14,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:35:14,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:35:14,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:35:14,788 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 00:35:15,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:35:15,612 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 00:35:15,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:35:15,613 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 00:35:15,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:35:15,623 INFO L225 Difference]: With dead ends: 102 [2020-07-21 00:35:15,623 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 00:35:15,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:35:15,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 00:35:15,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 00:35:15,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:35:15,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:35:15,640 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 00:35:15,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:35:15,641 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:35:15,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:35:15,642 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:35:15,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 00:35:15,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:35:15,676 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:35:15,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:15,891 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:35:15,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:35:15,891 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 00:35:15,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:35:15,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1101311295] [2020-07-21 00:35:15,893 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:16,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:35:16,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:35:16,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:35:16,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:35:17,595 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 00:35:17,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:35:22,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:25,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:25,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:27,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:27,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:27,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:28,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:28,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:28,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:28,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:28,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 00:35:29,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1101311295] [2020-07-21 00:35:29,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:35:29,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:35:29,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983057665] [2020-07-21 00:35:29,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:35:29,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:35:29,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:35:29,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:35:29,823 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 00:35:30,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:35:30,367 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 00:35:30,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:35:30,368 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 00:35:30,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:35:30,373 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:35:30,374 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 00:35:30,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:35:30,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 00:35:30,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 00:35:30,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:35:30,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:35:30,393 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 00:35:30,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:35:30,395 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:35:30,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:35:30,395 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:35:30,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 00:35:30,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:35:30,427 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:35:30,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:30,628 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:35:30,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:35:30,630 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 00:35:30,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:35:30,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142922883] [2020-07-21 00:35:30,631 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:31,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:35:31,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:35:31,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:35:31,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:35:33,653 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 00:35:33,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:35:40,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:44,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:46,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:47,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:47,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:48,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:35:50,346 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 00:35:50,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142922883] [2020-07-21 00:35:50,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:35:50,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:35:50,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967301938] [2020-07-21 00:35:50,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:35:50,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:35:50,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:35:50,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:35:50,351 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 00:35:51,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:35:51,101 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 00:35:51,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:35:51,102 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 00:35:51,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:35:51,108 INFO L225 Difference]: With dead ends: 112 [2020-07-21 00:35:51,108 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 00:35:51,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:35:51,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 00:35:51,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 00:35:51,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:35:51,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:35:51,127 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 00:35:51,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:35:51,128 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:35:51,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:35:51,129 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:35:51,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 00:35:51,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:35:51,167 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:35:51,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:51,375 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:35:51,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:35:51,376 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 00:35:51,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:35:51,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257313869] [2020-07-21 00:35:51,378 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:35:51,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:35:51,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:35:51,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:35:51,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:35:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 00:35:53,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:01,062 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:36:01,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:05,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:07,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:07,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:08,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:09,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:11,450 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 00:36:11,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257313869] [2020-07-21 00:36:11,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:11,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:36:11,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659367173] [2020-07-21 00:36:11,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:36:11,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:11,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:36:11,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:36:11,453 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 00:36:12,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:12,286 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 00:36:12,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:36:12,287 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 00:36:12,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:12,296 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:36:12,297 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 00:36:12,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:36:12,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 00:36:12,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 00:36:12,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:36:12,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:36:12,321 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 00:36:12,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:12,323 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:36:12,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:36:12,323 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:36:12,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 00:36:12,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:12,424 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:36:12,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:12,626 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:12,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:12,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 00:36:12,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:12,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731664497] [2020-07-21 00:36:12,629 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:13,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:13,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:13,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 2216 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:36:13,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 00:36:18,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:34,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:42,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:47,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:48,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:49,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:49,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:49,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:50,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:50,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:50,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:55,519 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 00:36:55,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731664497] [2020-07-21 00:36:55,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:55,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:36:55,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814794134] [2020-07-21 00:36:55,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:36:55,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:55,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:36:55,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:36:55,524 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 00:36:56,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:56,821 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 00:36:56,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:36:56,822 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 00:36:56,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:56,830 INFO L225 Difference]: With dead ends: 122 [2020-07-21 00:36:56,830 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 00:36:56,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:36:56,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 00:36:56,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 00:36:56,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:36:56,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:36:56,853 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 00:36:56,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:56,855 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:36:56,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:36:56,855 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:36:56,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5062 [2020-07-21 00:36:56,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:56,998 INFO L422 BasicCegarLoop]: trace histogram [737, 737, 632, 368, 368, 368, 368, 368, 368, 368, 264, 105, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:36:57,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:57,199 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:57,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:57,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1250597211, now seen corresponding path program 10 times [2020-07-21 00:36:57,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:57,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189160411] [2020-07-21 00:36:57,203 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:58,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:58,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:58,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 2806 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:36:58,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:37:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40185 refuted. 0 times theorem prover too weak. 1509018 trivial. 0 not checked. [2020-07-21 00:37:06,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:37:25,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:37,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:37,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:43,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:43,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:45,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:45,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:47,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:47,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:48,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:48,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:48,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:57,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40340 refuted. 0 times theorem prover too weak. 1508863 trivial. 0 not checked. [2020-07-21 00:37:57,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189160411] [2020-07-21 00:37:57,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:37:57,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:37:57,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546259672] [2020-07-21 00:37:57,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:37:57,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:37:57,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:37:57,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:37:57,510 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 00:37:59,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:37:59,282 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 00:37:59,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:37:59,288 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5061 [2020-07-21 00:37:59,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:37:59,295 INFO L225 Difference]: With dead ends: 127 [2020-07-21 00:37:59,296 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 00:37:59,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10132 GetRequests, 10074 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:37:59,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 00:37:59,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 00:37:59,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:37:59,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:37:59,320 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5061 [2020-07-21 00:37:59,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:37:59,323 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:37:59,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:37:59,323 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:37:59,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10297 [2020-07-21 00:37:59,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:37:59,885 INFO L422 BasicCegarLoop]: trace histogram [1583, 1583, 792, 791, 791, 791, 791, 791, 791, 791, 791, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:38:00,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:38:00,086 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:38:00,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:38:00,091 INFO L82 PathProgramCache]: Analyzing trace with hash -862919848, now seen corresponding path program 11 times [2020-07-21 00:38:00,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:38:00,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432126246] [2020-07-21 00:38:00,091 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:38:01,817 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:38:01,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:38:01,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 5736 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:38:01,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:38:33,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88343 refuted. 0 times theorem prover too weak. 6471084 trivial. 0 not checked. [2020-07-21 00:38:33,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:21,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:54,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:11,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:11,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:17,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:17,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:22,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:24,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:24,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:26,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:26,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:26,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:02,079 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88519 refuted. 0 times theorem prover too weak. 6470908 trivial. 0 not checked. [2020-07-21 00:41:02,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432126246] [2020-07-21 00:41:02,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:41:02,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:41:02,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467990913] [2020-07-21 00:41:02,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:41:02,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:41:02,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:41:02,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:41:02,091 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 00:41:04,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:41:04,614 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 00:41:04,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:41:04,617 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10296 [2020-07-21 00:41:04,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:41:04,629 INFO L225 Difference]: With dead ends: 132 [2020-07-21 00:41:04,629 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 00:41:04,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20604 GetRequests, 20541 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:41:04,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 00:41:04,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 00:41:04,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:41:04,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:41:04,655 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10296 [2020-07-21 00:41:04,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:41:04,662 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:41:04,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:41:04,662 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:41:05,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7919 [2020-07-21 00:41:05,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:41:05,456 INFO L422 BasicCegarLoop]: trace histogram [1169, 1169, 897, 584, 584, 584, 584, 584, 584, 584, 313, 272, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:41:05,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:41:05,671 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:41:05,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:41:05,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1363142165, now seen corresponding path program 11 times [2020-07-21 00:41:05,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:41:05,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323183676] [2020-07-21 00:41:05,678 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:41:07,308 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:41:07,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:41:07,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 4395 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:41:07,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:41:27,342 INFO L134 CoverageAnalysis]: Checked inductivity of 3813584 backedges. 8534 proven. 69247 refuted. 0 times theorem prover too weak. 3735803 trivial. 0 not checked. [2020-07-21 00:41:27,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:41:34,530 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:41:34,632 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:41:34,742 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:41:34,846 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:41:38,564 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:41:38,673 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:41:38,792 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 00:41:38,913 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 00:41:39,034 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 00:41:39,146 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 00:42:17,273 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:42:17,381 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:42:17,487 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:42:17,593 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:42:17,698 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 00:42:18,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:18,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:37,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:55,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:55,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:04,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:04,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:07,585 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 00:43:08,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:08,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:10,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:10,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:12,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:13,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:13,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:13,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:13,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:13,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:14,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:34,912 INFO L134 CoverageAnalysis]: Checked inductivity of 3813584 backedges. 8534 proven. 69434 refuted. 0 times theorem prover too weak. 3735616 trivial. 0 not checked. [2020-07-21 00:43:34,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323183676] [2020-07-21 00:43:34,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:43:34,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:43:34,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399694640] [2020-07-21 00:43:34,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:43:34,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:43:34,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:43:34,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:43:34,920 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 00:43:36,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:43:36,347 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 00:43:36,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:43:36,350 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7918 [2020-07-21 00:43:36,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:43:36,364 INFO L225 Difference]: With dead ends: 137 [2020-07-21 00:43:36,365 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 00:43:36,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15847 GetRequests, 15784 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:43:36,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 00:43:36,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 00:43:36,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:43:36,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:43:36,402 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7918 [2020-07-21 00:43:36,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:43:36,407 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:43:36,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:43:36,408 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:43:38,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16147 [2020-07-21 00:43:38,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:43:38,770 INFO L422 BasicCegarLoop]: trace histogram [2483, 2483, 1242, 1241, 1241, 1241, 1241, 1241, 1241, 1241, 1241, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:43:38,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:43:38,971 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:43:38,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:43:38,976 INFO L82 PathProgramCache]: Analyzing trace with hash -1153856696, now seen corresponding path program 12 times [2020-07-21 00:43:38,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:43:38,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473833605] [2020-07-21 00:43:38,977 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:43:41,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:43:41,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:43:41,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 9002 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 00:43:41,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:45:08,161 INFO L134 CoverageAnalysis]: Checked inductivity of 16172712 backedges. 16185 proven. 154239 refuted. 0 times theorem prover too weak. 16002288 trivial. 0 not checked. [2020-07-21 00:45:08,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:20,404 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:45:20,511 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 00:45:20,637 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 00:45:20,754 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 00:45:30,627 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 00:45:30,759 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 00:45:30,895 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 00:45:31,035 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 00:45:31,160 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 00:45:31,276 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 00:45:31,387 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 00:45:31,506 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 00:45:31,617 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 00:47:00,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:28,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:28,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts