/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:53:27,793 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:53:27,800 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:53:27,834 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 19:53:27,885 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:53:27,891 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:53:27,896 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:53:27,900 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:53:27,905 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:53:27,907 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:53:27,910 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:53:27,922 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:53:27,931 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:53:27,940 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:53:27,942 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:53:27,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:53:27,948 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:53:27,962 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:53:27,963 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:53:27,964 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:53:27,966 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 19:53:27,990 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:53:27,990 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:53:27,993 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:53:27,993 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:53:27,994 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:53:27,994 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:53:27,994 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:53:27,995 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:53:27,995 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:53:27,995 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:53:27,995 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:53:27,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:53:27,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:53:27,996 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:53:27,996 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:53:27,997 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:53:27,997 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:53:27,997 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:53:27,998 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:53:27,998 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:53:27,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:53:27,998 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:53:27,999 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:53:27,999 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:53:27,999 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:53:27,999 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:53:28,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:28,000 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:53:28,000 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:53:28,001 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 -> DAGSIZE 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 -> 2 [2020-07-21 19:53:28,484 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:53:28,513 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:53:28,522 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:53:28,526 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:53:28,527 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:53:28,530 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 19:53:28,690 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/125bcff91/ce2d30a172d447a18f0a3bf0ccda6525/FLAGec595d1c5 [2020-07-21 19:53:29,679 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:53:29,680 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 19:53:29,697 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/125bcff91/ce2d30a172d447a18f0a3bf0ccda6525/FLAGec595d1c5 [2020-07-21 19:53:30,062 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/125bcff91/ce2d30a172d447a18f0a3bf0ccda6525 [2020-07-21 19:53:30,082 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:53:30,088 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:53:30,091 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:30,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:53:30,098 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:53:30,101 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,107 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@585dd8a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30, skipping insertion in model container [2020-07-21 19:53:30,108 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,122 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:53:30,159 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:53:30,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:30,441 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:53:30,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:30,517 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:53:30,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30 WrapperNode [2020-07-21 19:53:30,519 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:30,522 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:53:30,522 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:53:30,523 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:53:30,697 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,722 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,736 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... [2020-07-21 19:53:30,741 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:53:30,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:53:30,742 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:53:30,742 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:53:30,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:53:30,860 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:53:30,860 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:53:30,861 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:53:30,861 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:53:30,861 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:53:30,862 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:53:30,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:53:30,863 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:53:31,364 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:53:31,365 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:53:31,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:31 BoogieIcfgContainer [2020-07-21 19:53:31,378 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:53:31,381 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:53:31,382 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:53:31,388 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:53:31,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:53:30" (1/3) ... [2020-07-21 19:53:31,391 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@258dd87d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:31, skipping insertion in model container [2020-07-21 19:53:31,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:30" (2/3) ... [2020-07-21 19:53:31,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@258dd87d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:31, skipping insertion in model container [2020-07-21 19:53:31,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:31" (3/3) ... [2020-07-21 19:53:31,401 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-21 19:53:31,429 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:53:31,446 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:53:31,474 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:53:31,522 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:53:31,523 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:53:31,523 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:53:31,524 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:53:31,524 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:53:31,524 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:53:31,525 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:53:31,525 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:53:31,563 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-21 19:53:31,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:31,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:31,583 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:31,584 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:31,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:31,594 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-21 19:53:31,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:31,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057229047] [2020-07-21 19:53:31,607 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:31,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:31,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:31,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:31,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:31,848 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 19:53:31,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:31,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057229047] [2020-07-21 19:53:31,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:31,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:31,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451815294] [2020-07-21 19:53:31,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:31,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:31,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:31,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:31,897 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-21 19:53:31,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:31,999 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-21 19:53:32,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:32,003 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:32,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:32,027 INFO L225 Difference]: With dead ends: 75 [2020-07-21 19:53:32,027 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 19:53:32,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 19:53:32,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-21 19:53:32,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 19:53:32,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-21 19:53:32,114 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-21 19:53:32,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:32,116 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-21 19:53:32,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:32,117 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-21 19:53:32,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:32,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:32,119 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:32,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:32,335 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:32,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:32,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-21 19:53:32,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:32,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071717426] [2020-07-21 19:53:32,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:32,428 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:32,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:32,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:32,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:32,457 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 19:53:32,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:32,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071717426] [2020-07-21 19:53:32,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:32,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:32,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800439982] [2020-07-21 19:53:32,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:32,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:32,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:32,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,466 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-21 19:53:32,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:32,519 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-21 19:53:32,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:32,520 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:32,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:32,523 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:53:32,523 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 19:53:32,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 19:53:32,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-21 19:53:32,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 19:53:32,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-21 19:53:32,561 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-21 19:53:32,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:32,562 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-21 19:53:32,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:32,562 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-21 19:53:32,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:32,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:32,564 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:32,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:32,784 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:32,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:32,786 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-21 19:53:32,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:32,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92123941] [2020-07-21 19:53:32,788 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:32,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:32,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:32,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:32,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:32,943 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 19:53:32,944 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:32,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92123941] [2020-07-21 19:53:32,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:32,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:32,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212012159] [2020-07-21 19:53:32,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:32,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:32,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:32,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,951 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-21 19:53:33,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:33,002 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-07-21 19:53:33,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:33,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:33,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:33,006 INFO L225 Difference]: With dead ends: 90 [2020-07-21 19:53:33,006 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:53:33,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:33,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:53:33,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-07-21 19:53:33,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:53:33,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-07-21 19:53:33,021 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-07-21 19:53:33,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:33,022 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-07-21 19:53:33,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:33,022 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-07-21 19:53:33,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:33,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:33,024 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:33,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:33,239 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:33,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:33,241 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-07-21 19:53:33,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:33,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079199739] [2020-07-21 19:53:33,242 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:33,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:33,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:33,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:33,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:33,323 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 19:53:33,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:33,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079199739] [2020-07-21 19:53:33,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:33,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:33,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330962183] [2020-07-21 19:53:33,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:33,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:33,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:33,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:33,327 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-07-21 19:53:33,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:33,361 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-07-21 19:53:33,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:33,362 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:33,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:33,365 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:53:33,365 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 19:53:33,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:33,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 19:53:33,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 19:53:33,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 19:53:33,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-21 19:53:33,385 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-21 19:53:33,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:33,386 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-21 19:53:33,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:33,387 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-21 19:53:33,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:33,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:33,389 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:33,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:33,596 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:33,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:33,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-21 19:53:33,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:33,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38065601] [2020-07-21 19:53:33,599 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:33,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:33,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:33,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:33,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:33,686 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 19:53:33,686 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:33,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38065601] [2020-07-21 19:53:33,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:33,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:33,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175899819] [2020-07-21 19:53:33,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:33,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:33,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:33,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:33,691 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-21 19:53:33,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:33,759 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-21 19:53:33,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:33,761 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:33,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:33,764 INFO L225 Difference]: With dead ends: 184 [2020-07-21 19:53:33,764 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 19:53:33,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:33,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 19:53:33,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-21 19:53:33,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 19:53:33,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-21 19:53:33,788 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-21 19:53:33,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:33,789 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-21 19:53:33,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:33,790 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-21 19:53:33,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:33,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:33,792 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:34,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:34,008 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:34,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:34,009 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-21 19:53:34,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:34,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028813071] [2020-07-21 19:53:34,011 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:34,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:34,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:34,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:34,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:34,078 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 19:53:34,079 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:34,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028813071] [2020-07-21 19:53:34,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:34,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:34,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795508204] [2020-07-21 19:53:34,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:34,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:34,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:34,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,083 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-21 19:53:34,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:34,114 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-07-21 19:53:34,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:34,114 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:34,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:34,117 INFO L225 Difference]: With dead ends: 165 [2020-07-21 19:53:34,118 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 19:53:34,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 19:53:34,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-07-21 19:53:34,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 19:53:34,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-07-21 19:53:34,138 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-07-21 19:53:34,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:34,139 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-07-21 19:53:34,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:34,139 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-07-21 19:53:34,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:34,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:34,146 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:34,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:34,362 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:34,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:34,363 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-07-21 19:53:34,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:34,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417948012] [2020-07-21 19:53:34,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:34,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:34,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:34,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:34,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:34,427 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 19:53:34,428 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:34,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417948012] [2020-07-21 19:53:34,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:34,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:34,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878705322] [2020-07-21 19:53:34,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:34,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:34,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:34,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,432 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-07-21 19:53:34,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:34,477 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-07-21 19:53:34,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:34,479 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:34,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:34,483 INFO L225 Difference]: With dead ends: 204 [2020-07-21 19:53:34,484 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 19:53:34,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 19:53:34,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-07-21 19:53:34,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 19:53:34,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-21 19:53:34,538 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-21 19:53:34,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:34,539 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-21 19:53:34,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:34,539 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-21 19:53:34,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:34,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:34,545 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:34,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:34,749 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:34,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:34,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-21 19:53:34,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:34,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447730401] [2020-07-21 19:53:34,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:34,813 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:34,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:34,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:34,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:34,835 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 19:53:34,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:34,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447730401] [2020-07-21 19:53:34,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:34,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:34,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701501742] [2020-07-21 19:53:34,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:34,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:34,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:34,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,844 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-21 19:53:34,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:34,921 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-21 19:53:34,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:34,923 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:34,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:34,930 INFO L225 Difference]: With dead ends: 352 [2020-07-21 19:53:34,931 INFO L226 Difference]: Without dead ends: 210 [2020-07-21 19:53:34,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:34,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-21 19:53:35,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-21 19:53:35,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 19:53:35,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-21 19:53:35,025 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-21 19:53:35,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:35,026 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-21 19:53:35,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:35,028 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-21 19:53:35,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:35,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:35,037 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:35,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:35,253 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:35,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:35,254 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-21 19:53:35,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:35,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1528777582] [2020-07-21 19:53:35,257 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:35,318 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:35,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:35,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:35,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:35,343 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 19:53:35,344 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:35,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1528777582] [2020-07-21 19:53:35,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:35,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:35,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877719515] [2020-07-21 19:53:35,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:35,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:35,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:35,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:35,349 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-21 19:53:35,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:35,388 INFO L93 Difference]: Finished difference Result 376 states and 620 transitions. [2020-07-21 19:53:35,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:35,390 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:35,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:35,395 INFO L225 Difference]: With dead ends: 376 [2020-07-21 19:53:35,396 INFO L226 Difference]: Without dead ends: 374 [2020-07-21 19:53:35,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:35,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2020-07-21 19:53:35,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 292. [2020-07-21 19:53:35,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 19:53:35,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 466 transitions. [2020-07-21 19:53:35,423 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 466 transitions. Word has length 21 [2020-07-21 19:53:35,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:35,424 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 466 transitions. [2020-07-21 19:53:35,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:35,424 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 466 transitions. [2020-07-21 19:53:35,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:35,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:35,428 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:35,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:35,644 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:35,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:35,645 INFO L82 PathProgramCache]: Analyzing trace with hash 534158954, now seen corresponding path program 1 times [2020-07-21 19:53:35,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:35,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [386825948] [2020-07-21 19:53:35,648 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:35,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:35,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:35,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:35,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:35,719 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 19:53:35,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:35,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [386825948] [2020-07-21 19:53:35,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:35,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:35,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493660660] [2020-07-21 19:53:35,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:35,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:35,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:35,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:35,728 INFO L87 Difference]: Start difference. First operand 292 states and 466 transitions. Second operand 3 states. [2020-07-21 19:53:35,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:35,766 INFO L93 Difference]: Finished difference Result 436 states and 692 transitions. [2020-07-21 19:53:35,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:35,768 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:35,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:35,771 INFO L225 Difference]: With dead ends: 436 [2020-07-21 19:53:35,772 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 19:53:35,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:35,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 19:53:35,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 296. [2020-07-21 19:53:35,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 19:53:35,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-07-21 19:53:35,811 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-07-21 19:53:35,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:35,812 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-07-21 19:53:35,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:35,813 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-07-21 19:53:35,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:35,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:35,822 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:36,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:36,038 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:36,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:36,039 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-07-21 19:53:36,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:36,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869219307] [2020-07-21 19:53:36,040 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:36,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:36,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:36,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:36,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:36,120 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 19:53:36,121 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:36,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869219307] [2020-07-21 19:53:36,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:36,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:36,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764993886] [2020-07-21 19:53:36,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:36,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:36,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:36,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,125 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-07-21 19:53:36,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:36,174 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-07-21 19:53:36,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:36,175 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:36,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:36,180 INFO L225 Difference]: With dead ends: 684 [2020-07-21 19:53:36,181 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 19:53:36,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 19:53:36,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-07-21 19:53:36,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 19:53:36,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-07-21 19:53:36,210 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-07-21 19:53:36,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:36,211 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-07-21 19:53:36,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:36,212 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-07-21 19:53:36,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:36,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:36,214 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:36,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:36,430 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:36,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:36,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-07-21 19:53:36,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:36,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970588757] [2020-07-21 19:53:36,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:36,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:36,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:36,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:36,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:36,495 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 19:53:36,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:36,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970588757] [2020-07-21 19:53:36,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:36,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:36,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358413426] [2020-07-21 19:53:36,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:36,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:36,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:36,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,501 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-07-21 19:53:36,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:36,540 INFO L93 Difference]: Finished difference Result 708 states and 1104 transitions. [2020-07-21 19:53:36,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:36,541 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:36,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:36,549 INFO L225 Difference]: With dead ends: 708 [2020-07-21 19:53:36,549 INFO L226 Difference]: Without dead ends: 706 [2020-07-21 19:53:36,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2020-07-21 19:53:36,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 576. [2020-07-21 19:53:36,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 19:53:36,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 862 transitions. [2020-07-21 19:53:36,591 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 862 transitions. Word has length 22 [2020-07-21 19:53:36,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:36,591 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 862 transitions. [2020-07-21 19:53:36,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:36,592 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 862 transitions. [2020-07-21 19:53:36,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:36,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:36,595 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:36,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:36,811 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:36,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:36,812 INFO L82 PathProgramCache]: Analyzing trace with hash -764633433, now seen corresponding path program 1 times [2020-07-21 19:53:36,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:36,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400473706] [2020-07-21 19:53:36,814 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:36,864 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:36,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:36,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:36,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:36,891 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 19:53:36,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:36,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400473706] [2020-07-21 19:53:36,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:36,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:36,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733657702] [2020-07-21 19:53:36,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:36,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:36,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:36,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,896 INFO L87 Difference]: Start difference. First operand 576 states and 862 transitions. Second operand 3 states. [2020-07-21 19:53:36,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:36,964 INFO L93 Difference]: Finished difference Result 860 states and 1280 transitions. [2020-07-21 19:53:36,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:36,966 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:36,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:36,971 INFO L225 Difference]: With dead ends: 860 [2020-07-21 19:53:36,972 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 19:53:36,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:36,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 19:53:36,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-21 19:53:37,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 19:53:37,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-07-21 19:53:37,005 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-07-21 19:53:37,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:37,005 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-07-21 19:53:37,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:37,006 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-07-21 19:53:37,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:37,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:37,008 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:37,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:37,225 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:37,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:37,226 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-07-21 19:53:37,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:37,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068686939] [2020-07-21 19:53:37,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:37,269 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:37,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:37,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:37,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:37,289 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 19:53:37,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:37,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068686939] [2020-07-21 19:53:37,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:37,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:37,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455300338] [2020-07-21 19:53:37,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:37,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:37,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:37,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:37,294 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-07-21 19:53:37,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:37,348 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-07-21 19:53:37,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:37,349 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:37,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:37,358 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 19:53:37,358 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 19:53:37,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:37,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 19:53:37,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 19:53:37,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 19:53:37,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-07-21 19:53:37,408 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-07-21 19:53:37,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:37,409 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-07-21 19:53:37,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:37,409 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-07-21 19:53:37,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:53:37,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:37,413 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:37,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:37,629 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:37,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:37,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-07-21 19:53:37,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:37,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647139094] [2020-07-21 19:53:37,630 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:37,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:37,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:37,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:37,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:37,696 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 19:53:37,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:37,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647139094] [2020-07-21 19:53:37,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:37,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:37,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247662952] [2020-07-21 19:53:37,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:37,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:37,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:37,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:37,701 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-07-21 19:53:37,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:37,760 INFO L93 Difference]: Finished difference Result 1340 states and 1944 transitions. [2020-07-21 19:53:37,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:37,761 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:53:37,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:37,772 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 19:53:37,773 INFO L226 Difference]: Without dead ends: 1338 [2020-07-21 19:53:37,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:37,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1338 states. [2020-07-21 19:53:37,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1338 to 1144. [2020-07-21 19:53:37,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1144 states. [2020-07-21 19:53:37,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1590 transitions. [2020-07-21 19:53:37,851 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1590 transitions. Word has length 23 [2020-07-21 19:53:37,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:37,852 INFO L479 AbstractCegarLoop]: Abstraction has 1144 states and 1590 transitions. [2020-07-21 19:53:37,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:37,852 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1590 transitions. [2020-07-21 19:53:37,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:53:37,857 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:37,858 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:38,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:38,074 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:38,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:38,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1922475871, now seen corresponding path program 1 times [2020-07-21 19:53:38,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:38,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074986693] [2020-07-21 19:53:38,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:38,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:38,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:38,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:38,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:38,160 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 19:53:38,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:38,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074986693] [2020-07-21 19:53:38,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:38,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:38,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084792402] [2020-07-21 19:53:38,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:38,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:38,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:38,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:38,165 INFO L87 Difference]: Start difference. First operand 1144 states and 1590 transitions. Second operand 3 states. [2020-07-21 19:53:38,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:38,257 INFO L93 Difference]: Finished difference Result 2620 states and 3640 transitions. [2020-07-21 19:53:38,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:38,259 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:53:38,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:38,273 INFO L225 Difference]: With dead ends: 2620 [2020-07-21 19:53:38,274 INFO L226 Difference]: Without dead ends: 1498 [2020-07-21 19:53:38,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:38,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1498 states. [2020-07-21 19:53:38,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1498 to 1496. [2020-07-21 19:53:38,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1496 states. [2020-07-21 19:53:38,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1496 states to 1496 states and 2022 transitions. [2020-07-21 19:53:38,389 INFO L78 Accepts]: Start accepts. Automaton has 1496 states and 2022 transitions. Word has length 23 [2020-07-21 19:53:38,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:38,390 INFO L479 AbstractCegarLoop]: Abstraction has 1496 states and 2022 transitions. [2020-07-21 19:53:38,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:38,391 INFO L276 IsEmpty]: Start isEmpty. Operand 1496 states and 2022 transitions. [2020-07-21 19:53:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:53:38,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:38,396 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:38,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:38,611 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:38,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:38,612 INFO L82 PathProgramCache]: Analyzing trace with hash -790739848, now seen corresponding path program 1 times [2020-07-21 19:53:38,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:38,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481699568] [2020-07-21 19:53:38,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:38,681 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:38,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:38,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:38,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:38,699 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 19:53:38,700 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:38,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481699568] [2020-07-21 19:53:38,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:38,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:38,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112049051] [2020-07-21 19:53:38,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:38,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:38,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:38,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:38,704 INFO L87 Difference]: Start difference. First operand 1496 states and 2022 transitions. Second operand 3 states. [2020-07-21 19:53:38,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:38,815 INFO L93 Difference]: Finished difference Result 2524 states and 3432 transitions. [2020-07-21 19:53:38,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:38,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:53:38,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:38,841 INFO L225 Difference]: With dead ends: 2524 [2020-07-21 19:53:38,841 INFO L226 Difference]: Without dead ends: 2522 [2020-07-21 19:53:38,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:38,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2522 states. [2020-07-21 19:53:39,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2522 to 2264. [2020-07-21 19:53:39,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2264 states. [2020-07-21 19:53:39,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2264 states to 2264 states and 2982 transitions. [2020-07-21 19:53:39,045 INFO L78 Accepts]: Start accepts. Automaton has 2264 states and 2982 transitions. Word has length 24 [2020-07-21 19:53:39,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:39,046 INFO L479 AbstractCegarLoop]: Abstraction has 2264 states and 2982 transitions. [2020-07-21 19:53:39,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:39,046 INFO L276 IsEmpty]: Start isEmpty. Operand 2264 states and 2982 transitions. [2020-07-21 19:53:39,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:53:39,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:39,057 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:39,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:39,274 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:39,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:39,275 INFO L82 PathProgramCache]: Analyzing trace with hash -89675270, now seen corresponding path program 1 times [2020-07-21 19:53:39,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:39,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800110076] [2020-07-21 19:53:39,276 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:39,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:39,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:39,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:39,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:39,349 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 19:53:39,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:39,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800110076] [2020-07-21 19:53:39,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:39,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:39,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869794411] [2020-07-21 19:53:39,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:39,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:39,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:39,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:39,354 INFO L87 Difference]: Start difference. First operand 2264 states and 2982 transitions. Second operand 3 states. [2020-07-21 19:53:39,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:39,495 INFO L93 Difference]: Finished difference Result 5148 states and 6760 transitions. [2020-07-21 19:53:39,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:39,495 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:53:39,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:39,521 INFO L225 Difference]: With dead ends: 5148 [2020-07-21 19:53:39,521 INFO L226 Difference]: Without dead ends: 2906 [2020-07-21 19:53:39,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:39,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2906 states. [2020-07-21 19:53:39,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2906 to 2904. [2020-07-21 19:53:39,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2904 states. [2020-07-21 19:53:39,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 3686 transitions. [2020-07-21 19:53:39,734 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 3686 transitions. Word has length 24 [2020-07-21 19:53:39,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:39,736 INFO L479 AbstractCegarLoop]: Abstraction has 2904 states and 3686 transitions. [2020-07-21 19:53:39,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:39,736 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 3686 transitions. [2020-07-21 19:53:39,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:53:39,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:39,747 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:39,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:39,964 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:39,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:39,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1257084562, now seen corresponding path program 1 times [2020-07-21 19:53:39,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:39,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423457696] [2020-07-21 19:53:39,967 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:40,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:40,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:40,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:40,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:40,040 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 19:53:40,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:40,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423457696] [2020-07-21 19:53:40,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:40,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:40,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736630754] [2020-07-21 19:53:40,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:40,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:40,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:40,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:40,046 INFO L87 Difference]: Start difference. First operand 2904 states and 3686 transitions. Second operand 3 states. [2020-07-21 19:53:40,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:40,266 INFO L93 Difference]: Finished difference Result 8538 states and 10727 transitions. [2020-07-21 19:53:40,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:40,267 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:53:40,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:40,289 INFO L225 Difference]: With dead ends: 8538 [2020-07-21 19:53:40,290 INFO L226 Difference]: Without dead ends: 2904 [2020-07-21 19:53:40,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:40,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2904 states. [2020-07-21 19:53:40,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2904 to 2904. [2020-07-21 19:53:40,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2904 states. [2020-07-21 19:53:40,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 3430 transitions. [2020-07-21 19:53:40,579 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 3430 transitions. Word has length 25 [2020-07-21 19:53:40,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:40,580 INFO L479 AbstractCegarLoop]: Abstraction has 2904 states and 3430 transitions. [2020-07-21 19:53:40,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:40,580 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 3430 transitions. [2020-07-21 19:53:40,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:53:40,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:40,590 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:40,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:40,806 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:40,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:40,806 INFO L82 PathProgramCache]: Analyzing trace with hash 556019984, now seen corresponding path program 1 times [2020-07-21 19:53:40,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:40,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637978870] [2020-07-21 19:53:40,807 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 19:53:40,847 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:40,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:40,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:40,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:40,868 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 19:53:40,869 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:40,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637978870] [2020-07-21 19:53:40,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:40,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:40,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471433521] [2020-07-21 19:53:40,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:40,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:40,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:40,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:40,872 INFO L87 Difference]: Start difference. First operand 2904 states and 3430 transitions. Second operand 3 states. [2020-07-21 19:53:40,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:40,942 INFO L93 Difference]: Finished difference Result 2904 states and 3430 transitions. [2020-07-21 19:53:40,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:40,943 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:53:40,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:40,944 INFO L225 Difference]: With dead ends: 2904 [2020-07-21 19:53:40,944 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:53:40,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:40,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:53:40,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:53:40,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:53:40,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:53:40,954 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-21 19:53:40,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:40,955 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:53:40,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:40,955 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:53:40,955 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:53:41,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:41,175 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:53:41,287 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:53:41,287 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:41,288 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:41,288 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:53:41,288 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:53:41,288 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:53:41,288 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-21 19:53:41,288 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-21 19:53:41,289 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,289 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-21 19:53:41,289 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,289 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-21 19:53:41,289 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,290 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,290 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-21 19:53:41,290 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-21 19:53:41,290 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-21 19:53:41,290 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-21 19:53:41,291 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-21 19:53:41,291 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,291 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,291 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,291 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,292 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-21 19:53:41,293 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-21 19:53:41,294 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 19:53:41,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:53:41 BoogieIcfgContainer [2020-07-21 19:53:41,317 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:53:41,323 INFO L168 Benchmark]: Toolchain (without parser) took 11235.25 ms. Allocated memory was 143.1 MB in the beginning and 300.9 MB in the end (delta: 157.8 MB). Free memory was 100.2 MB in the beginning and 224.0 MB in the end (delta: -123.8 MB). Peak memory consumption was 34.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:41,324 INFO L168 Benchmark]: CDTParser took 1.56 ms. Allocated memory is still 143.1 MB. Free memory is still 118.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:53:41,324 INFO L168 Benchmark]: CACSL2BoogieTranslator took 429.78 ms. Allocated memory is still 143.1 MB. Free memory was 99.8 MB in the beginning and 89.3 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:41,325 INFO L168 Benchmark]: Boogie Preprocessor took 219.86 ms. Allocated memory was 143.1 MB in the beginning and 200.8 MB in the end (delta: 57.7 MB). Free memory was 89.3 MB in the beginning and 178.2 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:41,326 INFO L168 Benchmark]: RCFGBuilder took 636.32 ms. Allocated memory is still 200.8 MB. Free memory was 178.2 MB in the beginning and 160.8 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:41,326 INFO L168 Benchmark]: TraceAbstraction took 9936.24 ms. Allocated memory was 200.8 MB in the beginning and 300.9 MB in the end (delta: 100.1 MB). Free memory was 160.8 MB in the beginning and 224.0 MB in the end (delta: -63.2 MB). Peak memory consumption was 36.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:41,329 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.56 ms. Allocated memory is still 143.1 MB. Free memory is still 118.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 429.78 ms. Allocated memory is still 143.1 MB. Free memory was 99.8 MB in the beginning and 89.3 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 219.86 ms. Allocated memory was 143.1 MB in the beginning and 200.8 MB in the end (delta: 57.7 MB). Free memory was 89.3 MB in the beginning and 178.2 MB in the end (delta: -88.9 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 636.32 ms. Allocated memory is still 200.8 MB. Free memory was 178.2 MB in the beginning and 160.8 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9936.24 ms. Allocated memory was 200.8 MB in the beginning and 300.9 MB in the end (delta: 100.1 MB). Free memory was 160.8 MB in the beginning and 224.0 MB in the end (delta: -63.2 MB). Peak memory consumption was 36.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.6s, OverallIterations: 20, TraceHistogramMax: 1, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1363 SDtfs, 650 SDslu, 924 SDs, 0 SdLazy, 106 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 406 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2904occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.3s AutomataMinimizationTime, 20 MinimizatonAttempts, 784 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 426 NumberOfCodeBlocks, 325 NumberOfCodeBlocksAsserted, 31 NumberOfCheckSat, 406 ConstructedInterpolants, 0 QuantifiedInterpolants, 15782 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1663 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 20 InterpolantComputations, 20 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...