/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_6.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:49:32,748 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:49:32,779 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:49:32,780 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:49:32,781 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:49:32,783 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:49:32,783 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:49:32,784 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:49:32,786 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:49:32,788 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:49:32,790 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:49:32,791 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:49:32,792 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:49:32,793 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:49:32,796 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:49:32,806 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:49:32,822 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:49:32,823 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:49:32,824 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:49:32,824 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:49:32,824 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:49:32,825 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:49:32,825 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:49:32,826 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:49:32,826 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:49:32,826 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:49:32,829 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:49:32,829 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:49:32,830 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:49:32,830 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:49:32,830 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:49:32,830 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:49:32,830 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:49:32,831 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:49:32,831 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:49:32,831 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:49:32,831 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:49:32,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:32,832 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:49:32,832 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:49:32,832 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 -> 4 [2020-07-20 21:49:33,211 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:49:33,226 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:49:33,230 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:49:33,231 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:49:33,232 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:49:33,233 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_6.c [2020-07-20 21:49:33,304 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a369f7a56/9e77e566cceb45aa9d4401170f680c8b/FLAG30d01c30d [2020-07-20 21:49:33,828 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:49:33,829 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_6.c [2020-07-20 21:49:33,837 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a369f7a56/9e77e566cceb45aa9d4401170f680c8b/FLAG30d01c30d [2020-07-20 21:49:34,145 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a369f7a56/9e77e566cceb45aa9d4401170f680c8b [2020-07-20 21:49:34,158 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:49:34,161 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:49:34,162 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:49:34,162 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:49:34,166 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:49:34,167 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c9bb858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34, skipping insertion in model container [2020-07-20 21:49:34,171 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,180 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:49:34,201 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:49:34,377 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:49:34,381 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:49:34,402 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:49:34,415 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:49:34,416 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34 WrapperNode [2020-07-20 21:49:34,416 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:49:34,417 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:49:34,417 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:49:34,417 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:49:34,430 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,436 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,436 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,441 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,542 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... [2020-07-20 21:49:34,546 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:49:34,547 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:49:34,547 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:49:34,547 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:49:34,548 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:49:34,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:49:34,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:49:34,624 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:49:34,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:49:34,624 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:49:34,625 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:49:34,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:49:34,625 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:49:34,890 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:49:34,890 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 21:49:34,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:34 BoogieIcfgContainer [2020-07-20 21:49:34,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:49:34,897 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:49:34,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:49:34,901 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:49:34,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:49:34" (1/3) ... [2020-07-20 21:49:34,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457f45d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:34, skipping insertion in model container [2020-07-20 21:49:34,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:34" (2/3) ... [2020-07-20 21:49:34,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@457f45d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:34, skipping insertion in model container [2020-07-20 21:49:34,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:34" (3/3) ... [2020-07-20 21:49:34,906 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_6.c [2020-07-20 21:49:34,918 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:49:34,927 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:49:34,947 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:49:35,023 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:49:35,024 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:49:35,024 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:49:35,024 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:49:35,024 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:49:35,024 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:49:35,025 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:49:35,025 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:49:35,058 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-20 21:49:35,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 21:49:35,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:35,072 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:35,073 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:35,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:35,083 INFO L82 PathProgramCache]: Analyzing trace with hash 429652513, now seen corresponding path program 1 times [2020-07-20 21:49:35,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:35,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337675443] [2020-07-20 21:49:35,097 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:35,192 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:35,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:35,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:35,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:35,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:35,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337675443] [2020-07-20 21:49:35,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:35,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:35,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352974345] [2020-07-20 21:49:35,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:35,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:35,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:35,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:35,274 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2020-07-20 21:49:35,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:35,332 INFO L93 Difference]: Finished difference Result 63 states and 102 transitions. [2020-07-20 21:49:35,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:35,335 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 21:49:35,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:35,349 INFO L225 Difference]: With dead ends: 63 [2020-07-20 21:49:35,350 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:49:35,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:35,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:49:35,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2020-07-20 21:49:35,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 21:49:35,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 57 transitions. [2020-07-20 21:49:35,406 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 57 transitions. Word has length 16 [2020-07-20 21:49:35,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:35,407 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 57 transitions. [2020-07-20 21:49:35,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:35,408 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 57 transitions. [2020-07-20 21:49:35,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 21:49:35,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:35,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:35,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:35,624 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:35,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:35,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1109710883, now seen corresponding path program 1 times [2020-07-20 21:49:35,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:35,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81194278] [2020-07-20 21:49:35,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:35,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:35,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:35,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:35,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:35,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:35,689 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:35,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81194278] [2020-07-20 21:49:35,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:35,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:35,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694194762] [2020-07-20 21:49:35,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:35,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:35,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:35,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:35,694 INFO L87 Difference]: Start difference. First operand 34 states and 57 transitions. Second operand 3 states. [2020-07-20 21:49:35,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:35,723 INFO L93 Difference]: Finished difference Result 77 states and 132 transitions. [2020-07-20 21:49:35,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:35,724 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-20 21:49:35,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:35,726 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:49:35,726 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:49:35,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:35,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:49:35,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-07-20 21:49:35,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:49:35,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 77 transitions. [2020-07-20 21:49:35,738 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 77 transitions. Word has length 16 [2020-07-20 21:49:35,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:35,738 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 77 transitions. [2020-07-20 21:49:35,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:35,739 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 77 transitions. [2020-07-20 21:49:35,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:49:35,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:35,740 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:35,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:35,955 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:35,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:35,956 INFO L82 PathProgramCache]: Analyzing trace with hash 434540691, now seen corresponding path program 1 times [2020-07-20 21:49:35,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:35,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875154316] [2020-07-20 21:49:35,958 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:36,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:36,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:36,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:36,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:36,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:36,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875154316] [2020-07-20 21:49:36,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:36,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:36,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60489949] [2020-07-20 21:49:36,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:36,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:36,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:36,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,028 INFO L87 Difference]: Start difference. First operand 46 states and 77 transitions. Second operand 3 states. [2020-07-20 21:49:36,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:36,048 INFO L93 Difference]: Finished difference Result 72 states and 117 transitions. [2020-07-20 21:49:36,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:36,048 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 21:49:36,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:36,050 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:49:36,050 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 21:49:36,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 21:49:36,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-07-20 21:49:36,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 21:49:36,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 79 transitions. [2020-07-20 21:49:36,060 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 79 transitions. Word has length 17 [2020-07-20 21:49:36,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:36,061 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 79 transitions. [2020-07-20 21:49:36,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:36,061 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 79 transitions. [2020-07-20 21:49:36,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:49:36,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:36,062 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:36,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,278 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:36,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:36,279 INFO L82 PathProgramCache]: Analyzing trace with hash 41513681, now seen corresponding path program 1 times [2020-07-20 21:49:36,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:36,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957038632] [2020-07-20 21:49:36,281 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:36,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:36,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:36,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:36,352 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:36,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957038632] [2020-07-20 21:49:36,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:36,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:36,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946494357] [2020-07-20 21:49:36,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:36,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:36,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:36,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,356 INFO L87 Difference]: Start difference. First operand 49 states and 79 transitions. Second operand 3 states. [2020-07-20 21:49:36,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:36,404 INFO L93 Difference]: Finished difference Result 88 states and 144 transitions. [2020-07-20 21:49:36,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:36,407 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 21:49:36,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:36,409 INFO L225 Difference]: With dead ends: 88 [2020-07-20 21:49:36,409 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 21:49:36,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 21:49:36,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2020-07-20 21:49:36,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 21:49:36,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 104 transitions. [2020-07-20 21:49:36,436 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 104 transitions. Word has length 17 [2020-07-20 21:49:36,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:36,436 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 104 transitions. [2020-07-20 21:49:36,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:36,437 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 104 transitions. [2020-07-20 21:49:36,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 21:49:36,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:36,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:36,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,649 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:36,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:36,650 INFO L82 PathProgramCache]: Analyzing trace with hash 721572051, now seen corresponding path program 1 times [2020-07-20 21:49:36,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:36,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644519571] [2020-07-20 21:49:36,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:36,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:36,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:36,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:36,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:36,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:36,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644519571] [2020-07-20 21:49:36,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:36,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:36,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835692211] [2020-07-20 21:49:36,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:36,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:36,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:36,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,720 INFO L87 Difference]: Start difference. First operand 64 states and 104 transitions. Second operand 3 states. [2020-07-20 21:49:36,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:36,755 INFO L93 Difference]: Finished difference Result 144 states and 238 transitions. [2020-07-20 21:49:36,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:36,756 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-20 21:49:36,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:36,758 INFO L225 Difference]: With dead ends: 144 [2020-07-20 21:49:36,758 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:49:36,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:36,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:49:36,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-07-20 21:49:36,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 21:49:36,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 138 transitions. [2020-07-20 21:49:36,776 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 138 transitions. Word has length 17 [2020-07-20 21:49:36,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:36,776 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 138 transitions. [2020-07-20 21:49:36,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:36,777 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 138 transitions. [2020-07-20 21:49:36,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 21:49:36,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:36,778 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:36,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:36,979 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:36,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:36,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1287139128, now seen corresponding path program 1 times [2020-07-20 21:49:36,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:36,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964189279] [2020-07-20 21:49:36,981 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:37,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:37,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:37,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:37,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:37,048 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:37,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964189279] [2020-07-20 21:49:37,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:37,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:37,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846503232] [2020-07-20 21:49:37,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:37,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:37,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:37,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:37,051 INFO L87 Difference]: Start difference. First operand 86 states and 138 transitions. Second operand 3 states. [2020-07-20 21:49:37,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:37,075 INFO L93 Difference]: Finished difference Result 154 states and 250 transitions. [2020-07-20 21:49:37,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:37,076 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 21:49:37,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:37,078 INFO L225 Difference]: With dead ends: 154 [2020-07-20 21:49:37,078 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 21:49:37,079 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 [2020-07-20 21:49:37,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 21:49:37,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 118. [2020-07-20 21:49:37,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-07-20 21:49:37,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 188 transitions. [2020-07-20 21:49:37,092 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 188 transitions. Word has length 18 [2020-07-20 21:49:37,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:37,093 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 188 transitions. [2020-07-20 21:49:37,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:37,093 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 188 transitions. [2020-07-20 21:49:37,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 21:49:37,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:37,095 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:37,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,309 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:37,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:37,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1967197498, now seen corresponding path program 1 times [2020-07-20 21:49:37,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:37,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670280] [2020-07-20 21:49:37,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:37,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:37,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:37,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:37,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:37,365 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:37,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670280] [2020-07-20 21:49:37,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:37,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:37,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193687505] [2020-07-20 21:49:37,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:37,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:37,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:37,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:37,368 INFO L87 Difference]: Start difference. First operand 118 states and 188 transitions. Second operand 3 states. [2020-07-20 21:49:37,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:37,394 INFO L93 Difference]: Finished difference Result 176 states and 278 transitions. [2020-07-20 21:49:37,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:37,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 21:49:37,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:37,396 INFO L225 Difference]: With dead ends: 176 [2020-07-20 21:49:37,396 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 21:49:37,397 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 [2020-07-20 21:49:37,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 21:49:37,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2020-07-20 21:49:37,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 21:49:37,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 186 transitions. [2020-07-20 21:49:37,413 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 186 transitions. Word has length 18 [2020-07-20 21:49:37,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:37,414 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 186 transitions. [2020-07-20 21:49:37,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:37,417 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 186 transitions. [2020-07-20 21:49:37,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 21:49:37,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:37,420 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:37,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,622 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:37,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:37,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1574170488, now seen corresponding path program 1 times [2020-07-20 21:49:37,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:37,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87839602] [2020-07-20 21:49:37,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:37,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:37,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:37,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:37,667 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:37,667 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:37,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87839602] [2020-07-20 21:49:37,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:37,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:37,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685635618] [2020-07-20 21:49:37,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:37,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:37,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:37,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:37,670 INFO L87 Difference]: Start difference. First operand 120 states and 186 transitions. Second operand 3 states. [2020-07-20 21:49:37,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:37,697 INFO L93 Difference]: Finished difference Result 272 states and 424 transitions. [2020-07-20 21:49:37,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:37,700 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 21:49:37,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:37,702 INFO L225 Difference]: With dead ends: 272 [2020-07-20 21:49:37,702 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 21:49:37,703 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 [2020-07-20 21:49:37,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 21:49:37,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2020-07-20 21:49:37,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 21:49:37,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 242 transitions. [2020-07-20 21:49:37,724 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 242 transitions. Word has length 18 [2020-07-20 21:49:37,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:37,724 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 242 transitions. [2020-07-20 21:49:37,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:37,724 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 242 transitions. [2020-07-20 21:49:37,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:49:37,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:37,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:37,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,930 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:37,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:37,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1947887240, now seen corresponding path program 1 times [2020-07-20 21:49:37,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:37,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511289238] [2020-07-20 21:49:37,932 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:37,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:37,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:37,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:37,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:37,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:37,983 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:37,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511289238] [2020-07-20 21:49:37,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:37,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:37,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307377143] [2020-07-20 21:49:37,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:37,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:37,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:37,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:37,986 INFO L87 Difference]: Start difference. First operand 160 states and 242 transitions. Second operand 3 states. [2020-07-20 21:49:38,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:38,018 INFO L93 Difference]: Finished difference Result 280 states and 428 transitions. [2020-07-20 21:49:38,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:38,019 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 21:49:38,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:38,021 INFO L225 Difference]: With dead ends: 280 [2020-07-20 21:49:38,021 INFO L226 Difference]: Without dead ends: 278 [2020-07-20 21:49:38,022 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 [2020-07-20 21:49:38,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-07-20 21:49:38,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 228. [2020-07-20 21:49:38,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2020-07-20 21:49:38,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 338 transitions. [2020-07-20 21:49:38,046 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 338 transitions. Word has length 19 [2020-07-20 21:49:38,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:38,047 INFO L479 AbstractCegarLoop]: Abstraction has 228 states and 338 transitions. [2020-07-20 21:49:38,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:38,047 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 338 transitions. [2020-07-20 21:49:38,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:49:38,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:38,049 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:38,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,259 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:38,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:38,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1667021686, now seen corresponding path program 1 times [2020-07-20 21:49:38,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:38,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323502256] [2020-07-20 21:49:38,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:38,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:38,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:38,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:38,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:38,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323502256] [2020-07-20 21:49:38,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:38,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:38,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903891294] [2020-07-20 21:49:38,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:38,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:38,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:38,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:38,302 INFO L87 Difference]: Start difference. First operand 228 states and 338 transitions. Second operand 3 states. [2020-07-20 21:49:38,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:38,320 INFO L93 Difference]: Finished difference Result 340 states and 500 transitions. [2020-07-20 21:49:38,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:38,321 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 21:49:38,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:38,323 INFO L225 Difference]: With dead ends: 340 [2020-07-20 21:49:38,323 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 21:49:38,324 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 [2020-07-20 21:49:38,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 21:49:38,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2020-07-20 21:49:38,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 21:49:38,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 334 transitions. [2020-07-20 21:49:38,336 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 334 transitions. Word has length 19 [2020-07-20 21:49:38,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:38,336 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 334 transitions. [2020-07-20 21:49:38,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:38,337 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 334 transitions. [2020-07-20 21:49:38,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:49:38,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:38,338 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:49:38,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,552 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:38,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:38,553 INFO L82 PathProgramCache]: Analyzing trace with hash -2060048696, now seen corresponding path program 1 times [2020-07-20 21:49:38,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:38,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240460969] [2020-07-20 21:49:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:38,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:38,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:38,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:38,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:38,618 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:38,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240460969] [2020-07-20 21:49:38,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:38,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:38,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943161659] [2020-07-20 21:49:38,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:38,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:38,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:38,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:38,620 INFO L87 Difference]: Start difference. First operand 232 states and 334 transitions. Second operand 3 states. [2020-07-20 21:49:38,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:38,654 INFO L93 Difference]: Finished difference Result 524 states and 752 transitions. [2020-07-20 21:49:38,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:38,654 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 21:49:38,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:38,657 INFO L225 Difference]: With dead ends: 524 [2020-07-20 21:49:38,657 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 21:49:38,658 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 [2020-07-20 21:49:38,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 21:49:38,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 304. [2020-07-20 21:49:38,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 21:49:38,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 422 transitions. [2020-07-20 21:49:38,671 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 422 transitions. Word has length 19 [2020-07-20 21:49:38,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:38,672 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 422 transitions. [2020-07-20 21:49:38,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:38,672 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 422 transitions. [2020-07-20 21:49:38,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:49:38,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:38,673 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] [2020-07-20 21:49:38,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,887 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:38,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:38,888 INFO L82 PathProgramCache]: Analyzing trace with hash 956242573, now seen corresponding path program 1 times [2020-07-20 21:49:38,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:38,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038260148] [2020-07-20 21:49:38,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:38,917 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:38,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:38,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:38,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:38,934 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:38,937 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:38,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038260148] [2020-07-20 21:49:38,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:38,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:38,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512989789] [2020-07-20 21:49:38,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:38,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:38,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:38,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:38,940 INFO L87 Difference]: Start difference. First operand 304 states and 422 transitions. Second operand 3 states. [2020-07-20 21:49:38,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:38,967 INFO L93 Difference]: Finished difference Result 516 states and 720 transitions. [2020-07-20 21:49:38,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:38,968 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 21:49:38,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:38,974 INFO L225 Difference]: With dead ends: 516 [2020-07-20 21:49:38,974 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 21:49:38,975 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 [2020-07-20 21:49:38,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 21:49:38,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 448. [2020-07-20 21:49:38,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 448 states. [2020-07-20 21:49:38,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 606 transitions. [2020-07-20 21:49:38,995 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 606 transitions. Word has length 20 [2020-07-20 21:49:38,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:38,996 INFO L479 AbstractCegarLoop]: Abstraction has 448 states and 606 transitions. [2020-07-20 21:49:38,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:38,996 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 606 transitions. [2020-07-20 21:49:38,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:49:38,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:38,998 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] [2020-07-20 21:49:39,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,212 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:39,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:39,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1636300943, now seen corresponding path program 1 times [2020-07-20 21:49:39,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:39,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785547608] [2020-07-20 21:49:39,214 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:39,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:39,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:39,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:39,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:39,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:39,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785547608] [2020-07-20 21:49:39,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:39,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:39,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32367252] [2020-07-20 21:49:39,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:39,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:39,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:39,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:39,269 INFO L87 Difference]: Start difference. First operand 448 states and 606 transitions. Second operand 3 states. [2020-07-20 21:49:39,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:39,296 INFO L93 Difference]: Finished difference Result 668 states and 896 transitions. [2020-07-20 21:49:39,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:39,297 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 21:49:39,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:39,300 INFO L225 Difference]: With dead ends: 668 [2020-07-20 21:49:39,301 INFO L226 Difference]: Without dead ends: 458 [2020-07-20 21:49:39,301 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 [2020-07-20 21:49:39,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-07-20 21:49:39,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 456. [2020-07-20 21:49:39,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-20 21:49:39,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 598 transitions. [2020-07-20 21:49:39,320 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 598 transitions. Word has length 20 [2020-07-20 21:49:39,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:39,320 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 598 transitions. [2020-07-20 21:49:39,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:39,320 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 598 transitions. [2020-07-20 21:49:39,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:49:39,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:39,322 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] [2020-07-20 21:49:39,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,539 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:39,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:39,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1243273933, now seen corresponding path program 1 times [2020-07-20 21:49:39,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:39,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5565753] [2020-07-20 21:49:39,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:49:39,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:39,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:39,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:39,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:39,599 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:39,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5565753] [2020-07-20 21:49:39,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:39,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:39,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089443501] [2020-07-20 21:49:39,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:39,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:39,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:39,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:39,606 INFO L87 Difference]: Start difference. First operand 456 states and 598 transitions. Second operand 3 states. [2020-07-20 21:49:39,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:39,643 INFO L93 Difference]: Finished difference Result 1020 states and 1320 transitions. [2020-07-20 21:49:39,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:39,644 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 21:49:39,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:39,647 INFO L225 Difference]: With dead ends: 1020 [2020-07-20 21:49:39,648 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 21:49:39,649 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 [2020-07-20 21:49:39,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 21:49:39,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-20 21:49:39,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-20 21:49:39,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 726 transitions. [2020-07-20 21:49:39,685 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 726 transitions. Word has length 20 [2020-07-20 21:49:39,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:39,685 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 726 transitions. [2020-07-20 21:49:39,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:39,686 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 726 transitions. [2020-07-20 21:49:39,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:49:39,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:39,687 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] [2020-07-20 21:49:39,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,903 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:39,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:39,904 INFO L82 PathProgramCache]: Analyzing trace with hash 280029309, now seen corresponding path program 1 times [2020-07-20 21:49:39,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:39,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208187478] [2020-07-20 21:49:39,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:39,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:39,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:39,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:39,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:39,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:39,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:39,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208187478] [2020-07-20 21:49:39,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:39,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:39,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614561435] [2020-07-20 21:49:39,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:39,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:39,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:39,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:39,953 INFO L87 Difference]: Start difference. First operand 584 states and 726 transitions. Second operand 3 states. [2020-07-20 21:49:39,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:39,988 INFO L93 Difference]: Finished difference Result 954 states and 1175 transitions. [2020-07-20 21:49:39,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:39,989 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:49:39,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:39,996 INFO L225 Difference]: With dead ends: 954 [2020-07-20 21:49:39,997 INFO L226 Difference]: Without dead ends: 952 [2020-07-20 21:49:39,999 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 [2020-07-20 21:49:40,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 952 states. [2020-07-20 21:49:40,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 952 to 888. [2020-07-20 21:49:40,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 888 states. [2020-07-20 21:49:40,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1078 transitions. [2020-07-20 21:49:40,036 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1078 transitions. Word has length 21 [2020-07-20 21:49:40,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:40,037 INFO L479 AbstractCegarLoop]: Abstraction has 888 states and 1078 transitions. [2020-07-20 21:49:40,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:40,037 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1078 transitions. [2020-07-20 21:49:40,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 21:49:40,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:49:40,040 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] [2020-07-20 21:49:40,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:40,247 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:49:40,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:49:40,248 INFO L82 PathProgramCache]: Analyzing trace with hash 960087679, now seen corresponding path program 1 times [2020-07-20 21:49:40,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:49:40,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436776600] [2020-07-20 21:49:40,249 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:40,276 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:49:40,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:49:40,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 21:49:40,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:49:40,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:49:40,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:49:40,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436776600] [2020-07-20 21:49:40,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:49:40,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 21:49:40,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324254095] [2020-07-20 21:49:40,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 21:49:40,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:49:40,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 21:49:40,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 21:49:40,294 INFO L87 Difference]: Start difference. First operand 888 states and 1078 transitions. Second operand 3 states. [2020-07-20 21:49:40,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:49:40,355 INFO L93 Difference]: Finished difference Result 1976 states and 2358 transitions. [2020-07-20 21:49:40,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 21:49:40,355 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 21:49:40,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:49:40,356 INFO L225 Difference]: With dead ends: 1976 [2020-07-20 21:49:40,356 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:49:40,360 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 [2020-07-20 21:49:40,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:49:40,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:49:40,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:49:40,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:49:40,361 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2020-07-20 21:49:40,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:49:40,362 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:49:40,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 21:49:40,362 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:49:40,362 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:49:40,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:49:40,582 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:49:40,664 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:49:40,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:49:40,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:49:40,665 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:49:40,665 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:49:40,665 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:49:40,666 INFO L268 CegarLoopResult]: For program point L93(line 93) no Hoare annotation was computed. [2020-07-20 21:49:40,666 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 107) no Hoare annotation was computed. [2020-07-20 21:49:40,666 INFO L268 CegarLoopResult]: For program point L77-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,666 INFO L268 CegarLoopResult]: For program point L78(line 78) no Hoare annotation was computed. [2020-07-20 21:49:40,667 INFO L271 CegarLoopResult]: At program point L103(lines 5 107) the Hoare annotation is: true [2020-07-20 21:49:40,667 INFO L268 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-07-20 21:49:40,667 INFO L268 CegarLoopResult]: For program point L62-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,667 INFO L268 CegarLoopResult]: For program point L87-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,667 INFO L268 CegarLoopResult]: For program point L54-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,668 INFO L268 CegarLoopResult]: For program point L46(lines 46 48) no Hoare annotation was computed. [2020-07-20 21:49:40,668 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 107) no Hoare annotation was computed. [2020-07-20 21:49:40,668 INFO L268 CegarLoopResult]: For program point L46-2(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,668 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 105) no Hoare annotation was computed. [2020-07-20 21:49:40,668 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 107) the Hoare annotation is: true [2020-07-20 21:49:40,669 INFO L268 CegarLoopResult]: For program point L88(line 88) no Hoare annotation was computed. [2020-07-20 21:49:40,669 INFO L268 CegarLoopResult]: For program point L72-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,669 INFO L271 CegarLoopResult]: At program point L97-1(lines 27 102) the Hoare annotation is: true [2020-07-20 21:49:40,669 INFO L268 CegarLoopResult]: For program point L73(line 73) no Hoare annotation was computed. [2020-07-20 21:49:40,669 INFO L268 CegarLoopResult]: For program point L98(line 98) no Hoare annotation was computed. [2020-07-20 21:49:40,669 INFO L264 CegarLoopResult]: At program point L98-1(lines 5 107) the Hoare annotation is: false [2020-07-20 21:49:40,670 INFO L268 CegarLoopResult]: For program point L82-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,670 INFO L268 CegarLoopResult]: For program point L66-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,670 INFO L268 CegarLoopResult]: For program point L58-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,670 INFO L268 CegarLoopResult]: For program point L83(line 83) no Hoare annotation was computed. [2020-07-20 21:49:40,670 INFO L268 CegarLoopResult]: For program point L50-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,671 INFO L268 CegarLoopResult]: For program point L92-1(lines 27 102) no Hoare annotation was computed. [2020-07-20 21:49:40,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:49:40 BoogieIcfgContainer [2020-07-20 21:49:40,687 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:49:40,691 INFO L168 Benchmark]: Toolchain (without parser) took 6529.58 ms. Allocated memory was 136.3 MB in the beginning and 252.2 MB in the end (delta: 115.9 MB). Free memory was 101.0 MB in the beginning and 173.0 MB in the end (delta: -72.0 MB). Peak memory consumption was 43.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,691 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,693 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.49 ms. Allocated memory is still 136.3 MB. Free memory was 100.6 MB in the beginning and 90.6 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,694 INFO L168 Benchmark]: Boogie Preprocessor took 128.94 ms. Allocated memory was 136.3 MB in the beginning and 198.7 MB in the end (delta: 62.4 MB). Free memory was 90.6 MB in the beginning and 177.4 MB in the end (delta: -86.8 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,695 INFO L168 Benchmark]: RCFGBuilder took 349.06 ms. Allocated memory is still 198.7 MB. Free memory was 177.4 MB in the beginning and 161.5 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,696 INFO L168 Benchmark]: TraceAbstraction took 5789.49 ms. Allocated memory was 198.7 MB in the beginning and 252.2 MB in the end (delta: 53.5 MB). Free memory was 160.8 MB in the beginning and 173.0 MB in the end (delta: -12.2 MB). Peak memory consumption was 41.2 MB. Max. memory is 7.1 GB. [2020-07-20 21:49:40,699 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 254.49 ms. Allocated memory is still 136.3 MB. Free memory was 100.6 MB in the beginning and 90.6 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.94 ms. Allocated memory was 136.3 MB in the beginning and 198.7 MB in the end (delta: 62.4 MB). Free memory was 90.6 MB in the beginning and 177.4 MB in the end (delta: -86.8 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 349.06 ms. Allocated memory is still 198.7 MB. Free memory was 177.4 MB in the beginning and 161.5 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5789.49 ms. Allocated memory was 198.7 MB in the beginning and 252.2 MB in the end (delta: 53.5 MB). Free memory was 160.8 MB in the beginning and 173.0 MB in the end (delta: -12.2 MB). Peak memory consumption was 41.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 105]: 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: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5.5s, OverallIterations: 16, TraceHistogramMax: 1, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 870 SDtfs, 391 SDslu, 579 SDs, 0 SdLazy, 86 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 280 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=888occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 268 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 74 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 296 NumberOfCodeBlocks, 208 NumberOfCodeBlocksAsserted, 42 NumberOfCheckSat, 280 ConstructedInterpolants, 0 QuantifiedInterpolants, 8930 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1034 ConjunctsInSsa, 48 ConjunctsInUnsatCore, 16 InterpolantComputations, 16 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...