/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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 [2020-07-21 13:35:49,889 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:35:49,893 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:35:49,914 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 13:35:49,932 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:35:49,934 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:35:49,935 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:35:49,938 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:35:49,939 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:35:49,940 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:35:49,945 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:35:49,952 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:35:49,955 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:35:49,957 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:35:49,960 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:35:49,962 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:35:49,966 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:35:49,981 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:35:49,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:35:49,984 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:35:49,986 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 13:35:50,009 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:35:50,009 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:35:50,012 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:35:50,012 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:35:50,012 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:35:50,013 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:35:50,013 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:35:50,013 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:35:50,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:35:50,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:35:50,014 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:35:50,014 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:35:50,015 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:35:50,015 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:35:50,015 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:35:50,016 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:35:50,016 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:35:50,016 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:35:50,017 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:35:50,017 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:35:50,017 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:35:50,018 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:50,018 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:35:50,018 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:35:50,019 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:35:50,019 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:35:50,019 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:50,019 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:35:50,019 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:35:50,020 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:35:50,511 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:35:50,535 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:35:50,542 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:35:50,544 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:35:50,545 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:35:50,546 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_6.c [2020-07-21 13:35:50,672 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0afc851e2/5bab68c839db4f66832814c597d36323/FLAGec487173e [2020-07-21 13:35:51,413 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:35:51,415 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_6.c [2020-07-21 13:35:51,431 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0afc851e2/5bab68c839db4f66832814c597d36323/FLAGec487173e [2020-07-21 13:35:51,733 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0afc851e2/5bab68c839db4f66832814c597d36323 [2020-07-21 13:35:51,755 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:35:51,761 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:35:51,765 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:51,766 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:35:51,772 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:35:51,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d07b4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:51, skipping insertion in model container [2020-07-21 13:35:51,781 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:35:51" (1/1) ... [2020-07-21 13:35:51,795 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:35:51,833 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:35:52,328 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:52,344 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:35:52,432 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:35:52,463 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:35:52,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52 WrapperNode [2020-07-21 13:35:52,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:35:52,470 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:35:52,471 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:35:52,471 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:35:52,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,640 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,652 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,653 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,660 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,672 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,675 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... [2020-07-21 13:35:52,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:35:52,680 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:35:52,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:35:52,680 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:35:52,683 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:35:52,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:35:52,814 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:35:52,814 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:35:52,814 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:35:52,815 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:35:52,815 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:35:52,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:35:52,816 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:35:53,232 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:35:53,233 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 13:35:53,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:53 BoogieIcfgContainer [2020-07-21 13:35:53,241 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:35:53,243 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:35:53,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:35:53,250 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:35:53,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:35:51" (1/3) ... [2020-07-21 13:35:53,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@700ca525 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:53, skipping insertion in model container [2020-07-21 13:35:53,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:35:52" (2/3) ... [2020-07-21 13:35:53,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@700ca525 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:35:53, skipping insertion in model container [2020-07-21 13:35:53,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:35:53" (3/3) ... [2020-07-21 13:35:53,257 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_6.c [2020-07-21 13:35:53,298 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:35:53,336 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:35:53,407 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:35:53,483 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:35:53,484 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:35:53,484 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:35:53,484 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:35:53,484 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:35:53,484 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:35:53,485 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:35:53,485 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:35:53,526 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-21 13:35:53,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 13:35:53,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:53,540 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:53,542 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:53,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:53,553 INFO L82 PathProgramCache]: Analyzing trace with hash 429652513, now seen corresponding path program 1 times [2020-07-21 13:35:53,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:53,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463824478] [2020-07-21 13:35:53,577 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:53,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:53,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:53,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:53,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:53,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:53,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:53,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463824478] [2020-07-21 13:35:53,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:53,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:53,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73479935] [2020-07-21 13:35:53,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:53,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:53,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:53,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:53,843 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2020-07-21 13:35:53,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:53,929 INFO L93 Difference]: Finished difference Result 63 states and 102 transitions. [2020-07-21 13:35:53,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:53,933 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 13:35:53,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:53,950 INFO L225 Difference]: With dead ends: 63 [2020-07-21 13:35:53,951 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:35:53,957 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 [2020-07-21 13:35:53,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:35:54,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2020-07-21 13:35:54,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 13:35:54,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 57 transitions. [2020-07-21 13:35:54,020 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 57 transitions. Word has length 16 [2020-07-21 13:35:54,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,021 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 57 transitions. [2020-07-21 13:35:54,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,021 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 57 transitions. [2020-07-21 13:35:54,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 13:35:54,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:54,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,236 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:54,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:54,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1109710883, now seen corresponding path program 1 times [2020-07-21 13:35:54,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:54,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [974419086] [2020-07-21 13:35:54,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:54,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:54,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:54,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:54,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:54,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:54,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [974419086] [2020-07-21 13:35:54,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:54,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:54,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198275712] [2020-07-21 13:35:54,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:54,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:54,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:54,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,356 INFO L87 Difference]: Start difference. First operand 34 states and 57 transitions. Second operand 3 states. [2020-07-21 13:35:54,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:54,397 INFO L93 Difference]: Finished difference Result 77 states and 132 transitions. [2020-07-21 13:35:54,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:54,399 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 13:35:54,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:54,402 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:35:54,403 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:35:54,405 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 [2020-07-21 13:35:54,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:35:54,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-07-21 13:35:54,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:35:54,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 77 transitions. [2020-07-21 13:35:54,420 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 77 transitions. Word has length 16 [2020-07-21 13:35:54,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,421 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 77 transitions. [2020-07-21 13:35:54,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,421 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 77 transitions. [2020-07-21 13:35:54,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 13:35:54,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,423 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:54,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,632 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:54,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:54,634 INFO L82 PathProgramCache]: Analyzing trace with hash 434540691, now seen corresponding path program 1 times [2020-07-21 13:35:54,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:54,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143763037] [2020-07-21 13:35:54,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:54,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:54,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:54,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:54,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:54,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:54,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:54,730 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143763037] [2020-07-21 13:35:54,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:54,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:54,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912013980] [2020-07-21 13:35:54,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:54,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:54,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:54,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:54,733 INFO L87 Difference]: Start difference. First operand 46 states and 77 transitions. Second operand 3 states. [2020-07-21 13:35:54,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:54,782 INFO L93 Difference]: Finished difference Result 72 states and 117 transitions. [2020-07-21 13:35:54,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:54,787 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 13:35:54,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:54,789 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:35:54,791 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 13:35:54,793 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 [2020-07-21 13:35:54,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 13:35:54,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-07-21 13:35:54,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 13:35:54,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 79 transitions. [2020-07-21 13:35:54,824 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 79 transitions. Word has length 17 [2020-07-21 13:35:54,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:54,827 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 79 transitions. [2020-07-21 13:35:54,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:54,827 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 79 transitions. [2020-07-21 13:35:54,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 13:35:54,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:54,830 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,048 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,049 INFO L82 PathProgramCache]: Analyzing trace with hash 41513681, now seen corresponding path program 1 times [2020-07-21 13:35:55,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497476752] [2020-07-21 13:35:55,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:55,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:55,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1497476752] [2020-07-21 13:35:55,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883902321] [2020-07-21 13:35:55,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,143 INFO L87 Difference]: Start difference. First operand 49 states and 79 transitions. Second operand 3 states. [2020-07-21 13:35:55,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,198 INFO L93 Difference]: Finished difference Result 88 states and 144 transitions. [2020-07-21 13:35:55,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,200 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 13:35:55,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,203 INFO L225 Difference]: With dead ends: 88 [2020-07-21 13:35:55,203 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 13:35:55,204 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 [2020-07-21 13:35:55,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 13:35:55,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2020-07-21 13:35:55,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 13:35:55,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 104 transitions. [2020-07-21 13:35:55,221 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 104 transitions. Word has length 17 [2020-07-21 13:35:55,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,222 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 104 transitions. [2020-07-21 13:35:55,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,223 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 104 transitions. [2020-07-21 13:35:55,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 13:35:55,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,226 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,442 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,444 INFO L82 PathProgramCache]: Analyzing trace with hash 721572051, now seen corresponding path program 1 times [2020-07-21 13:35:55,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1624416365] [2020-07-21 13:35:55,445 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:55,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:55,532 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1624416365] [2020-07-21 13:35:55,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362519892] [2020-07-21 13:35:55,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,537 INFO L87 Difference]: Start difference. First operand 64 states and 104 transitions. Second operand 3 states. [2020-07-21 13:35:55,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,572 INFO L93 Difference]: Finished difference Result 144 states and 238 transitions. [2020-07-21 13:35:55,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,574 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 13:35:55,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,576 INFO L225 Difference]: With dead ends: 144 [2020-07-21 13:35:55,577 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 13:35:55,579 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 [2020-07-21 13:35:55,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 13:35:55,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-07-21 13:35:55,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 13:35:55,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 138 transitions. [2020-07-21 13:35:55,597 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 138 transitions. Word has length 17 [2020-07-21 13:35:55,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,598 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 138 transitions. [2020-07-21 13:35:55,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,598 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 138 transitions. [2020-07-21 13:35:55,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:55,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,601 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:55,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,816 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1287139128, now seen corresponding path program 1 times [2020-07-21 13:35:55,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:55,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127822490] [2020-07-21 13:35:55,819 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:55,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:55,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:55,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:55,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:55,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:55,915 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:55,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127822490] [2020-07-21 13:35:55,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:55,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:55,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296888181] [2020-07-21 13:35:55,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:55,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:55,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:55,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,920 INFO L87 Difference]: Start difference. First operand 86 states and 138 transitions. Second operand 3 states. [2020-07-21 13:35:55,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:55,949 INFO L93 Difference]: Finished difference Result 129 states and 205 transitions. [2020-07-21 13:35:55,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:55,950 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:55,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:55,954 INFO L225 Difference]: With dead ends: 129 [2020-07-21 13:35:55,954 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 13:35:55,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:55,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 13:35:55,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-07-21 13:35:55,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-21 13:35:55,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 138 transitions. [2020-07-21 13:35:55,978 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 138 transitions. Word has length 18 [2020-07-21 13:35:55,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:55,979 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 138 transitions. [2020-07-21 13:35:55,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:55,981 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 138 transitions. [2020-07-21 13:35:55,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:55,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:55,983 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:56,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,191 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,192 INFO L82 PathProgramCache]: Analyzing trace with hash 894112118, now seen corresponding path program 1 times [2020-07-21 13:35:56,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198739805] [2020-07-21 13:35:56,195 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:56,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:56,250 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198739805] [2020-07-21 13:35:56,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008903215] [2020-07-21 13:35:56,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:56,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:56,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:56,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,254 INFO L87 Difference]: Start difference. First operand 88 states and 138 transitions. Second operand 3 states. [2020-07-21 13:35:56,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:56,296 INFO L93 Difference]: Finished difference Result 156 states and 248 transitions. [2020-07-21 13:35:56,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:56,297 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:56,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:56,301 INFO L225 Difference]: With dead ends: 156 [2020-07-21 13:35:56,301 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 13:35:56,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 13:35:56,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 120. [2020-07-21 13:35:56,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 13:35:56,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 186 transitions. [2020-07-21 13:35:56,331 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 186 transitions. Word has length 18 [2020-07-21 13:35:56,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:56,332 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 186 transitions. [2020-07-21 13:35:56,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:56,332 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 186 transitions. [2020-07-21 13:35:56,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:35:56,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:56,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:56,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,549 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1574170488, now seen corresponding path program 1 times [2020-07-21 13:35:56,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408913092] [2020-07-21 13:35:56,552 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:56,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:56,616 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408913092] [2020-07-21 13:35:56,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365533216] [2020-07-21 13:35:56,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:56,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:56,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:56,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,622 INFO L87 Difference]: Start difference. First operand 120 states and 186 transitions. Second operand 3 states. [2020-07-21 13:35:56,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:56,673 INFO L93 Difference]: Finished difference Result 272 states and 424 transitions. [2020-07-21 13:35:56,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:56,676 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:35:56,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:56,679 INFO L225 Difference]: With dead ends: 272 [2020-07-21 13:35:56,679 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 13:35:56,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:56,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 13:35:56,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2020-07-21 13:35:56,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 13:35:56,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 242 transitions. [2020-07-21 13:35:56,717 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 242 transitions. Word has length 18 [2020-07-21 13:35:56,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:56,718 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 242 transitions. [2020-07-21 13:35:56,718 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:56,718 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 242 transitions. [2020-07-21 13:35:56,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:56,720 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:56,721 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:56,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,928 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:56,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:56,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1947887240, now seen corresponding path program 1 times [2020-07-21 13:35:56,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:56,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107692553] [2020-07-21 13:35:56,930 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:56,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:56,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:56,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:56,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:56,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:56,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:56,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107692553] [2020-07-21 13:35:56,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:56,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:56,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853174786] [2020-07-21 13:35:57,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,004 INFO L87 Difference]: Start difference. First operand 160 states and 242 transitions. Second operand 3 states. [2020-07-21 13:35:57,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,051 INFO L93 Difference]: Finished difference Result 280 states and 428 transitions. [2020-07-21 13:35:57,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,054 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:57,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,057 INFO L225 Difference]: With dead ends: 280 [2020-07-21 13:35:57,067 INFO L226 Difference]: Without dead ends: 278 [2020-07-21 13:35:57,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-07-21 13:35:57,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 228. [2020-07-21 13:35:57,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2020-07-21 13:35:57,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 338 transitions. [2020-07-21 13:35:57,123 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 338 transitions. Word has length 19 [2020-07-21 13:35:57,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:57,124 INFO L479 AbstractCegarLoop]: Abstraction has 228 states and 338 transitions. [2020-07-21 13:35:57,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:57,125 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 338 transitions. [2020-07-21 13:35:57,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:57,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:57,138 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:57,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,341 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:57,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:57,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1667021686, now seen corresponding path program 1 times [2020-07-21 13:35:57,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:57,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527492232] [2020-07-21 13:35:57,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:57,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:57,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:57,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:57,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:57,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:57,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527492232] [2020-07-21 13:35:57,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:57,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:57,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400778961] [2020-07-21 13:35:57,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,412 INFO L87 Difference]: Start difference. First operand 228 states and 338 transitions. Second operand 3 states. [2020-07-21 13:35:57,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,446 INFO L93 Difference]: Finished difference Result 340 states and 500 transitions. [2020-07-21 13:35:57,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,448 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:57,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,454 INFO L225 Difference]: With dead ends: 340 [2020-07-21 13:35:57,455 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 13:35:57,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 13:35:57,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2020-07-21 13:35:57,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 13:35:57,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 334 transitions. [2020-07-21 13:35:57,479 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 334 transitions. Word has length 19 [2020-07-21 13:35:57,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:57,479 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 334 transitions. [2020-07-21 13:35:57,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:57,479 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 334 transitions. [2020-07-21 13:35:57,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:35:57,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:57,482 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:57,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,702 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:57,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:57,703 INFO L82 PathProgramCache]: Analyzing trace with hash -2060048696, now seen corresponding path program 1 times [2020-07-21 13:35:57,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:57,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506018603] [2020-07-21 13:35:57,706 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:57,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:57,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:57,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:57,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:57,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:57,771 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:57,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506018603] [2020-07-21 13:35:57,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:57,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:57,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704437468] [2020-07-21 13:35:57,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:57,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:57,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:57,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,775 INFO L87 Difference]: Start difference. First operand 232 states and 334 transitions. Second operand 3 states. [2020-07-21 13:35:57,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:57,810 INFO L93 Difference]: Finished difference Result 524 states and 752 transitions. [2020-07-21 13:35:57,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:57,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:35:57,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:57,814 INFO L225 Difference]: With dead ends: 524 [2020-07-21 13:35:57,815 INFO L226 Difference]: Without dead ends: 306 [2020-07-21 13:35:57,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:57,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-21 13:35:57,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 304. [2020-07-21 13:35:57,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 13:35:57,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 422 transitions. [2020-07-21 13:35:57,841 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 422 transitions. Word has length 19 [2020-07-21 13:35:57,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:57,842 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 422 transitions. [2020-07-21 13:35:57,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:57,842 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 422 transitions. [2020-07-21 13:35:57,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:57,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:57,844 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:58,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,062 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:58,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:58,062 INFO L82 PathProgramCache]: Analyzing trace with hash 956242573, now seen corresponding path program 1 times [2020-07-21 13:35:58,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:58,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535535669] [2020-07-21 13:35:58,063 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,097 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:58,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:58,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:58,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:58,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:58,115 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:58,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535535669] [2020-07-21 13:35:58,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:58,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:58,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561991662] [2020-07-21 13:35:58,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:58,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:58,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:58,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,119 INFO L87 Difference]: Start difference. First operand 304 states and 422 transitions. Second operand 3 states. [2020-07-21 13:35:58,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:58,151 INFO L93 Difference]: Finished difference Result 516 states and 720 transitions. [2020-07-21 13:35:58,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:58,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:58,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:58,157 INFO L225 Difference]: With dead ends: 516 [2020-07-21 13:35:58,157 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 13:35:58,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 13:35:58,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 448. [2020-07-21 13:35:58,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 448 states. [2020-07-21 13:35:58,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 606 transitions. [2020-07-21 13:35:58,186 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 606 transitions. Word has length 20 [2020-07-21 13:35:58,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,187 INFO L479 AbstractCegarLoop]: Abstraction has 448 states and 606 transitions. [2020-07-21 13:35:58,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,187 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 606 transitions. [2020-07-21 13:35:58,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:58,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,189 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:58,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,405 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:58,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:58,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1636300943, now seen corresponding path program 1 times [2020-07-21 13:35:58,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:58,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339385158] [2020-07-21 13:35:58,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:58,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:58,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:58,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:58,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:58,474 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:58,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339385158] [2020-07-21 13:35:58,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:58,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:58,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320617823] [2020-07-21 13:35:58,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:58,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:58,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:58,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,479 INFO L87 Difference]: Start difference. First operand 448 states and 606 transitions. Second operand 3 states. [2020-07-21 13:35:58,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:58,508 INFO L93 Difference]: Finished difference Result 668 states and 896 transitions. [2020-07-21 13:35:58,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:58,509 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:58,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:58,513 INFO L225 Difference]: With dead ends: 668 [2020-07-21 13:35:58,513 INFO L226 Difference]: Without dead ends: 458 [2020-07-21 13:35:58,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-07-21 13:35:58,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 456. [2020-07-21 13:35:58,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-21 13:35:58,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 598 transitions. [2020-07-21 13:35:58,545 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 598 transitions. Word has length 20 [2020-07-21 13:35:58,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,546 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 598 transitions. [2020-07-21 13:35:58,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,546 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 598 transitions. [2020-07-21 13:35:58,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:35:58,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,549 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:58,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,765 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:58,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:58,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1243273933, now seen corresponding path program 1 times [2020-07-21 13:35:58,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:58,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512562189] [2020-07-21 13:35:58,768 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:58,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:58,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:58,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:58,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:58,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:58,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:58,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512562189] [2020-07-21 13:35:58,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:58,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:58,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734067933] [2020-07-21 13:35:58,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:58,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:58,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:58,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,829 INFO L87 Difference]: Start difference. First operand 456 states and 598 transitions. Second operand 3 states. [2020-07-21 13:35:58,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:58,892 INFO L93 Difference]: Finished difference Result 1020 states and 1320 transitions. [2020-07-21 13:35:58,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:58,894 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:35:58,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:58,901 INFO L225 Difference]: With dead ends: 1020 [2020-07-21 13:35:58,902 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 13:35:58,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:58,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 13:35:58,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-21 13:35:58,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 13:35:58,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 726 transitions. [2020-07-21 13:35:58,969 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 726 transitions. Word has length 20 [2020-07-21 13:35:58,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:58,969 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 726 transitions. [2020-07-21 13:35:58,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:58,970 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 726 transitions. [2020-07-21 13:35:58,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:58,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:58,975 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:59,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,189 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:59,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:59,190 INFO L82 PathProgramCache]: Analyzing trace with hash 280029309, now seen corresponding path program 1 times [2020-07-21 13:35:59,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:59,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080583729] [2020-07-21 13:35:59,192 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:35:59,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:59,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:59,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:59,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:59,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:59,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080583729] [2020-07-21 13:35:59,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:59,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:59,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328728466] [2020-07-21 13:35:59,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:59,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:59,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:59,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:59,286 INFO L87 Difference]: Start difference. First operand 584 states and 726 transitions. Second operand 3 states. [2020-07-21 13:35:59,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:59,337 INFO L93 Difference]: Finished difference Result 954 states and 1175 transitions. [2020-07-21 13:35:59,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:59,338 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:59,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:59,348 INFO L225 Difference]: With dead ends: 954 [2020-07-21 13:35:59,349 INFO L226 Difference]: Without dead ends: 952 [2020-07-21 13:35:59,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:59,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 952 states. [2020-07-21 13:35:59,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 952 to 888. [2020-07-21 13:35:59,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 888 states. [2020-07-21 13:35:59,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 888 states to 888 states and 1078 transitions. [2020-07-21 13:35:59,402 INFO L78 Accepts]: Start accepts. Automaton has 888 states and 1078 transitions. Word has length 21 [2020-07-21 13:35:59,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:59,403 INFO L479 AbstractCegarLoop]: Abstraction has 888 states and 1078 transitions. [2020-07-21 13:35:59,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:59,404 INFO L276 IsEmpty]: Start isEmpty. Operand 888 states and 1078 transitions. [2020-07-21 13:35:59,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:59,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:59,407 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:35:59,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,623 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:35:59,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:35:59,624 INFO L82 PathProgramCache]: Analyzing trace with hash 960087679, now seen corresponding path program 1 times [2020-07-21 13:35:59,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:35:59,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812757200] [2020-07-21 13:35:59,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:35:59,664 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:35:59,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:35:59,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:35:59,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:35:59,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:35:59,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:35:59,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812757200] [2020-07-21 13:35:59,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:35:59,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:35:59,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384002760] [2020-07-21 13:35:59,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:35:59,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:35:59,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:35:59,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:59,684 INFO L87 Difference]: Start difference. First operand 888 states and 1078 transitions. Second operand 3 states. [2020-07-21 13:35:59,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:35:59,746 INFO L93 Difference]: Finished difference Result 1324 states and 1592 transitions. [2020-07-21 13:35:59,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:35:59,747 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:35:59,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:35:59,754 INFO L225 Difference]: With dead ends: 1324 [2020-07-21 13:35:59,755 INFO L226 Difference]: Without dead ends: 906 [2020-07-21 13:35:59,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:35:59,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 906 states. [2020-07-21 13:35:59,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 906 to 904. [2020-07-21 13:35:59,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 904 states. [2020-07-21 13:35:59,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1062 transitions. [2020-07-21 13:35:59,821 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1062 transitions. Word has length 21 [2020-07-21 13:35:59,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:35:59,822 INFO L479 AbstractCegarLoop]: Abstraction has 904 states and 1062 transitions. [2020-07-21 13:35:59,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:35:59,822 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1062 transitions. [2020-07-21 13:35:59,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:35:59,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:35:59,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:36:00,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:00,042 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:00,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:00,043 INFO L82 PathProgramCache]: Analyzing trace with hash 567060669, now seen corresponding path program 1 times [2020-07-21 13:36:00,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:00,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270228653] [2020-07-21 13:36:00,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:00,114 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:00,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:00,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:00,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:00,148 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:36:00,149 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:00,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270228653] [2020-07-21 13:36:00,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:00,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:00,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128284008] [2020-07-21 13:36:00,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:00,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:00,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:00,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:00,161 INFO L87 Difference]: Start difference. First operand 904 states and 1062 transitions. Second operand 3 states. [2020-07-21 13:36:00,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:00,237 INFO L93 Difference]: Finished difference Result 1992 states and 2278 transitions. [2020-07-21 13:36:00,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:00,238 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:36:00,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:00,239 INFO L225 Difference]: With dead ends: 1992 [2020-07-21 13:36:00,239 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:36:00,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:00,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:36:00,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:36:00,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:36:00,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:36:00,249 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2020-07-21 13:36:00,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:00,249 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:36:00,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:00,250 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:36:00,250 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:36:00,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:00,470 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:36:00,599 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:36:00,600 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:36:00,600 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:36:00,600 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:36:00,600 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:36:00,601 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:36:00,601 INFO L268 CegarLoopResult]: For program point L93(line 93) no Hoare annotation was computed. [2020-07-21 13:36:00,601 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 107) no Hoare annotation was computed. [2020-07-21 13:36:00,601 INFO L268 CegarLoopResult]: For program point L77-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,602 INFO L268 CegarLoopResult]: For program point L78(line 78) no Hoare annotation was computed. [2020-07-21 13:36:00,602 INFO L271 CegarLoopResult]: At program point L103(lines 5 107) the Hoare annotation is: true [2020-07-21 13:36:00,602 INFO L268 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-07-21 13:36:00,602 INFO L268 CegarLoopResult]: For program point L62-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,602 INFO L268 CegarLoopResult]: For program point L87-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,603 INFO L268 CegarLoopResult]: For program point L54-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,603 INFO L268 CegarLoopResult]: For program point L46(lines 46 48) no Hoare annotation was computed. [2020-07-21 13:36:00,603 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 107) no Hoare annotation was computed. [2020-07-21 13:36:00,603 INFO L268 CegarLoopResult]: For program point L46-2(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,604 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 105) no Hoare annotation was computed. [2020-07-21 13:36:00,604 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 107) the Hoare annotation is: true [2020-07-21 13:36:00,604 INFO L268 CegarLoopResult]: For program point L88(line 88) no Hoare annotation was computed. [2020-07-21 13:36:00,604 INFO L268 CegarLoopResult]: For program point L72-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,605 INFO L271 CegarLoopResult]: At program point L97-1(lines 27 102) the Hoare annotation is: true [2020-07-21 13:36:00,606 INFO L268 CegarLoopResult]: For program point L73(line 73) no Hoare annotation was computed. [2020-07-21 13:36:00,607 INFO L268 CegarLoopResult]: For program point L98(line 98) no Hoare annotation was computed. [2020-07-21 13:36:00,607 INFO L264 CegarLoopResult]: At program point L98-1(lines 5 107) the Hoare annotation is: false [2020-07-21 13:36:00,607 INFO L268 CegarLoopResult]: For program point L82-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,608 INFO L268 CegarLoopResult]: For program point L66-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,608 INFO L268 CegarLoopResult]: For program point L58-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,610 INFO L268 CegarLoopResult]: For program point L83(line 83) no Hoare annotation was computed. [2020-07-21 13:36:00,610 INFO L268 CegarLoopResult]: For program point L50-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,611 INFO L268 CegarLoopResult]: For program point L92-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 13:36:00,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:36:00 BoogieIcfgContainer [2020-07-21 13:36:00,647 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:36:00,657 INFO L168 Benchmark]: Toolchain (without parser) took 8893.82 ms. Allocated memory was 142.6 MB in the beginning and 251.7 MB in the end (delta: 109.1 MB). Free memory was 100.4 MB in the beginning and 145.7 MB in the end (delta: -45.3 MB). Peak memory consumption was 63.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,660 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 142.6 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,661 INFO L168 Benchmark]: CACSL2BoogieTranslator took 701.83 ms. Allocated memory is still 142.6 MB. Free memory was 100.0 MB in the beginning and 89.9 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,662 INFO L168 Benchmark]: Boogie Preprocessor took 209.83 ms. Allocated memory was 142.6 MB in the beginning and 200.8 MB in the end (delta: 58.2 MB). Free memory was 89.9 MB in the beginning and 178.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,663 INFO L168 Benchmark]: RCFGBuilder took 560.96 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 163.2 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,672 INFO L168 Benchmark]: TraceAbstraction took 7404.29 ms. Allocated memory was 200.8 MB in the beginning and 251.7 MB in the end (delta: 50.9 MB). Free memory was 162.5 MB in the beginning and 145.7 MB in the end (delta: 16.8 MB). Peak memory consumption was 67.7 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:00,679 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 142.6 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 701.83 ms. Allocated memory is still 142.6 MB. Free memory was 100.0 MB in the beginning and 89.9 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 209.83 ms. Allocated memory was 142.6 MB in the beginning and 200.8 MB in the end (delta: 58.2 MB). Free memory was 89.9 MB in the beginning and 178.9 MB in the end (delta: -89.0 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 560.96 ms. Allocated memory is still 200.8 MB. Free memory was 178.9 MB in the beginning and 163.2 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7404.29 ms. Allocated memory was 200.8 MB in the beginning and 251.7 MB in the end (delta: 50.9 MB). Free memory was 162.5 MB in the beginning and 145.7 MB in the end (delta: 16.8 MB). Peak memory consumption was 67.7 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: 6.9s, OverallIterations: 17, TraceHistogramMax: 1, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 923 SDtfs, 417 SDslu, 612 SDs, 0 SdLazy, 91 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 300 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=904occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 17 MinimizatonAttempts, 270 StatesRemovedByMinimization, 16 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: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 317 NumberOfCodeBlocks, 279 NumberOfCodeBlocksAsserted, 30 NumberOfCheckSat, 300 ConstructedInterpolants, 0 QuantifiedInterpolants, 9690 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1197 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 17 InterpolantComputations, 17 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...