/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:15:20,635 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:15:20,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:15:20,665 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:15:20,666 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:15:20,674 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:15:20,676 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:15:20,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:15:20,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:15:20,685 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:15:20,685 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:15:20,686 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:15:20,687 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:15:20,689 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:15:20,691 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:15:20,692 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:15:20,693 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:15:20,694 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:15:20,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:15:20,703 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:15:20,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:15:20,706 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:15:20,707 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:15:20,707 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:15:20,719 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 17:15:20,719 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 17:15:20,719 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 17:15:20,722 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 17:15:20,722 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 17:15:20,723 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-18 17:15:20,735 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:15:20,735 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:15:20,736 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:15:20,737 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 17:15:20,778 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:15:20,778 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:15:20,779 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:15:20,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:15:20,780 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:15:20,780 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:15:20,780 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:15:20,780 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:15:20,780 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:15:20,781 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:15:20,781 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:15:20,781 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:15:20,781 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:15:20,781 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:15:20,782 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:15:20,782 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:15:20,782 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:15:20,782 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:15:20,782 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:15:20,783 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:15:20,783 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:15:20,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:15:20,783 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:15:20,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:15:20,783 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:15:20,784 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:15:20,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:15:20,784 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:15:20,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:15:20,784 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:15:21,047 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:15:21,058 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:15:21,061 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:15:21,062 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:15:21,063 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:15:21,063 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 17:15:21,128 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2eb8980ab/65b0676f4fae4b08891f7b5d217c2948/FLAG503a12a09 [2020-08-18 17:15:21,793 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:15:21,794 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 17:15:21,820 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2eb8980ab/65b0676f4fae4b08891f7b5d217c2948/FLAG503a12a09 [2020-08-18 17:15:21,995 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2eb8980ab/65b0676f4fae4b08891f7b5d217c2948 [2020-08-18 17:15:22,003 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:15:22,005 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:15:22,006 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:15:22,006 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:15:22,009 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:15:22,010 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:15:21" (1/1) ... [2020-08-18 17:15:22,013 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d6175b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:22, skipping insertion in model container [2020-08-18 17:15:22,013 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:15:21" (1/1) ... [2020-08-18 17:15:22,020 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:15:22,112 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:15:23,107 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:15:23,126 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:15:23,642 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:15:23,665 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:15:23,666 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23 WrapperNode [2020-08-18 17:15:23,666 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:15:23,667 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:15:23,667 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:15:23,667 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:15:23,677 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,702 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,703 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,756 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,788 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,802 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... [2020-08-18 17:15:23,829 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:15:23,830 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:15:23,830 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:15:23,830 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:15:23,831 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-18 17:15:23,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:15:23,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:15:23,911 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 17:15:23,911 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:15:23,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:15:23,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 17:15:23,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-08-18 17:15:23,912 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 17:15:23,912 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 17:15:23,912 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 17:15:23,912 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 17:15:23,912 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 17:15:23,913 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 17:15:23,913 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 17:15:23,913 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 17:15:23,913 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 17:15:23,913 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 17:15:23,914 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 17:15:23,914 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 17:15:23,914 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:15:23,914 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:15:23,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:15:26,504 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:15:26,504 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 17:15:26,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:15:26 BoogieIcfgContainer [2020-08-18 17:15:26,522 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:15:26,523 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:15:26,523 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:15:26,527 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:15:26,528 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:15:21" (1/3) ... [2020-08-18 17:15:26,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@203b3bc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:15:26, skipping insertion in model container [2020-08-18 17:15:26,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:15:23" (2/3) ... [2020-08-18 17:15:26,529 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@203b3bc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:15:26, skipping insertion in model container [2020-08-18 17:15:26,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:15:26" (3/3) ... [2020-08-18 17:15:26,531 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-08-18 17:15:26,541 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:15:26,550 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:15:26,564 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:15:26,588 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:15:26,588 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:15:26,588 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:15:26,588 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:15:26,588 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:15:26,588 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:15:26,589 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:15:26,589 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:15:26,621 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states. [2020-08-18 17:15:26,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 17:15:26,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:26,652 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:26,653 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:26,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:26,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1078138388, now seen corresponding path program 1 times [2020-08-18 17:15:26,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:26,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475236490] [2020-08-18 17:15:26,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:27,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:28,283 WARN L193 SmtUtils]: Spent 517.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:15:28,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:28,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:28,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:28,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475236490] [2020-08-18 17:15:28,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:28,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:15:28,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443797279] [2020-08-18 17:15:28,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:15:28,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:28,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:15:28,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:15:28,521 INFO L87 Difference]: Start difference. First operand 808 states. Second operand 4 states. [2020-08-18 17:15:28,986 WARN L193 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 17:15:33,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:15:33,707 INFO L93 Difference]: Finished difference Result 1527 states and 2683 transitions. [2020-08-18 17:15:33,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:15:33,709 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 17:15:33,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:15:33,739 INFO L225 Difference]: With dead ends: 1527 [2020-08-18 17:15:33,739 INFO L226 Difference]: Without dead ends: 1311 [2020-08-18 17:15:33,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:15:33,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2020-08-18 17:15:33,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1309. [2020-08-18 17:15:33,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1309 states. [2020-08-18 17:15:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 2040 transitions. [2020-08-18 17:15:33,878 INFO L78 Accepts]: Start accepts. Automaton has 1309 states and 2040 transitions. Word has length 330 [2020-08-18 17:15:33,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:15:33,880 INFO L479 AbstractCegarLoop]: Abstraction has 1309 states and 2040 transitions. [2020-08-18 17:15:33,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:15:33,880 INFO L276 IsEmpty]: Start isEmpty. Operand 1309 states and 2040 transitions. [2020-08-18 17:15:33,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 17:15:33,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:33,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:33,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:15:33,890 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:33,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:33,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1867298226, now seen corresponding path program 1 times [2020-08-18 17:15:33,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:33,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213638650] [2020-08-18 17:15:33,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:34,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:34,736 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:15:34,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:34,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:35,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:35,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213638650] [2020-08-18 17:15:35,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:35,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:15:35,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520647781] [2020-08-18 17:15:35,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:15:35,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:35,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:15:35,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:15:35,143 INFO L87 Difference]: Start difference. First operand 1309 states and 2040 transitions. Second operand 4 states. [2020-08-18 17:15:35,753 WARN L193 SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 17:15:39,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:15:39,906 INFO L93 Difference]: Finished difference Result 2683 states and 4213 transitions. [2020-08-18 17:15:39,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:15:39,908 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 17:15:39,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:15:39,922 INFO L225 Difference]: With dead ends: 2683 [2020-08-18 17:15:39,924 INFO L226 Difference]: Without dead ends: 2301 [2020-08-18 17:15:39,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:15:39,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2301 states. [2020-08-18 17:15:40,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2301 to 2299. [2020-08-18 17:15:40,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2299 states. [2020-08-18 17:15:40,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 3576 transitions. [2020-08-18 17:15:40,014 INFO L78 Accepts]: Start accepts. Automaton has 2299 states and 3576 transitions. Word has length 330 [2020-08-18 17:15:40,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:15:40,016 INFO L479 AbstractCegarLoop]: Abstraction has 2299 states and 3576 transitions. [2020-08-18 17:15:40,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:15:40,016 INFO L276 IsEmpty]: Start isEmpty. Operand 2299 states and 3576 transitions. [2020-08-18 17:15:40,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 17:15:40,025 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:40,028 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:40,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:15:40,029 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:40,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:40,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1297523319, now seen corresponding path program 1 times [2020-08-18 17:15:40,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:40,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557731305] [2020-08-18 17:15:40,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:40,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:40,763 WARN L193 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:15:40,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:40,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:40,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:40,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557731305] [2020-08-18 17:15:40,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:40,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:15:40,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705937684] [2020-08-18 17:15:40,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:15:40,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:40,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:15:40,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:15:40,975 INFO L87 Difference]: Start difference. First operand 2299 states and 3576 transitions. Second operand 4 states. [2020-08-18 17:15:41,384 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification that was a NOOP. DAG size: 278 [2020-08-18 17:15:45,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:15:45,198 INFO L93 Difference]: Finished difference Result 4867 states and 7634 transitions. [2020-08-18 17:15:45,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:15:45,198 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-08-18 17:15:45,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:15:45,219 INFO L225 Difference]: With dead ends: 4867 [2020-08-18 17:15:45,220 INFO L226 Difference]: Without dead ends: 4201 [2020-08-18 17:15:45,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:15:45,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4201 states. [2020-08-18 17:15:45,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4201 to 4199. [2020-08-18 17:15:45,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4199 states. [2020-08-18 17:15:45,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4199 states to 4199 states and 6516 transitions. [2020-08-18 17:15:45,354 INFO L78 Accepts]: Start accepts. Automaton has 4199 states and 6516 transitions. Word has length 330 [2020-08-18 17:15:45,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:15:45,354 INFO L479 AbstractCegarLoop]: Abstraction has 4199 states and 6516 transitions. [2020-08-18 17:15:45,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:15:45,355 INFO L276 IsEmpty]: Start isEmpty. Operand 4199 states and 6516 transitions. [2020-08-18 17:15:45,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-08-18 17:15:45,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:45,366 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:45,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:15:45,367 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:45,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:45,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1852614154, now seen corresponding path program 1 times [2020-08-18 17:15:45,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:45,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408870364] [2020-08-18 17:15:45,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:45,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:46,293 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:15:46,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:46,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:46,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:46,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408870364] [2020-08-18 17:15:46,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:46,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:15:46,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208262793] [2020-08-18 17:15:46,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:15:46,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:46,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:15:46,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:15:46,469 INFO L87 Difference]: Start difference. First operand 4199 states and 6516 transitions. Second operand 5 states. [2020-08-18 17:15:53,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:15:53,002 INFO L93 Difference]: Finished difference Result 12414 states and 19245 transitions. [2020-08-18 17:15:53,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:15:53,003 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 330 [2020-08-18 17:15:53,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:15:53,038 INFO L225 Difference]: With dead ends: 12414 [2020-08-18 17:15:53,038 INFO L226 Difference]: Without dead ends: 8230 [2020-08-18 17:15:53,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:15:53,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8230 states. [2020-08-18 17:15:53,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8230 to 8228. [2020-08-18 17:15:53,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8228 states. [2020-08-18 17:15:53,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8228 states to 8228 states and 12694 transitions. [2020-08-18 17:15:53,343 INFO L78 Accepts]: Start accepts. Automaton has 8228 states and 12694 transitions. Word has length 330 [2020-08-18 17:15:53,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:15:53,344 INFO L479 AbstractCegarLoop]: Abstraction has 8228 states and 12694 transitions. [2020-08-18 17:15:53,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:15:53,345 INFO L276 IsEmpty]: Start isEmpty. Operand 8228 states and 12694 transitions. [2020-08-18 17:15:53,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-08-18 17:15:53,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:15:53,365 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:15:53,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:15:53,366 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:15:53,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:15:53,367 INFO L82 PathProgramCache]: Analyzing trace with hash 569689837, now seen corresponding path program 1 times [2020-08-18 17:15:53,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:15:53,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344600790] [2020-08-18 17:15:53,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:15:53,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:54,066 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:15:54,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:15:54,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:15:54,318 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:15:54,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344600790] [2020-08-18 17:15:54,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:15:54,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:15:54,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187816514] [2020-08-18 17:15:54,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:15:54,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:15:54,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:15:54,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:15:54,321 INFO L87 Difference]: Start difference. First operand 8228 states and 12694 transitions. Second operand 4 states. [2020-08-18 17:16:01,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:16:01,686 INFO L93 Difference]: Finished difference Result 24233 states and 37318 transitions. [2020-08-18 17:16:01,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:16:01,687 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-08-18 17:16:01,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:16:01,740 INFO L225 Difference]: With dead ends: 24233 [2020-08-18 17:16:01,740 INFO L226 Difference]: Without dead ends: 16134 [2020-08-18 17:16:01,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:01,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16134 states. [2020-08-18 17:16:02,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16134 to 16132. [2020-08-18 17:16:02,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16132 states. [2020-08-18 17:16:02,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 24741 transitions. [2020-08-18 17:16:02,195 INFO L78 Accepts]: Start accepts. Automaton has 16132 states and 24741 transitions. Word has length 332 [2020-08-18 17:16:02,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:16:02,196 INFO L479 AbstractCegarLoop]: Abstraction has 16132 states and 24741 transitions. [2020-08-18 17:16:02,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:16:02,196 INFO L276 IsEmpty]: Start isEmpty. Operand 16132 states and 24741 transitions. [2020-08-18 17:16:02,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-08-18 17:16:02,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:16:02,226 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:16:02,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:16:02,227 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:16:02,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:16:02,227 INFO L82 PathProgramCache]: Analyzing trace with hash -310142286, now seen corresponding path program 1 times [2020-08-18 17:16:02,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:16:02,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1199502240] [2020-08-18 17:16:02,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:16:02,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:02,806 WARN L193 SmtUtils]: Spent 459.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:16:02,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:16:02,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:02,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:16:02,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1199502240] [2020-08-18 17:16:02,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:16:02,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:16:02,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413149531] [2020-08-18 17:16:02,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:16:02,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:16:02,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:16:02,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:02,918 INFO L87 Difference]: Start difference. First operand 16132 states and 24741 transitions. Second operand 4 states. [2020-08-18 17:16:10,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:16:10,778 INFO L93 Difference]: Finished difference Result 48321 states and 74099 transitions. [2020-08-18 17:16:10,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:16:10,779 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-08-18 17:16:10,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:16:10,847 INFO L225 Difference]: With dead ends: 48321 [2020-08-18 17:16:10,848 INFO L226 Difference]: Without dead ends: 32231 [2020-08-18 17:16:10,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:11,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32231 states. [2020-08-18 17:16:11,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32231 to 16151. [2020-08-18 17:16:11,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16151 states. [2020-08-18 17:16:11,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16151 states to 16151 states and 24769 transitions. [2020-08-18 17:16:11,632 INFO L78 Accepts]: Start accepts. Automaton has 16151 states and 24769 transitions. Word has length 332 [2020-08-18 17:16:11,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:16:11,632 INFO L479 AbstractCegarLoop]: Abstraction has 16151 states and 24769 transitions. [2020-08-18 17:16:11,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:16:11,633 INFO L276 IsEmpty]: Start isEmpty. Operand 16151 states and 24769 transitions. [2020-08-18 17:16:11,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-08-18 17:16:11,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:16:11,658 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:16:11,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:16:11,659 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:16:11,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:16:11,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1868318850, now seen corresponding path program 1 times [2020-08-18 17:16:11,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:16:11,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930337979] [2020-08-18 17:16:11,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:16:11,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:12,294 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 277 [2020-08-18 17:16:12,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:16:12,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:16:12,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:16:12,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930337979] [2020-08-18 17:16:12,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:16:12,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:16:12,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609563949] [2020-08-18 17:16:12,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:16:12,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:16:12,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:16:12,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:12,405 INFO L87 Difference]: Start difference. First operand 16151 states and 24769 transitions. Second operand 4 states. [2020-08-18 17:16:20,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:16:20,583 INFO L93 Difference]: Finished difference Result 48340 states and 74120 transitions. [2020-08-18 17:16:20,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:16:20,584 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 333 [2020-08-18 17:16:20,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:16:20,657 INFO L225 Difference]: With dead ends: 48340 [2020-08-18 17:16:20,657 INFO L226 Difference]: Without dead ends: 32249 [2020-08-18 17:16:20,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:16:20,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32249 states. [2020-08-18 17:16:22,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32249 to 16169. [2020-08-18 17:16:22,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16169 states. [2020-08-18 17:16:22,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16169 states to 16169 states and 24790 transitions. [2020-08-18 17:16:22,193 INFO L78 Accepts]: Start accepts. Automaton has 16169 states and 24790 transitions. Word has length 333 [2020-08-18 17:16:22,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:16:22,193 INFO L479 AbstractCegarLoop]: Abstraction has 16169 states and 24790 transitions. [2020-08-18 17:16:22,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:16:22,193 INFO L276 IsEmpty]: Start isEmpty. Operand 16169 states and 24790 transitions. [2020-08-18 17:16:22,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-08-18 17:16:22,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:16:22,216 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:16:22,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:16:22,217 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:16:22,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:16:22,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1155788840, now seen corresponding path program 1 times [2020-08-18 17:16:22,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:16:22,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238461324] [2020-08-18 17:16:22,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY