/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:36:32,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:36:32,744 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:36:32,754 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:36:32,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:36:32,755 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:36:32,756 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:36:32,758 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:36:32,760 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:36:32,761 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:36:32,762 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:36:32,763 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:36:32,763 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:36:32,764 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:36:32,765 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:36:32,766 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:36:32,767 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:36:32,768 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:36:32,769 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:36:32,772 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:36:32,773 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:36:32,774 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:36:32,776 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:36:32,776 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:36:32,779 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 12:36:32,779 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 12:36:32,780 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 12:36:32,781 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 12:36:32,781 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 12:36:32,782 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-20 12:36:32,787 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:36:32,788 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:36:32,789 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:36:32,790 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 12:36:32,804 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:36:32,805 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:36:32,806 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:36:32,806 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:36:32,806 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:36:32,807 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:36:32,807 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:36:32,807 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:36:32,807 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:36:32,807 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:36:32,807 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:36:32,808 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:36:32,808 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:36:32,808 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:36:32,808 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:36:32,808 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:36:32,809 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:36:32,809 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:36:32,809 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:36:32,809 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:36:32,809 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:36:32,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:36:32,810 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:36:32,810 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:36:32,810 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:36:32,810 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:36:32,811 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:32,811 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:36:32,811 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:36:32,811 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 -> NOT_INCREMENTALLY [2020-07-20 12:36:33,107 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:36:33,120 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:36:33,123 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:36:33,125 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:36:33,125 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:36:33,126 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:36:33,200 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75e87deef/ee896897f73a450195574cfe70032697/FLAG33df6d7bc [2020-07-20 12:36:33,786 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:36:33,787 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:36:33,818 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75e87deef/ee896897f73a450195574cfe70032697/FLAG33df6d7bc [2020-07-20 12:36:33,998 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/75e87deef/ee896897f73a450195574cfe70032697 [2020-07-20 12:36:34,005 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:36:34,008 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:36:34,009 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:36:34,009 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:36:34,013 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:36:34,014 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:36:33" (1/1) ... [2020-07-20 12:36:34,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bfe3aad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:34, skipping insertion in model container [2020-07-20 12:36:34,017 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:36:33" (1/1) ... [2020-07-20 12:36:34,024 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:36:34,210 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:36:35,793 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:36:35,808 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:36:37,027 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:36:37,050 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:36:37,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37 WrapperNode [2020-07-20 12:36:37,051 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:36:37,052 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:36:37,052 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:36:37,052 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:36:37,064 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,064 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,100 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,101 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,278 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... [2020-07-20 12:36:37,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:36:37,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:36:37,311 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:36:37,311 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:36:37,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:36:37,391 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:36:37,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:36:37,392 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:36:37,392 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:36:37,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:36:37,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 12:36:37,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 12:36:37,393 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 12:36:37,394 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:36:37,394 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:36:37,394 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 12:36:37,395 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 12:36:37,395 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 12:36:37,395 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 12:36:37,396 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 12:36:37,396 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 12:36:37,396 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 12:36:37,396 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 12:36:37,397 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 12:36:37,397 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:36:37,397 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:36:37,397 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:36:41,577 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:36:41,578 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 12:36:41,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:36:41 BoogieIcfgContainer [2020-07-20 12:36:41,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:36:41,595 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:36:41,595 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:36:41,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:36:41,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:36:33" (1/3) ... [2020-07-20 12:36:41,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@656f79e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:36:41, skipping insertion in model container [2020-07-20 12:36:41,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:36:37" (2/3) ... [2020-07-20 12:36:41,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@656f79e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:36:41, skipping insertion in model container [2020-07-20 12:36:41,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:36:41" (3/3) ... [2020-07-20 12:36:41,603 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-20 12:36:41,613 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:36:41,622 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:36:41,636 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:36:41,666 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:36:41,666 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:36:41,667 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:36:41,667 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:36:41,667 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:36:41,667 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:36:41,667 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:36:41,667 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:36:41,708 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-07-20 12:36:41,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 12:36:41,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:41,758 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:41,758 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:41,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:41,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-07-20 12:36:41,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:41,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513688335] [2020-07-20 12:36:41,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:42,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:42,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 3101 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:36:42,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:43,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:43,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:43,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513688335] [2020-07-20 12:36:43,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:43,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:36:43,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867591732] [2020-07-20 12:36:43,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:36:43,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:43,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:36:43,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:36:43,139 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 4 states. [2020-07-20 12:36:43,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:43,562 INFO L93 Difference]: Finished difference Result 4236 states and 7632 transitions. [2020-07-20 12:36:43,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 12:36:43,564 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 487 [2020-07-20 12:36:43,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:43,600 INFO L225 Difference]: With dead ends: 4236 [2020-07-20 12:36:43,601 INFO L226 Difference]: Without dead ends: 2814 [2020-07-20 12:36:43,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:36:43,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2814 states. [2020-07-20 12:36:43,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812. [2020-07-20 12:36:43,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2812 states. [2020-07-20 12:36:43,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions. [2020-07-20 12:36:43,813 INFO L78 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487 [2020-07-20 12:36:43,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:43,814 INFO L479 AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions. [2020-07-20 12:36:43,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:36:43,815 INFO L276 IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions. [2020-07-20 12:36:43,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 12:36:43,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:43,870 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:44,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:44,084 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:44,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:44,085 INFO L82 PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times [2020-07-20 12:36:44,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:44,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103496916] [2020-07-20 12:36:44,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:44,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:44,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 3104 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:44,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:44,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:44,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:44,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103496916] [2020-07-20 12:36:44,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:44,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:44,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167263479] [2020-07-20 12:36:44,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:44,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:44,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:44,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:44,946 INFO L87 Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 3 states. [2020-07-20 12:36:45,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:45,231 INFO L93 Difference]: Finished difference Result 8158 states and 13422 transitions. [2020-07-20 12:36:45,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:45,232 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-20 12:36:45,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:45,261 INFO L225 Difference]: With dead ends: 8158 [2020-07-20 12:36:45,262 INFO L226 Difference]: Without dead ends: 5560 [2020-07-20 12:36:45,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:45,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5560 states. [2020-07-20 12:36:45,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5560 to 5558. [2020-07-20 12:36:45,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5558 states. [2020-07-20 12:36:45,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5558 states to 5558 states and 9141 transitions. [2020-07-20 12:36:45,473 INFO L78 Accepts]: Start accepts. Automaton has 5558 states and 9141 transitions. Word has length 489 [2020-07-20 12:36:45,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:45,474 INFO L479 AbstractCegarLoop]: Abstraction has 5558 states and 9141 transitions. [2020-07-20 12:36:45,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:45,474 INFO L276 IsEmpty]: Start isEmpty. Operand 5558 states and 9141 transitions. [2020-07-20 12:36:45,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 12:36:45,493 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:45,493 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:45,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:45,709 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:45,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:45,710 INFO L82 PathProgramCache]: Analyzing trace with hash -960654715, now seen corresponding path program 1 times [2020-07-20 12:36:45,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:45,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795098144] [2020-07-20 12:36:45,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:46,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:46,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 3106 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:46,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:46,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:46,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:46,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795098144] [2020-07-20 12:36:46,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:46,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:46,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264703109] [2020-07-20 12:36:46,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:46,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:46,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:46,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:46,412 INFO L87 Difference]: Start difference. First operand 5558 states and 9141 transitions. Second operand 3 states. [2020-07-20 12:36:46,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:46,717 INFO L93 Difference]: Finished difference Result 16577 states and 27255 transitions. [2020-07-20 12:36:46,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:46,718 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-20 12:36:46,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:46,783 INFO L225 Difference]: With dead ends: 16577 [2020-07-20 12:36:46,784 INFO L226 Difference]: Without dead ends: 11071 [2020-07-20 12:36:46,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:46,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11071 states. [2020-07-20 12:36:47,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11071 to 5605. [2020-07-20 12:36:47,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5605 states. [2020-07-20 12:36:47,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5605 states to 5605 states and 9215 transitions. [2020-07-20 12:36:47,215 INFO L78 Accepts]: Start accepts. Automaton has 5605 states and 9215 transitions. Word has length 490 [2020-07-20 12:36:47,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:47,215 INFO L479 AbstractCegarLoop]: Abstraction has 5605 states and 9215 transitions. [2020-07-20 12:36:47,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:47,215 INFO L276 IsEmpty]: Start isEmpty. Operand 5605 states and 9215 transitions. [2020-07-20 12:36:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 12:36:47,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:47,236 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:47,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:47,450 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:47,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:47,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1982115813, now seen corresponding path program 1 times [2020-07-20 12:36:47,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:47,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098931386] [2020-07-20 12:36:47,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:47,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:47,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 3107 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:47,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:48,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:48,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:48,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098931386] [2020-07-20 12:36:48,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:48,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:48,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180562232] [2020-07-20 12:36:48,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:48,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:48,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:48,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:48,235 INFO L87 Difference]: Start difference. First operand 5605 states and 9215 transitions. Second operand 3 states. [2020-07-20 12:36:48,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:48,720 INFO L93 Difference]: Finished difference Result 16140 states and 26444 transitions. [2020-07-20 12:36:48,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:48,720 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 491 [2020-07-20 12:36:48,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:48,765 INFO L225 Difference]: With dead ends: 16140 [2020-07-20 12:36:48,766 INFO L226 Difference]: Without dead ends: 10934 [2020-07-20 12:36:48,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:48,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10934 states. [2020-07-20 12:36:49,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10934 to 10932. [2020-07-20 12:36:49,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10932 states. [2020-07-20 12:36:49,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10932 states to 10932 states and 17885 transitions. [2020-07-20 12:36:49,199 INFO L78 Accepts]: Start accepts. Automaton has 10932 states and 17885 transitions. Word has length 491 [2020-07-20 12:36:49,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:49,199 INFO L479 AbstractCegarLoop]: Abstraction has 10932 states and 17885 transitions. [2020-07-20 12:36:49,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:49,200 INFO L276 IsEmpty]: Start isEmpty. Operand 10932 states and 17885 transitions. [2020-07-20 12:36:49,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 12:36:49,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:49,240 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:49,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:49,454 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:49,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:49,455 INFO L82 PathProgramCache]: Analyzing trace with hash -2002117056, now seen corresponding path program 1 times [2020-07-20 12:36:49,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:49,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220375994] [2020-07-20 12:36:49,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:49,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:49,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 3109 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:49,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:50,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:50,658 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:50,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220375994] [2020-07-20 12:36:50,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:50,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:50,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295048225] [2020-07-20 12:36:50,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:50,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:50,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:50,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:50,662 INFO L87 Difference]: Start difference. First operand 10932 states and 17885 transitions. Second operand 3 states. [2020-07-20 12:36:51,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:51,201 INFO L93 Difference]: Finished difference Result 32540 states and 53210 transitions. [2020-07-20 12:36:51,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:51,201 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 491 [2020-07-20 12:36:51,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:51,252 INFO L225 Difference]: With dead ends: 32540 [2020-07-20 12:36:51,253 INFO L226 Difference]: Without dead ends: 21752 [2020-07-20 12:36:51,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:51,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21752 states. [2020-07-20 12:36:51,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21752 to 11030. [2020-07-20 12:36:51,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11030 states. [2020-07-20 12:36:51,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11030 states to 11030 states and 18036 transitions. [2020-07-20 12:36:51,801 INFO L78 Accepts]: Start accepts. Automaton has 11030 states and 18036 transitions. Word has length 491 [2020-07-20 12:36:51,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:51,802 INFO L479 AbstractCegarLoop]: Abstraction has 11030 states and 18036 transitions. [2020-07-20 12:36:51,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:51,806 INFO L276 IsEmpty]: Start isEmpty. Operand 11030 states and 18036 transitions. [2020-07-20 12:36:51,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-20 12:36:51,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:51,831 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:52,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:52,046 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:52,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:52,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1954950484, now seen corresponding path program 1 times [2020-07-20 12:36:52,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:52,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1776405687] [2020-07-20 12:36:52,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:52,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:52,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 3110 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:52,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:52,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:52,683 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:52,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1776405687] [2020-07-20 12:36:52,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:52,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:52,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359096641] [2020-07-20 12:36:52,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:52,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:52,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:52,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:52,686 INFO L87 Difference]: Start difference. First operand 11030 states and 18036 transitions. Second operand 3 states. [2020-07-20 12:36:53,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:53,241 INFO L93 Difference]: Finished difference Result 32675 states and 53391 transitions. [2020-07-20 12:36:53,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:53,242 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 492 [2020-07-20 12:36:53,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:53,296 INFO L225 Difference]: With dead ends: 32675 [2020-07-20 12:36:53,297 INFO L226 Difference]: Without dead ends: 21869 [2020-07-20 12:36:53,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:53,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21869 states. [2020-07-20 12:36:54,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21869 to 11147. [2020-07-20 12:36:54,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11147 states. [2020-07-20 12:36:54,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11147 states to 11147 states and 18182 transitions. [2020-07-20 12:36:54,058 INFO L78 Accepts]: Start accepts. Automaton has 11147 states and 18182 transitions. Word has length 492 [2020-07-20 12:36:54,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:54,058 INFO L479 AbstractCegarLoop]: Abstraction has 11147 states and 18182 transitions. [2020-07-20 12:36:54,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:54,058 INFO L276 IsEmpty]: Start isEmpty. Operand 11147 states and 18182 transitions. [2020-07-20 12:36:54,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 12:36:54,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:54,083 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:54,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:54,298 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:54,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:54,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1783853194, now seen corresponding path program 1 times [2020-07-20 12:36:54,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:54,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290446841] [2020-07-20 12:36:54,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:54,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:54,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 3110 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:36:54,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:55,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:55,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:55,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290446841] [2020-07-20 12:36:55,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:55,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:36:55,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212959080] [2020-07-20 12:36:55,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:36:55,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:55,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:36:55,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:55,011 INFO L87 Difference]: Start difference. First operand 11147 states and 18182 transitions. Second operand 3 states. [2020-07-20 12:36:55,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:55,710 INFO L93 Difference]: Finished difference Result 31726 states and 51629 transitions. [2020-07-20 12:36:55,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:36:55,710 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 493 [2020-07-20 12:36:55,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:55,762 INFO L225 Difference]: With dead ends: 31726 [2020-07-20 12:36:55,762 INFO L226 Difference]: Without dead ends: 21548 [2020-07-20 12:36:55,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 491 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:36:55,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21548 states. [2020-07-20 12:36:56,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21548 to 21546. [2020-07-20 12:36:56,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21546 states. [2020-07-20 12:36:56,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21546 states to 21546 states and 34987 transitions. [2020-07-20 12:36:56,604 INFO L78 Accepts]: Start accepts. Automaton has 21546 states and 34987 transitions. Word has length 493 [2020-07-20 12:36:56,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:36:56,604 INFO L479 AbstractCegarLoop]: Abstraction has 21546 states and 34987 transitions. [2020-07-20 12:36:56,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:36:56,605 INFO L276 IsEmpty]: Start isEmpty. Operand 21546 states and 34987 transitions. [2020-07-20 12:36:56,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 12:36:56,648 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:36:56,648 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:36:56,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:56,862 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:36:56,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:36:56,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1122991245, now seen corresponding path program 1 times [2020-07-20 12:36:56,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:36:56,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865603348] [2020-07-20 12:36:56,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:36:57,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:36:57,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 3111 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:36:57,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:36:57,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:36:57,698 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:36:57,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865603348] [2020-07-20 12:36:57,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:36:57,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:36:57,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094244214] [2020-07-20 12:36:57,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:36:57,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:36:57,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:36:57,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:36:57,701 INFO L87 Difference]: Start difference. First operand 21546 states and 34987 transitions. Second operand 4 states. [2020-07-20 12:36:58,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:36:58,561 INFO L93 Difference]: Finished difference Result 59915 states and 96831 transitions. [2020-07-20 12:36:58,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:36:58,561 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 493 [2020-07-20 12:36:58,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:36:59,392 INFO L225 Difference]: With dead ends: 59915 [2020-07-20 12:36:59,392 INFO L226 Difference]: Without dead ends: 40649 [2020-07-20 12:36:59,429 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:36:59,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40649 states. [2020-07-20 12:37:00,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40649 to 22839. [2020-07-20 12:37:00,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22839 states. [2020-07-20 12:37:00,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22839 states to 22839 states and 37266 transitions. [2020-07-20 12:37:00,198 INFO L78 Accepts]: Start accepts. Automaton has 22839 states and 37266 transitions. Word has length 493 [2020-07-20 12:37:00,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:00,198 INFO L479 AbstractCegarLoop]: Abstraction has 22839 states and 37266 transitions. [2020-07-20 12:37:00,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:37:00,198 INFO L276 IsEmpty]: Start isEmpty. Operand 22839 states and 37266 transitions. [2020-07-20 12:37:00,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 12:37:00,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:00,221 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:00,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:00,422 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:00,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:00,423 INFO L82 PathProgramCache]: Analyzing trace with hash -979225654, now seen corresponding path program 1 times [2020-07-20 12:37:00,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:00,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808794287] [2020-07-20 12:37:00,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:00,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:00,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 3124 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:37:00,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:01,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:01,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:01,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808794287] [2020-07-20 12:37:01,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:01,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 12:37:01,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276933234] [2020-07-20 12:37:01,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:37:01,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:01,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:37:01,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:37:01,495 INFO L87 Difference]: Start difference. First operand 22839 states and 37266 transitions. Second operand 8 states. [2020-07-20 12:37:05,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:05,241 INFO L93 Difference]: Finished difference Result 51586 states and 83135 transitions. [2020-07-20 12:37:05,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:37:05,243 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 493 [2020-07-20 12:37:05,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:05,289 INFO L225 Difference]: With dead ends: 51586 [2020-07-20 12:37:05,290 INFO L226 Difference]: Without dead ends: 38888 [2020-07-20 12:37:05,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 486 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 12:37:05,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38888 states. [2020-07-20 12:37:06,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38888 to 28435. [2020-07-20 12:37:06,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28435 states. [2020-07-20 12:37:06,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28435 states to 28435 states and 45718 transitions. [2020-07-20 12:37:06,314 INFO L78 Accepts]: Start accepts. Automaton has 28435 states and 45718 transitions. Word has length 493 [2020-07-20 12:37:06,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:06,315 INFO L479 AbstractCegarLoop]: Abstraction has 28435 states and 45718 transitions. [2020-07-20 12:37:06,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:37:06,315 INFO L276 IsEmpty]: Start isEmpty. Operand 28435 states and 45718 transitions. [2020-07-20 12:37:06,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-20 12:37:06,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:06,337 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:06,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:06,552 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:06,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:06,553 INFO L82 PathProgramCache]: Analyzing trace with hash 195387179, now seen corresponding path program 1 times [2020-07-20 12:37:06,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:06,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439496493] [2020-07-20 12:37:06,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:07,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:07,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 3116 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:07,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:07,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:07,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:07,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439496493] [2020-07-20 12:37:07,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:07,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:07,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789187318] [2020-07-20 12:37:07,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:07,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:07,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:07,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:07,510 INFO L87 Difference]: Start difference. First operand 28435 states and 45718 transitions. Second operand 3 states. [2020-07-20 12:37:09,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:09,124 INFO L93 Difference]: Finished difference Result 52903 states and 83944 transitions. [2020-07-20 12:37:09,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:37:09,124 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 493 [2020-07-20 12:37:09,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:09,169 INFO L225 Difference]: With dead ends: 52903 [2020-07-20 12:37:09,169 INFO L226 Difference]: Without dead ends: 34305 [2020-07-20 12:37:09,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 491 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:09,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34305 states. [2020-07-20 12:37:11,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34305 to 30143. [2020-07-20 12:37:11,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30143 states. [2020-07-20 12:37:11,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30143 states to 30143 states and 48538 transitions. [2020-07-20 12:37:11,182 INFO L78 Accepts]: Start accepts. Automaton has 30143 states and 48538 transitions. Word has length 493 [2020-07-20 12:37:11,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:11,183 INFO L479 AbstractCegarLoop]: Abstraction has 30143 states and 48538 transitions. [2020-07-20 12:37:11,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:37:11,183 INFO L276 IsEmpty]: Start isEmpty. Operand 30143 states and 48538 transitions. [2020-07-20 12:37:11,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 12:37:11,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:11,209 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:11,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:11,425 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:11,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:11,426 INFO L82 PathProgramCache]: Analyzing trace with hash 436421350, now seen corresponding path program 1 times [2020-07-20 12:37:11,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:11,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1130282395] [2020-07-20 12:37:11,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:11,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:11,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 3131 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:37:11,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:12,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:12,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:12,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1130282395] [2020-07-20 12:37:12,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:12,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 12:37:12,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647532443] [2020-07-20 12:37:12,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:37:12,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:12,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:37:12,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:37:12,213 INFO L87 Difference]: Start difference. First operand 30143 states and 48538 transitions. Second operand 8 states. [2020-07-20 12:37:13,049 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 12:37:16,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:16,505 INFO L93 Difference]: Finished difference Result 64861 states and 104173 transitions. [2020-07-20 12:37:16,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:37:16,506 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 495 [2020-07-20 12:37:16,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:16,563 INFO L225 Difference]: With dead ends: 64861 [2020-07-20 12:37:16,563 INFO L226 Difference]: Without dead ends: 55723 [2020-07-20 12:37:16,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 12:37:16,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55723 states. [2020-07-20 12:37:17,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55723 to 35991. [2020-07-20 12:37:17,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35991 states. [2020-07-20 12:37:17,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35991 states to 35991 states and 57758 transitions. [2020-07-20 12:37:17,985 INFO L78 Accepts]: Start accepts. Automaton has 35991 states and 57758 transitions. Word has length 495 [2020-07-20 12:37:17,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:17,986 INFO L479 AbstractCegarLoop]: Abstraction has 35991 states and 57758 transitions. [2020-07-20 12:37:17,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:37:17,986 INFO L276 IsEmpty]: Start isEmpty. Operand 35991 states and 57758 transitions. [2020-07-20 12:37:18,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-20 12:37:18,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:18,012 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:18,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:18,224 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:18,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:18,225 INFO L82 PathProgramCache]: Analyzing trace with hash 601865131, now seen corresponding path program 1 times [2020-07-20 12:37:18,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:18,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376933685] [2020-07-20 12:37:18,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:18,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:18,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 3119 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:18,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:19,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:19,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:19,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376933685] [2020-07-20 12:37:19,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:19,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:19,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804066973] [2020-07-20 12:37:19,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:19,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:19,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:19,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:19,935 INFO L87 Difference]: Start difference. First operand 35991 states and 57758 transitions. Second operand 3 states. [2020-07-20 12:37:21,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:21,784 INFO L93 Difference]: Finished difference Result 72539 states and 115552 transitions. [2020-07-20 12:37:21,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:37:21,785 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 495 [2020-07-20 12:37:21,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:21,838 INFO L225 Difference]: With dead ends: 72539 [2020-07-20 12:37:21,839 INFO L226 Difference]: Without dead ends: 47153 [2020-07-20 12:37:21,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:21,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47153 states. [2020-07-20 12:37:23,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47153 to 42487. [2020-07-20 12:37:23,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42487 states. [2020-07-20 12:37:23,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42487 states to 42487 states and 68282 transitions. [2020-07-20 12:37:23,777 INFO L78 Accepts]: Start accepts. Automaton has 42487 states and 68282 transitions. Word has length 495 [2020-07-20 12:37:23,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:23,778 INFO L479 AbstractCegarLoop]: Abstraction has 42487 states and 68282 transitions. [2020-07-20 12:37:23,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:37:23,778 INFO L276 IsEmpty]: Start isEmpty. Operand 42487 states and 68282 transitions. [2020-07-20 12:37:23,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 12:37:23,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:23,806 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:24,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:24,007 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:24,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:24,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1416716575, now seen corresponding path program 1 times [2020-07-20 12:37:24,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:24,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604715856] [2020-07-20 12:37:24,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:24,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:24,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 3118 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:24,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:24,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:24,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:24,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604715856] [2020-07-20 12:37:24,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:24,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:24,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100507384] [2020-07-20 12:37:24,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:24,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:24,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:24,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:24,644 INFO L87 Difference]: Start difference. First operand 42487 states and 68282 transitions. Second operand 3 states. [2020-07-20 12:37:28,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:28,283 INFO L93 Difference]: Finished difference Result 120430 states and 192343 transitions. [2020-07-20 12:37:28,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:37:28,284 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-20 12:37:28,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:28,363 INFO L225 Difference]: With dead ends: 120430 [2020-07-20 12:37:28,363 INFO L226 Difference]: Without dead ends: 81496 [2020-07-20 12:37:28,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:28,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81496 states. [2020-07-20 12:37:30,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81496 to 42934. [2020-07-20 12:37:30,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42934 states. [2020-07-20 12:37:30,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42934 states to 42934 states and 68957 transitions. [2020-07-20 12:37:30,422 INFO L78 Accepts]: Start accepts. Automaton has 42934 states and 68957 transitions. Word has length 496 [2020-07-20 12:37:30,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:30,422 INFO L479 AbstractCegarLoop]: Abstraction has 42934 states and 68957 transitions. [2020-07-20 12:37:30,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:37:30,422 INFO L276 IsEmpty]: Start isEmpty. Operand 42934 states and 68957 transitions. [2020-07-20 12:37:30,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 12:37:30,447 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:30,447 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:31,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:31,886 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:31,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:31,887 INFO L82 PathProgramCache]: Analyzing trace with hash 43078897, now seen corresponding path program 1 times [2020-07-20 12:37:31,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:31,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931649544] [2020-07-20 12:37:31,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:32,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:32,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 3122 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:37:32,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:32,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:32,621 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:32,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931649544] [2020-07-20 12:37:32,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:32,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:37:32,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685515111] [2020-07-20 12:37:32,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:37:32,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:32,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:37:32,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:37:32,623 INFO L87 Difference]: Start difference. First operand 42934 states and 68957 transitions. Second operand 4 states. [2020-07-20 12:37:34,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:34,916 INFO L93 Difference]: Finished difference Result 89050 states and 143132 transitions. [2020-07-20 12:37:34,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:37:34,916 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-20 12:37:34,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:34,963 INFO L225 Difference]: With dead ends: 89050 [2020-07-20 12:37:34,964 INFO L226 Difference]: Without dead ends: 47603 [2020-07-20 12:37:34,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:37:35,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47603 states. [2020-07-20 12:37:36,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47603 to 42917. [2020-07-20 12:37:36,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42917 states. [2020-07-20 12:37:36,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42917 states to 42917 states and 68870 transitions. [2020-07-20 12:37:36,942 INFO L78 Accepts]: Start accepts. Automaton has 42917 states and 68870 transitions. Word has length 496 [2020-07-20 12:37:36,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:36,943 INFO L479 AbstractCegarLoop]: Abstraction has 42917 states and 68870 transitions. [2020-07-20 12:37:36,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:37:36,943 INFO L276 IsEmpty]: Start isEmpty. Operand 42917 states and 68870 transitions. [2020-07-20 12:37:36,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-20 12:37:36,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:36,965 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:37,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:37,167 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:37,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:37,167 INFO L82 PathProgramCache]: Analyzing trace with hash -856103602, now seen corresponding path program 1 times [2020-07-20 12:37:37,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:37,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390953940] [2020-07-20 12:37:37,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:37,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:37,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 3130 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 12:37:37,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:38,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:38,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:38,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390953940] [2020-07-20 12:37:38,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:38,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 12:37:38,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523342] [2020-07-20 12:37:38,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 12:37:38,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:38,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 12:37:38,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 12:37:38,098 INFO L87 Difference]: Start difference. First operand 42917 states and 68870 transitions. Second operand 8 states. [2020-07-20 12:37:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:44,679 INFO L93 Difference]: Finished difference Result 104019 states and 166990 transitions. [2020-07-20 12:37:44,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 12:37:44,680 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 497 [2020-07-20 12:37:44,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:44,780 INFO L225 Difference]: With dead ends: 104019 [2020-07-20 12:37:44,780 INFO L226 Difference]: Without dead ends: 88610 [2020-07-20 12:37:44,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 12:37:44,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88610 states. [2020-07-20 12:37:49,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88610 to 51372. [2020-07-20 12:37:49,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51372 states. [2020-07-20 12:37:49,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51372 states to 51372 states and 82269 transitions. [2020-07-20 12:37:49,615 INFO L78 Accepts]: Start accepts. Automaton has 51372 states and 82269 transitions. Word has length 497 [2020-07-20 12:37:49,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:49,616 INFO L479 AbstractCegarLoop]: Abstraction has 51372 states and 82269 transitions. [2020-07-20 12:37:49,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 12:37:49,616 INFO L276 IsEmpty]: Start isEmpty. Operand 51372 states and 82269 transitions. [2020-07-20 12:37:49,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-20 12:37:49,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:49,654 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:49,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:49,868 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:49,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:49,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1219285027, now seen corresponding path program 1 times [2020-07-20 12:37:49,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:49,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458051250] [2020-07-20 12:37:49,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:50,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:50,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 3122 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:37:50,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:50,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:50,481 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:50,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458051250] [2020-07-20 12:37:50,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:50,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:37:50,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016569875] [2020-07-20 12:37:50,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:37:50,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:50,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:37:50,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:50,483 INFO L87 Difference]: Start difference. First operand 51372 states and 82269 transitions. Second operand 3 states. [2020-07-20 12:37:54,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:37:54,499 INFO L93 Difference]: Finished difference Result 112107 states and 179098 transitions. [2020-07-20 12:37:54,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:37:54,500 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 497 [2020-07-20 12:37:54,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:37:54,577 INFO L225 Difference]: With dead ends: 112107 [2020-07-20 12:37:54,578 INFO L226 Difference]: Without dead ends: 72162 [2020-07-20 12:37:54,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:37:54,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72162 states. [2020-07-20 12:37:58,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72162 to 66448. [2020-07-20 12:37:58,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66448 states. [2020-07-20 12:37:58,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66448 states to 66448 states and 106485 transitions. [2020-07-20 12:37:58,937 INFO L78 Accepts]: Start accepts. Automaton has 66448 states and 106485 transitions. Word has length 497 [2020-07-20 12:37:58,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:37:58,937 INFO L479 AbstractCegarLoop]: Abstraction has 66448 states and 106485 transitions. [2020-07-20 12:37:58,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:37:58,937 INFO L276 IsEmpty]: Start isEmpty. Operand 66448 states and 106485 transitions. [2020-07-20 12:37:58,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 12:37:58,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:37:58,961 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:37:59,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:37:59,162 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:37:59,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:37:59,163 INFO L82 PathProgramCache]: Analyzing trace with hash 2085113593, now seen corresponding path program 1 times [2020-07-20 12:37:59,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:37:59,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487695248] [2020-07-20 12:37:59,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 12:37:59,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:37:59,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 3125 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 12:37:59,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:37:59,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:37:59,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:37:59,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487695248] [2020-07-20 12:37:59,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:37:59,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:37:59,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192100106] [2020-07-20 12:37:59,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:37:59,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:37:59,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:37:59,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:37:59,893 INFO L87 Difference]: Start difference. First operand 66448 states and 106485 transitions. Second operand 4 states. [2020-07-20 12:38:08,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:38:08,956 INFO L93 Difference]: Finished difference Result 196743 states and 315454 transitions. [2020-07-20 12:38:08,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 12:38:08,957 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 498 [2020-07-20 12:38:08,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:38:09,118 INFO L225 Difference]: With dead ends: 196743 [2020-07-20 12:38:09,119 INFO L226 Difference]: Without dead ends: 130990 [2020-07-20 12:38:09,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 12:38:09,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130990 states. [2020-07-20 12:38:19,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130990 to 130988. [2020-07-20 12:38:19,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130988 states. [2020-07-20 12:38:19,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130988 states to 130988 states and 209504 transitions. [2020-07-20 12:38:19,862 INFO L78 Accepts]: Start accepts. Automaton has 130988 states and 209504 transitions. Word has length 498 [2020-07-20 12:38:19,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:38:19,862 INFO L479 AbstractCegarLoop]: Abstraction has 130988 states and 209504 transitions. [2020-07-20 12:38:19,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 12:38:19,863 INFO L276 IsEmpty]: Start isEmpty. Operand 130988 states and 209504 transitions. [2020-07-20 12:38:19,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 12:38:19,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:38:19,908 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:38:20,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:38:20,109 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:38:20,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:38:20,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1843626231, now seen corresponding path program 1 times [2020-07-20 12:38:20,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:38:20,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84970216] [2020-07-20 12:38:20,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:38:20,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:38:20,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 3128 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:38:20,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:38:20,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:38:20,797 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:38:20,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84970216] [2020-07-20 12:38:20,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:38:20,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:38:20,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913499537] [2020-07-20 12:38:20,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:38:20,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:38:20,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:38:20,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:38:20,799 INFO L87 Difference]: Start difference. First operand 130988 states and 209504 transitions. Second operand 3 states. [2020-07-20 12:38:39,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:38:39,273 INFO L93 Difference]: Finished difference Result 387084 states and 619257 transitions. [2020-07-20 12:38:39,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:38:39,274 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 12:38:39,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:38:39,602 INFO L225 Difference]: With dead ends: 387084 [2020-07-20 12:38:39,602 INFO L226 Difference]: Without dead ends: 257692 [2020-07-20 12:38:39,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:38:39,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257692 states. [2020-07-20 12:39:00,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257692 to 257690. [2020-07-20 12:39:00,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257690 states. [2020-07-20 12:39:00,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257690 states to 257690 states and 411053 transitions. [2020-07-20 12:39:00,910 INFO L78 Accepts]: Start accepts. Automaton has 257690 states and 411053 transitions. Word has length 500 [2020-07-20 12:39:00,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:39:00,910 INFO L479 AbstractCegarLoop]: Abstraction has 257690 states and 411053 transitions. [2020-07-20 12:39:00,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:39:00,910 INFO L276 IsEmpty]: Start isEmpty. Operand 257690 states and 411053 transitions. [2020-07-20 12:39:01,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 12:39:01,016 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:39:01,016 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:39:01,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:39:01,217 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:39:01,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:39:01,218 INFO L82 PathProgramCache]: Analyzing trace with hash 319540186, now seen corresponding path program 1 times [2020-07-20 12:39:01,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:39:01,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297474365] [2020-07-20 12:39:01,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:39:01,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:39:01,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 3130 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:39:01,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:39:01,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:39:01,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:39:01,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297474365] [2020-07-20 12:39:01,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:39:01,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:39:01,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715448492] [2020-07-20 12:39:01,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:39:01,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:39:01,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:39:01,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:39:01,858 INFO L87 Difference]: Start difference. First operand 257690 states and 411053 transitions. Second operand 3 states. [2020-07-20 12:39:40,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:39:40,417 INFO L93 Difference]: Finished difference Result 770681 states and 1229241 transitions. [2020-07-20 12:39:40,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:39:40,418 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-20 12:39:40,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:39:41,071 INFO L225 Difference]: With dead ends: 770681 [2020-07-20 12:39:41,071 INFO L226 Difference]: Without dead ends: 513863 [2020-07-20 12:39:41,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:39:41,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513863 states. [2020-07-20 12:40:07,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513863 to 257930. [2020-07-20 12:40:07,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257930 states. [2020-07-20 12:40:07,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257930 states to 257930 states and 411415 transitions. [2020-07-20 12:40:07,641 INFO L78 Accepts]: Start accepts. Automaton has 257930 states and 411415 transitions. Word has length 501 [2020-07-20 12:40:07,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:40:07,642 INFO L479 AbstractCegarLoop]: Abstraction has 257930 states and 411415 transitions. [2020-07-20 12:40:07,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:40:07,642 INFO L276 IsEmpty]: Start isEmpty. Operand 257930 states and 411415 transitions. [2020-07-20 12:40:07,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 12:40:07,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:40:07,742 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:40:07,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:40:07,946 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:40:07,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:40:07,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1909551004, now seen corresponding path program 1 times [2020-07-20 12:40:07,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:40:07,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995403709] [2020-07-20 12:40:07,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:40:08,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:40:08,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 3131 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:40:08,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:40:08,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:40:08,724 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:40:08,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995403709] [2020-07-20 12:40:08,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:40:08,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:40:08,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657343074] [2020-07-20 12:40:08,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:40:08,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:40:08,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:40:08,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:40:08,726 INFO L87 Difference]: Start difference. First operand 257930 states and 411415 transitions. Second operand 3 states. [2020-07-20 12:40:49,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:40:49,859 INFO L93 Difference]: Finished difference Result 765439 states and 1221019 transitions. [2020-07-20 12:40:49,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:40:49,860 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 12:40:49,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:40:50,521 INFO L225 Difference]: With dead ends: 765439 [2020-07-20 12:40:50,522 INFO L226 Difference]: Without dead ends: 509434 [2020-07-20 12:40:50,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:40:51,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509434 states. [2020-07-20 12:41:41,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509434 to 509432. [2020-07-20 12:41:41,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 509432 states. [2020-07-20 12:41:42,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509432 states to 509432 states and 810519 transitions. [2020-07-20 12:41:42,457 INFO L78 Accepts]: Start accepts. Automaton has 509432 states and 810519 transitions. Word has length 502 [2020-07-20 12:41:42,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:41:42,458 INFO L479 AbstractCegarLoop]: Abstraction has 509432 states and 810519 transitions. [2020-07-20 12:41:42,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:41:42,458 INFO L276 IsEmpty]: Start isEmpty. Operand 509432 states and 810519 transitions. [2020-07-20 12:41:42,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 12:41:42,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:41:42,663 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:41:42,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:41:42,864 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:41:42,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:41:42,865 INFO L82 PathProgramCache]: Analyzing trace with hash 40135337, now seen corresponding path program 1 times [2020-07-20 12:41:42,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:41:42,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515793526] [2020-07-20 12:41:42,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:41:43,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:41:43,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:41:43,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:41:44,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:41:44,363 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:41:44,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515793526] [2020-07-20 12:41:44,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:41:44,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:41:44,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559854887] [2020-07-20 12:41:44,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:41:44,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:41:44,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:41:44,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:41:44,364 INFO L87 Difference]: Start difference. First operand 509432 states and 810519 transitions. Second operand 3 states. [2020-07-20 12:43:15,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:43:15,790 INFO L93 Difference]: Finished difference Result 1525825 states and 2427566 transitions. [2020-07-20 12:43:15,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:43:15,790 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 12:43:15,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:43:17,234 INFO L225 Difference]: With dead ends: 1525825 [2020-07-20 12:43:17,235 INFO L226 Difference]: Without dead ends: 1017483 [2020-07-20 12:43:17,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:43:18,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1017483 states. [2020-07-20 12:44:14,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1017483 to 510239. [2020-07-20 12:44:14,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 510239 states. [2020-07-20 12:44:15,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510239 states to 510239 states and 811722 transitions. [2020-07-20 12:44:15,356 INFO L78 Accepts]: Start accepts. Automaton has 510239 states and 811722 transitions. Word has length 502 [2020-07-20 12:44:15,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:44:15,356 INFO L479 AbstractCegarLoop]: Abstraction has 510239 states and 811722 transitions. [2020-07-20 12:44:15,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:44:15,356 INFO L276 IsEmpty]: Start isEmpty. Operand 510239 states and 811722 transitions. [2020-07-20 12:44:15,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2020-07-20 12:44:15,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:44:15,579 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:44:15,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:44:15,788 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:44:15,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:44:15,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1137629291, now seen corresponding path program 1 times [2020-07-20 12:44:15,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:44:15,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826609413] [2020-07-20 12:44:15,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:44:17,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:44:17,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 3134 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 12:44:17,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:44:17,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:44:17,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:44:17,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826609413] [2020-07-20 12:44:17,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:44:17,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:44:17,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653799374] [2020-07-20 12:44:17,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:44:17,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:44:17,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:44:17,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:44:17,396 INFO L87 Difference]: Start difference. First operand 510239 states and 811722 transitions. Second operand 3 states. [2020-07-20 12:45:54,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:45:54,230 INFO L93 Difference]: Finished difference Result 1526259 states and 2427918 transitions. [2020-07-20 12:45:54,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:45:54,231 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 503 [2020-07-20 12:45:54,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:45:55,702 INFO L225 Difference]: With dead ends: 1526259 [2020-07-20 12:45:55,703 INFO L226 Difference]: Without dead ends: 1017989 [2020-07-20 12:45:56,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:45:56,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1017989 states. [2020-07-20 12:46:54,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1017989 to 511427. [2020-07-20 12:46:54,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 511427 states. [2020-07-20 12:46:55,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511427 states to 511427 states and 813270 transitions. [2020-07-20 12:46:55,364 INFO L78 Accepts]: Start accepts. Automaton has 511427 states and 813270 transitions. Word has length 503 [2020-07-20 12:46:55,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:46:55,364 INFO L479 AbstractCegarLoop]: Abstraction has 511427 states and 813270 transitions. [2020-07-20 12:46:55,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:46:55,364 INFO L276 IsEmpty]: Start isEmpty. Operand 511427 states and 813270 transitions. [2020-07-20 12:46:56,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 12:46:56,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:46:56,409 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:46:56,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:46:56,610 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:46:56,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:46:56,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1244038788, now seen corresponding path program 1 times [2020-07-20 12:46:56,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:46:56,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597884963] [2020-07-20 12:46:56,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:46:57,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:46:57,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 3135 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 12:46:57,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:46:57,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:46:57,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:46:57,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597884963] [2020-07-20 12:46:57,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:46:57,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 12:46:57,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618446232] [2020-07-20 12:46:57,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 12:46:57,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:46:57,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 12:46:57,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 12:46:57,212 INFO L87 Difference]: Start difference. First operand 511427 states and 813270 transitions. Second operand 4 states.