/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 15:07:44,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 15:07:44,646 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 15:07:44,664 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 15:07:44,664 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 15:07:44,666 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 15:07:44,668 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 15:07:44,677 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 15:07:44,682 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 15:07:44,685 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 15:07:44,686 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 15:07:44,687 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 15:07:44,687 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 15:07:44,689 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 15:07:44,691 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 15:07:44,692 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 15:07:44,694 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 15:07:44,695 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 15:07:44,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 15:07:44,700 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 15:07:44,705 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 15:07:44,708 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 15:07:44,709 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 15:07:44,710 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 15:07:44,712 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 15:07:44,720 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 15:07:44,721 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 15:07:44,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 15:07:44,723 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 15:07:44,760 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 15:07:44,761 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 15:07:44,762 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 15:07:44,762 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 15:07:44,762 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 15:07:44,762 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 15:07:44,763 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 15:07:44,764 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 15:07:44,764 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 15:07:44,764 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 15:07:44,764 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 15:07:44,764 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 15:07:44,765 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 15:07:44,765 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 15:07:44,765 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 15:07:44,765 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 15:07:44,765 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 15:07:44,766 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 15:07:44,766 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 15:07:44,766 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 15:07:44,766 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 15:07:44,766 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:44,767 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 15:07:44,767 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 15:07:44,767 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 15:07:45,052 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 15:07:45,072 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 15:07:45,075 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 15:07:45,077 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 15:07:45,077 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 15:07:45,078 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:07:45,138 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42f4fc0b0/98cdf76fc8cc44648acefcae22e04bf4/FLAG882f5b5bd [2020-07-20 15:07:45,734 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 15:07:45,735 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:07:45,764 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42f4fc0b0/98cdf76fc8cc44648acefcae22e04bf4/FLAG882f5b5bd [2020-07-20 15:07:45,975 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42f4fc0b0/98cdf76fc8cc44648acefcae22e04bf4 [2020-07-20 15:07:45,985 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 15:07:45,988 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 15:07:45,989 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 15:07:45,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 15:07:45,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 15:07:45,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:07:45" (1/1) ... [2020-07-20 15:07:45,997 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d369409 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:45, skipping insertion in model container [2020-07-20 15:07:45,997 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:07:45" (1/1) ... [2020-07-20 15:07:46,004 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 15:07:46,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 15:07:47,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:07:47,122 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 15:07:47,593 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 15:07:47,620 INFO L208 MainTranslator]: Completed translation [2020-07-20 15:07:47,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47 WrapperNode [2020-07-20 15:07:47,621 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 15:07:47,622 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 15:07:47,622 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 15:07:47,622 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 15:07:47,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,664 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,664 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,773 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (1/1) ... [2020-07-20 15:07:47,792 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 15:07:47,793 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 15:07:47,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 15:07:47,795 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 15:07:47,797 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (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 15:07:47,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 15:07:47,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 15:07:47,870 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 15:07:47,871 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 15:07:47,871 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 15:07:47,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 15:07:47,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 15:07:47,872 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 15:07:47,872 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 15:07:47,872 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 15:07:47,873 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 15:07:47,873 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 15:07:47,873 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 15:07:47,874 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 15:07:47,874 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 15:07:47,875 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 15:07:47,875 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 15:07:47,875 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 15:07:47,875 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 15:07:47,876 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 15:07:47,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 15:07:47,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 15:07:50,445 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 15:07:50,445 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 15:07:50,454 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:07:50 BoogieIcfgContainer [2020-07-20 15:07:50,454 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 15:07:50,456 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 15:07:50,456 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 15:07:50,459 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 15:07:50,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:07:45" (1/3) ... [2020-07-20 15:07:50,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65ae9d34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:07:50, skipping insertion in model container [2020-07-20 15:07:50,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:07:47" (2/3) ... [2020-07-20 15:07:50,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65ae9d34 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:07:50, skipping insertion in model container [2020-07-20 15:07:50,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:07:50" (3/3) ... [2020-07-20 15:07:50,463 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.4.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 15:07:50,474 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 15:07:50,483 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 15:07:50,496 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 15:07:50,523 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 15:07:50,523 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 15:07:50,523 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 15:07:50,524 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 15:07:50,524 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 15:07:50,524 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 15:07:50,524 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 15:07:50,524 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 15:07:50,566 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states. [2020-07-20 15:07:50,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-20 15:07:50,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:50,610 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] [2020-07-20 15:07:50,610 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:50,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:50,617 INFO L82 PathProgramCache]: Analyzing trace with hash -368782429, now seen corresponding path program 1 times [2020-07-20 15:07:50,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:50,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519295103] [2020-07-20 15:07:50,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:51,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:07:51,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:51,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 1102 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:07:51,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:51,453 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 15:07:51,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:51,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519295103] [2020-07-20 15:07:51,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:51,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:07:51,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635100033] [2020-07-20 15:07:51,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:07:51,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:51,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:07:51,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:07:51,478 INFO L87 Difference]: Start difference. First operand 789 states. Second operand 4 states. [2020-07-20 15:07:51,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:51,875 INFO L93 Difference]: Finished difference Result 2315 states and 4118 transitions. [2020-07-20 15:07:51,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 15:07:51,877 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-07-20 15:07:51,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:51,910 INFO L225 Difference]: With dead ends: 2315 [2020-07-20 15:07:51,910 INFO L226 Difference]: Without dead ends: 1535 [2020-07-20 15:07:51,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 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 15:07:51,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1535 states. [2020-07-20 15:07:52,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1535 to 1533. [2020-07-20 15:07:52,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1533 states. [2020-07-20 15:07:52,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1533 states to 1533 states and 2376 transitions. [2020-07-20 15:07:52,096 INFO L78 Accepts]: Start accepts. Automaton has 1533 states and 2376 transitions. Word has length 326 [2020-07-20 15:07:52,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:52,099 INFO L479 AbstractCegarLoop]: Abstraction has 1533 states and 2376 transitions. [2020-07-20 15:07:52,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:52,099 INFO L276 IsEmpty]: Start isEmpty. Operand 1533 states and 2376 transitions. [2020-07-20 15:07:52,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-20 15:07:52,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:52,113 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] [2020-07-20 15:07:52,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:52,327 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:52,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:52,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1296459700, now seen corresponding path program 1 times [2020-07-20 15:07:52,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:52,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864156581] [2020-07-20 15:07:52,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:52,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:07:52,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:52,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 1102 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:07:52,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:52,887 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 15:07:52,888 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:52,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864156581] [2020-07-20 15:07:52,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:52,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:07:52,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661241341] [2020-07-20 15:07:52,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:07:52,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:52,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:07:52,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:07:52,894 INFO L87 Difference]: Start difference. First operand 1533 states and 2376 transitions. Second operand 4 states. [2020-07-20 15:07:53,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:53,177 INFO L93 Difference]: Finished difference Result 4524 states and 7006 transitions. [2020-07-20 15:07:53,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:07:53,177 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 328 [2020-07-20 15:07:53,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:53,194 INFO L225 Difference]: With dead ends: 4524 [2020-07-20 15:07:53,195 INFO L226 Difference]: Without dead ends: 3011 [2020-07-20 15:07:53,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 325 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 15:07:53,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3011 states. [2020-07-20 15:07:53,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3011 to 3009. [2020-07-20 15:07:53,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3009 states. [2020-07-20 15:07:53,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3009 states to 3009 states and 4636 transitions. [2020-07-20 15:07:53,330 INFO L78 Accepts]: Start accepts. Automaton has 3009 states and 4636 transitions. Word has length 328 [2020-07-20 15:07:53,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:53,337 INFO L479 AbstractCegarLoop]: Abstraction has 3009 states and 4636 transitions. [2020-07-20 15:07:53,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:53,337 INFO L276 IsEmpty]: Start isEmpty. Operand 3009 states and 4636 transitions. [2020-07-20 15:07:53,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 15:07:53,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:53,348 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:07:53,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:53,565 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:53,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:53,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1561159936, now seen corresponding path program 1 times [2020-07-20 15:07:53,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:53,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787968349] [2020-07-20 15:07:53,567 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:53,791 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:07:53,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:53,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:07:53,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:53,916 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 15:07:53,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:53,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787968349] [2020-07-20 15:07:53,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:53,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:07:53,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704003926] [2020-07-20 15:07:53,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:07:53,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:53,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:07:53,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:07:53,920 INFO L87 Difference]: Start difference. First operand 3009 states and 4636 transitions. Second operand 3 states. [2020-07-20 15:07:54,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:54,118 INFO L93 Difference]: Finished difference Result 8983 states and 13842 transitions. [2020-07-20 15:07:54,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:07:54,119 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-20 15:07:54,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:54,149 INFO L225 Difference]: With dead ends: 8983 [2020-07-20 15:07:54,149 INFO L226 Difference]: Without dead ends: 5992 [2020-07-20 15:07:54,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 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 15:07:54,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5992 states. [2020-07-20 15:07:54,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5992 to 3024. [2020-07-20 15:07:54,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3024 states. [2020-07-20 15:07:54,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3024 states to 3024 states and 4657 transitions. [2020-07-20 15:07:54,340 INFO L78 Accepts]: Start accepts. Automaton has 3024 states and 4657 transitions. Word has length 330 [2020-07-20 15:07:54,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:54,341 INFO L479 AbstractCegarLoop]: Abstraction has 3024 states and 4657 transitions. [2020-07-20 15:07:54,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:07:54,341 INFO L276 IsEmpty]: Start isEmpty. Operand 3024 states and 4657 transitions. [2020-07-20 15:07:54,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2020-07-20 15:07:54,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:54,350 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] [2020-07-20 15:07:54,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:54,564 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:54,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:54,565 INFO L82 PathProgramCache]: Analyzing trace with hash -954031384, now seen corresponding path program 1 times [2020-07-20 15:07:54,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:54,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607544780] [2020-07-20 15:07:54,565 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:54,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:07:54,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:54,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 1105 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:07:54,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:55,017 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 15:07:55,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:55,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607544780] [2020-07-20 15:07:55,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:55,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:07:55,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783149888] [2020-07-20 15:07:55,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:07:55,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:55,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:07:55,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:07:55,021 INFO L87 Difference]: Start difference. First operand 3024 states and 4657 transitions. Second operand 4 states. [2020-07-20 15:07:55,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:55,376 INFO L93 Difference]: Finished difference Result 8842 states and 13597 transitions. [2020-07-20 15:07:55,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:07:55,377 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 331 [2020-07-20 15:07:55,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:55,404 INFO L225 Difference]: With dead ends: 8842 [2020-07-20 15:07:55,404 INFO L226 Difference]: Without dead ends: 5916 [2020-07-20 15:07:55,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 328 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 15:07:55,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5916 states. [2020-07-20 15:07:55,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5916 to 5914. [2020-07-20 15:07:55,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5914 states. [2020-07-20 15:07:55,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5914 states to 5914 states and 9055 transitions. [2020-07-20 15:07:55,683 INFO L78 Accepts]: Start accepts. Automaton has 5914 states and 9055 transitions. Word has length 331 [2020-07-20 15:07:55,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:55,683 INFO L479 AbstractCegarLoop]: Abstraction has 5914 states and 9055 transitions. [2020-07-20 15:07:55,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:55,684 INFO L276 IsEmpty]: Start isEmpty. Operand 5914 states and 9055 transitions. [2020-07-20 15:07:55,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 15:07:55,699 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:55,700 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:07:55,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:55,913 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:55,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:55,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1008718026, now seen corresponding path program 1 times [2020-07-20 15:07:55,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:55,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135752094] [2020-07-20 15:07:55,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:56,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:07:56,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:56,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:07:56,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:56,275 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 15:07:56,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:56,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135752094] [2020-07-20 15:07:56,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:56,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:07:56,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407365780] [2020-07-20 15:07:56,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:07:56,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:56,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:07:56,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:07:56,277 INFO L87 Difference]: Start difference. First operand 5914 states and 9055 transitions. Second operand 4 states. [2020-07-20 15:07:56,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:56,621 INFO L93 Difference]: Finished difference Result 16444 states and 25035 transitions. [2020-07-20 15:07:56,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:07:56,622 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-07-20 15:07:56,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:56,673 INFO L225 Difference]: With dead ends: 16444 [2020-07-20 15:07:56,673 INFO L226 Difference]: Without dead ends: 11070 [2020-07-20 15:07:56,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 329 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 15:07:56,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11070 states. [2020-07-20 15:07:56,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11070 to 6409. [2020-07-20 15:07:56,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6409 states. [2020-07-20 15:07:57,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6409 states to 6409 states and 9898 transitions. [2020-07-20 15:07:57,018 INFO L78 Accepts]: Start accepts. Automaton has 6409 states and 9898 transitions. Word has length 332 [2020-07-20 15:07:57,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:57,018 INFO L479 AbstractCegarLoop]: Abstraction has 6409 states and 9898 transitions. [2020-07-20 15:07:57,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:57,018 INFO L276 IsEmpty]: Start isEmpty. Operand 6409 states and 9898 transitions. [2020-07-20 15:07:57,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 15:07:57,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:57,034 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 15:07:57,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:57,249 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:57,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:57,250 INFO L82 PathProgramCache]: Analyzing trace with hash 2142282241, now seen corresponding path program 1 times [2020-07-20 15:07:57,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:57,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1344674313] [2020-07-20 15:07:57,251 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:57,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:07:57,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:57,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:07:57,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:57,629 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 15:07:57,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:57,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1344674313] [2020-07-20 15:07:57,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:57,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:07:57,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228976098] [2020-07-20 15:07:57,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:07:57,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:57,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:07:57,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:07:57,632 INFO L87 Difference]: Start difference. First operand 6409 states and 9898 transitions. Second operand 4 states. [2020-07-20 15:07:58,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:58,098 INFO L93 Difference]: Finished difference Result 17377 states and 26626 transitions. [2020-07-20 15:07:58,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:07:58,099 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 334 [2020-07-20 15:07:58,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:58,130 INFO L225 Difference]: With dead ends: 17377 [2020-07-20 15:07:58,131 INFO L226 Difference]: Without dead ends: 11917 [2020-07-20 15:07:58,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 331 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 15:07:58,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11917 states. [2020-07-20 15:07:58,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11917 to 7270. [2020-07-20 15:07:58,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7270 states. [2020-07-20 15:07:58,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7270 states to 7270 states and 11361 transitions. [2020-07-20 15:07:58,566 INFO L78 Accepts]: Start accepts. Automaton has 7270 states and 11361 transitions. Word has length 334 [2020-07-20 15:07:58,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:58,566 INFO L479 AbstractCegarLoop]: Abstraction has 7270 states and 11361 transitions. [2020-07-20 15:07:58,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:07:58,567 INFO L276 IsEmpty]: Start isEmpty. Operand 7270 states and 11361 transitions. [2020-07-20 15:07:58,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 15:07:58,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:58,585 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] [2020-07-20 15:07:58,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:58,800 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:07:58,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:07:58,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1473544871, now seen corresponding path program 1 times [2020-07-20 15:07:58,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:07:58,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261578623] [2020-07-20 15:07:58,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:07:59,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:07:59,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:07:59,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 1261 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:07:59,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:07:59,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 15:07:59,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:07:59,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261578623] [2020-07-20 15:07:59,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:07:59,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:07:59,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47459186] [2020-07-20 15:07:59,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:07:59,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:07:59,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:07:59,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:07:59,163 INFO L87 Difference]: Start difference. First operand 7270 states and 11361 transitions. Second operand 3 states. [2020-07-20 15:07:59,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:07:59,495 INFO L93 Difference]: Finished difference Result 12696 states and 19747 transitions. [2020-07-20 15:07:59,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:07:59,496 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 335 [2020-07-20 15:07:59,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:07:59,516 INFO L225 Difference]: With dead ends: 12696 [2020-07-20 15:07:59,516 INFO L226 Difference]: Without dead ends: 8823 [2020-07-20 15:07:59,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 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 15:07:59,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8823 states. [2020-07-20 15:07:59,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8823 to 8163. [2020-07-20 15:07:59,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8163 states. [2020-07-20 15:07:59,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8163 states to 8163 states and 12830 transitions. [2020-07-20 15:07:59,853 INFO L78 Accepts]: Start accepts. Automaton has 8163 states and 12830 transitions. Word has length 335 [2020-07-20 15:07:59,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:07:59,854 INFO L479 AbstractCegarLoop]: Abstraction has 8163 states and 12830 transitions. [2020-07-20 15:07:59,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:07:59,854 INFO L276 IsEmpty]: Start isEmpty. Operand 8163 states and 12830 transitions. [2020-07-20 15:07:59,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 15:07:59,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:07:59,870 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] [2020-07-20 15:08:00,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:00,084 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:00,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:00,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1890464301, now seen corresponding path program 1 times [2020-07-20 15:08:00,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:00,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957909558] [2020-07-20 15:08:00,085 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:00,308 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:08:00,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:00,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 966 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:00,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:00,396 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 15:08:00,397 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:00,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957909558] [2020-07-20 15:08:00,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:00,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:00,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330900221] [2020-07-20 15:08:00,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:00,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:00,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:00,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:00,399 INFO L87 Difference]: Start difference. First operand 8163 states and 12830 transitions. Second operand 3 states. [2020-07-20 15:08:00,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:00,800 INFO L93 Difference]: Finished difference Result 20833 states and 32154 transitions. [2020-07-20 15:08:00,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:00,800 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 15:08:00,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:00,845 INFO L225 Difference]: With dead ends: 20833 [2020-07-20 15:08:00,845 INFO L226 Difference]: Without dead ends: 14515 [2020-07-20 15:08:00,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 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 15:08:00,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14515 states. [2020-07-20 15:08:01,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14515 to 8344. [2020-07-20 15:08:01,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8344 states. [2020-07-20 15:08:01,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8344 states to 8344 states and 13051 transitions. [2020-07-20 15:08:01,279 INFO L78 Accepts]: Start accepts. Automaton has 8344 states and 13051 transitions. Word has length 336 [2020-07-20 15:08:01,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:01,279 INFO L479 AbstractCegarLoop]: Abstraction has 8344 states and 13051 transitions. [2020-07-20 15:08:01,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:01,280 INFO L276 IsEmpty]: Start isEmpty. Operand 8344 states and 13051 transitions. [2020-07-20 15:08:01,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 15:08:01,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:01,300 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] [2020-07-20 15:08:01,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:01,516 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:01,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:01,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1548531561, now seen corresponding path program 1 times [2020-07-20 15:08:01,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:01,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710430845] [2020-07-20 15:08:01,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:01,803 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:08:01,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:01,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 964 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:08:01,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:01,881 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 15:08:01,881 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:01,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710430845] [2020-07-20 15:08:01,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:01,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:08:01,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337845565] [2020-07-20 15:08:01,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:08:01,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:01,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:08:01,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:08:01,884 INFO L87 Difference]: Start difference. First operand 8344 states and 13051 transitions. Second operand 4 states. [2020-07-20 15:08:02,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:02,312 INFO L93 Difference]: Finished difference Result 21787 states and 33761 transitions. [2020-07-20 15:08:02,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:08:02,313 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 338 [2020-07-20 15:08:02,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:02,346 INFO L225 Difference]: With dead ends: 21787 [2020-07-20 15:08:02,347 INFO L226 Difference]: Without dead ends: 15312 [2020-07-20 15:08:02,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 335 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 15:08:02,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15312 states. [2020-07-20 15:08:02,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15312 to 9466. [2020-07-20 15:08:02,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9466 states. [2020-07-20 15:08:02,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9466 states to 9466 states and 14992 transitions. [2020-07-20 15:08:02,898 INFO L78 Accepts]: Start accepts. Automaton has 9466 states and 14992 transitions. Word has length 338 [2020-07-20 15:08:02,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:02,898 INFO L479 AbstractCegarLoop]: Abstraction has 9466 states and 14992 transitions. [2020-07-20 15:08:02,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:08:02,899 INFO L276 IsEmpty]: Start isEmpty. Operand 9466 states and 14992 transitions. [2020-07-20 15:08:02,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 15:08:02,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:02,910 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] [2020-07-20 15:08:03,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:03,112 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:03,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:03,112 INFO L82 PathProgramCache]: Analyzing trace with hash -2134426083, now seen corresponding path program 1 times [2020-07-20 15:08:03,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:03,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [765656143] [2020-07-20 15:08:03,114 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:03,367 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:08:03,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:03,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 1121 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 15:08:03,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:03,440 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 15:08:03,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:03,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [765656143] [2020-07-20 15:08:03,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:03,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:08:03,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679465803] [2020-07-20 15:08:03,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:08:03,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:03,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:08:03,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:08:03,442 INFO L87 Difference]: Start difference. First operand 9466 states and 14992 transitions. Second operand 4 states. [2020-07-20 15:08:03,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:03,683 INFO L93 Difference]: Finished difference Result 15397 states and 24021 transitions. [2020-07-20 15:08:03,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:08:03,683 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 338 [2020-07-20 15:08:03,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:03,701 INFO L225 Difference]: With dead ends: 15397 [2020-07-20 15:08:03,701 INFO L226 Difference]: Without dead ends: 8368 [2020-07-20 15:08:03,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 335 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 15:08:03,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8368 states. [2020-07-20 15:08:04,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8368 to 8368. [2020-07-20 15:08:04,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8368 states. [2020-07-20 15:08:04,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8368 states to 8368 states and 13192 transitions. [2020-07-20 15:08:04,152 INFO L78 Accepts]: Start accepts. Automaton has 8368 states and 13192 transitions. Word has length 338 [2020-07-20 15:08:04,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:04,153 INFO L479 AbstractCegarLoop]: Abstraction has 8368 states and 13192 transitions. [2020-07-20 15:08:04,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:08:04,153 INFO L276 IsEmpty]: Start isEmpty. Operand 8368 states and 13192 transitions. [2020-07-20 15:08:04,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 15:08:04,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:04,166 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] [2020-07-20 15:08:04,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:04,379 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:04,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:04,380 INFO L82 PathProgramCache]: Analyzing trace with hash -347871928, now seen corresponding path program 1 times [2020-07-20 15:08:04,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:04,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482525083] [2020-07-20 15:08:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:04,659 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:08:04,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:04,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 1265 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:04,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:04,772 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 15:08:04,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:04,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482525083] [2020-07-20 15:08:04,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:04,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:04,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117594240] [2020-07-20 15:08:04,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:04,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:04,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:04,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:04,774 INFO L87 Difference]: Start difference. First operand 8368 states and 13192 transitions. Second operand 3 states. [2020-07-20 15:08:05,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:05,271 INFO L93 Difference]: Finished difference Result 20552 states and 31764 transitions. [2020-07-20 15:08:05,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:05,272 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 338 [2020-07-20 15:08:05,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:05,297 INFO L225 Difference]: With dead ends: 20552 [2020-07-20 15:08:05,298 INFO L226 Difference]: Without dead ends: 14710 [2020-07-20 15:08:05,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 336 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 15:08:05,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14710 states. [2020-07-20 15:08:06,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14710 to 14708. [2020-07-20 15:08:06,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14708 states. [2020-07-20 15:08:06,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14708 states to 14708 states and 22753 transitions. [2020-07-20 15:08:06,377 INFO L78 Accepts]: Start accepts. Automaton has 14708 states and 22753 transitions. Word has length 338 [2020-07-20 15:08:06,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:06,377 INFO L479 AbstractCegarLoop]: Abstraction has 14708 states and 22753 transitions. [2020-07-20 15:08:06,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:06,377 INFO L276 IsEmpty]: Start isEmpty. Operand 14708 states and 22753 transitions. [2020-07-20 15:08:06,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 15:08:06,392 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:06,392 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] [2020-07-20 15:08:06,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:06,593 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:06,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:06,594 INFO L82 PathProgramCache]: Analyzing trace with hash 651764761, now seen corresponding path program 1 times [2020-07-20 15:08:06,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:06,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210963635] [2020-07-20 15:08:06,595 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:06,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:08:06,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:06,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1266 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:06,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:06,977 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 15:08:06,977 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:06,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210963635] [2020-07-20 15:08:06,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:06,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:06,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170359728] [2020-07-20 15:08:06,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:06,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:06,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:06,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:06,980 INFO L87 Difference]: Start difference. First operand 14708 states and 22753 transitions. Second operand 3 states. [2020-07-20 15:08:08,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:08,374 INFO L93 Difference]: Finished difference Result 38009 states and 57927 transitions. [2020-07-20 15:08:08,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:08,374 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 339 [2020-07-20 15:08:08,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:08,409 INFO L225 Difference]: With dead ends: 38009 [2020-07-20 15:08:08,409 INFO L226 Difference]: Without dead ends: 26673 [2020-07-20 15:08:08,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 337 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 15:08:08,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26673 states. [2020-07-20 15:08:09,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26673 to 26571. [2020-07-20 15:08:09,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26571 states. [2020-07-20 15:08:09,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26571 states to 26571 states and 40457 transitions. [2020-07-20 15:08:09,511 INFO L78 Accepts]: Start accepts. Automaton has 26571 states and 40457 transitions. Word has length 339 [2020-07-20 15:08:09,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:09,511 INFO L479 AbstractCegarLoop]: Abstraction has 26571 states and 40457 transitions. [2020-07-20 15:08:09,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:09,511 INFO L276 IsEmpty]: Start isEmpty. Operand 26571 states and 40457 transitions. [2020-07-20 15:08:09,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 15:08:09,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:09,531 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] [2020-07-20 15:08:09,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:09,732 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:09,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:09,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1180233656, now seen corresponding path program 1 times [2020-07-20 15:08:09,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:09,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434018344] [2020-07-20 15:08:09,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:09,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:08:09,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:09,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 976 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:08:09,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:10,142 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 15:08:10,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:10,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434018344] [2020-07-20 15:08:10,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:10,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:08:10,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323217747] [2020-07-20 15:08:10,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:08:10,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:10,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:08:10,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:08:10,145 INFO L87 Difference]: Start difference. First operand 26571 states and 40457 transitions. Second operand 9 states. [2020-07-20 15:08:21,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:21,335 INFO L93 Difference]: Finished difference Result 154949 states and 239966 transitions. [2020-07-20 15:08:21,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 15:08:21,335 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 340 [2020-07-20 15:08:21,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:21,499 INFO L225 Difference]: With dead ends: 154949 [2020-07-20 15:08:21,499 INFO L226 Difference]: Without dead ends: 148403 [2020-07-20 15:08:21,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 15:08:21,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148403 states. [2020-07-20 15:08:26,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148403 to 59471. [2020-07-20 15:08:26,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59471 states. [2020-07-20 15:08:26,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59471 states to 59471 states and 91273 transitions. [2020-07-20 15:08:26,182 INFO L78 Accepts]: Start accepts. Automaton has 59471 states and 91273 transitions. Word has length 340 [2020-07-20 15:08:26,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:26,183 INFO L479 AbstractCegarLoop]: Abstraction has 59471 states and 91273 transitions. [2020-07-20 15:08:26,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 15:08:26,183 INFO L276 IsEmpty]: Start isEmpty. Operand 59471 states and 91273 transitions. [2020-07-20 15:08:26,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2020-07-20 15:08:26,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:26,215 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] [2020-07-20 15:08:26,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:26,429 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:26,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:26,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1695834328, now seen corresponding path program 1 times [2020-07-20 15:08:26,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:26,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186878670] [2020-07-20 15:08:26,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:26,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:08:26,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:26,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 1266 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:26,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:27,099 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 15:08:27,099 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:27,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186878670] [2020-07-20 15:08:27,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:27,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:27,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825309732] [2020-07-20 15:08:27,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:27,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:27,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:27,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:27,101 INFO L87 Difference]: Start difference. First operand 59471 states and 91273 transitions. Second operand 3 states. [2020-07-20 15:08:33,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:33,069 INFO L93 Difference]: Finished difference Result 158747 states and 242778 transitions. [2020-07-20 15:08:33,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:33,070 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 340 [2020-07-20 15:08:33,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:33,193 INFO L225 Difference]: With dead ends: 158747 [2020-07-20 15:08:33,194 INFO L226 Difference]: Without dead ends: 103985 [2020-07-20 15:08:33,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 338 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 15:08:33,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103985 states. [2020-07-20 15:08:37,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103985 to 103497. [2020-07-20 15:08:37,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103497 states. [2020-07-20 15:08:38,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103497 states to 103497 states and 157557 transitions. [2020-07-20 15:08:38,122 INFO L78 Accepts]: Start accepts. Automaton has 103497 states and 157557 transitions. Word has length 340 [2020-07-20 15:08:38,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:38,123 INFO L479 AbstractCegarLoop]: Abstraction has 103497 states and 157557 transitions. [2020-07-20 15:08:38,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:38,123 INFO L276 IsEmpty]: Start isEmpty. Operand 103497 states and 157557 transitions. [2020-07-20 15:08:38,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2020-07-20 15:08:38,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:38,176 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] [2020-07-20 15:08:38,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:38,377 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:38,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:38,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1792175628, now seen corresponding path program 1 times [2020-07-20 15:08:38,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:38,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876431579] [2020-07-20 15:08:38,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:38,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:08:38,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:38,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 1127 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:08:38,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:38,702 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 15:08:38,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:38,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876431579] [2020-07-20 15:08:38,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:38,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:08:38,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611993427] [2020-07-20 15:08:38,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:08:38,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:38,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:08:38,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:08:38,704 INFO L87 Difference]: Start difference. First operand 103497 states and 157557 transitions. Second operand 3 states. [2020-07-20 15:08:47,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:08:47,680 INFO L93 Difference]: Finished difference Result 263878 states and 400372 transitions. [2020-07-20 15:08:47,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:08:47,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 342 [2020-07-20 15:08:47,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:08:47,924 INFO L225 Difference]: With dead ends: 263878 [2020-07-20 15:08:47,924 INFO L226 Difference]: Without dead ends: 174998 [2020-07-20 15:08:48,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 340 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 15:08:48,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174998 states. [2020-07-20 15:08:56,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174998 to 104031. [2020-07-20 15:08:56,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104031 states. [2020-07-20 15:08:56,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104031 states to 104031 states and 158147 transitions. [2020-07-20 15:08:56,150 INFO L78 Accepts]: Start accepts. Automaton has 104031 states and 158147 transitions. Word has length 342 [2020-07-20 15:08:56,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:08:56,150 INFO L479 AbstractCegarLoop]: Abstraction has 104031 states and 158147 transitions. [2020-07-20 15:08:56,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:08:56,150 INFO L276 IsEmpty]: Start isEmpty. Operand 104031 states and 158147 transitions. [2020-07-20 15:08:56,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-20 15:08:56,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:08:56,196 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] [2020-07-20 15:08:56,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:56,397 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:08:56,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:08:56,398 INFO L82 PathProgramCache]: Analyzing trace with hash 744172444, now seen corresponding path program 1 times [2020-07-20 15:08:56,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:08:56,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096624777] [2020-07-20 15:08:56,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:08:56,652 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 15:08:56,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:08:56,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1126 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 15:08:56,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:08:56,723 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 15:08:56,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:08:56,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096624777] [2020-07-20 15:08:56,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:08:56,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 15:08:56,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420320977] [2020-07-20 15:08:56,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 15:08:56,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:08:56,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 15:08:56,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 15:08:56,725 INFO L87 Difference]: Start difference. First operand 104031 states and 158147 transitions. Second operand 4 states. [2020-07-20 15:09:02,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:09:02,466 INFO L93 Difference]: Finished difference Result 217254 states and 330067 transitions. [2020-07-20 15:09:02,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 15:09:02,466 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 343 [2020-07-20 15:09:02,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:09:02,628 INFO L225 Difference]: With dead ends: 217254 [2020-07-20 15:09:02,628 INFO L226 Difference]: Without dead ends: 109654 [2020-07-20 15:09:02,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 340 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 15:09:02,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109654 states. [2020-07-20 15:09:11,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109654 to 109652. [2020-07-20 15:09:11,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109652 states. [2020-07-20 15:09:11,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109652 states to 109652 states and 165636 transitions. [2020-07-20 15:09:11,201 INFO L78 Accepts]: Start accepts. Automaton has 109652 states and 165636 transitions. Word has length 343 [2020-07-20 15:09:11,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:09:11,201 INFO L479 AbstractCegarLoop]: Abstraction has 109652 states and 165636 transitions. [2020-07-20 15:09:11,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 15:09:11,201 INFO L276 IsEmpty]: Start isEmpty. Operand 109652 states and 165636 transitions. [2020-07-20 15:09:11,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-20 15:09:11,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:09:11,253 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] [MP z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (17)] Forcibly destroying the process [2020-07-20 15:09:11,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:09:11,476 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:09:11,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:09:11,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1700569717, now seen corresponding path program 1 times [2020-07-20 15:09:11,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:09:11,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824442529] [2020-07-20 15:09:11,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:09:11,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:09:11,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:09:11,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 1281 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:09:11,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:09:11,845 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 15:09:11,846 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:09:11,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824442529] [2020-07-20 15:09:11,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:09:11,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:09:11,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234556837] [2020-07-20 15:09:11,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:09:11,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:09:11,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:09:11,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:09:11,848 INFO L87 Difference]: Start difference. First operand 109652 states and 165636 transitions. Second operand 3 states. [2020-07-20 15:09:22,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:09:22,137 INFO L93 Difference]: Finished difference Result 312959 states and 471046 transitions. [2020-07-20 15:09:22,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:09:22,137 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 344 [2020-07-20 15:09:22,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:09:22,378 INFO L225 Difference]: With dead ends: 312959 [2020-07-20 15:09:22,379 INFO L226 Difference]: Without dead ends: 211878 [2020-07-20 15:09:22,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 342 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 15:09:22,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211878 states. [2020-07-20 15:09:37,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211878 to 211628. [2020-07-20 15:09:37,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211628 states. [2020-07-20 15:09:37,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211628 states to 211628 states and 317205 transitions. [2020-07-20 15:09:37,562 INFO L78 Accepts]: Start accepts. Automaton has 211628 states and 317205 transitions. Word has length 344 [2020-07-20 15:09:37,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:09:37,563 INFO L479 AbstractCegarLoop]: Abstraction has 211628 states and 317205 transitions. [2020-07-20 15:09:37,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:09:37,563 INFO L276 IsEmpty]: Start isEmpty. Operand 211628 states and 317205 transitions. [2020-07-20 15:09:37,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 15:09:37,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:09:37,661 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] [2020-07-20 15:09:37,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:09:37,862 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:09:37,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:09:37,863 INFO L82 PathProgramCache]: Analyzing trace with hash 355465202, now seen corresponding path program 1 times [2020-07-20 15:09:37,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:09:37,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869642330] [2020-07-20 15:09:37,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:09:38,096 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 15:09:38,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:09:38,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 992 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:09:38,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:09:38,217 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 15:09:38,217 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:09:38,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869642330] [2020-07-20 15:09:38,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:09:38,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:09:38,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911211575] [2020-07-20 15:09:38,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:09:38,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:09:38,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:09:38,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:09:38,219 INFO L87 Difference]: Start difference. First operand 211628 states and 317205 transitions. Second operand 9 states. [2020-07-20 15:11:11,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:11:11,217 INFO L93 Difference]: Finished difference Result 1329658 states and 2030619 transitions. [2020-07-20 15:11:11,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 15:11:11,218 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 345 [2020-07-20 15:11:11,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:11:13,019 INFO L225 Difference]: With dead ends: 1329658 [2020-07-20 15:11:13,020 INFO L226 Difference]: Without dead ends: 1255524 [2020-07-20 15:11:13,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=317, Invalid=873, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 15:11:14,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1255524 states. [2020-07-20 15:12:23,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1255524 to 552310. [2020-07-20 15:12:23,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 552310 states. [2020-07-20 15:12:24,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552310 states to 552310 states and 835007 transitions. [2020-07-20 15:12:24,068 INFO L78 Accepts]: Start accepts. Automaton has 552310 states and 835007 transitions. Word has length 345 [2020-07-20 15:12:24,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:12:24,068 INFO L479 AbstractCegarLoop]: Abstraction has 552310 states and 835007 transitions. [2020-07-20 15:12:24,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 15:12:24,068 INFO L276 IsEmpty]: Start isEmpty. Operand 552310 states and 835007 transitions. [2020-07-20 15:12:24,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 15:12:24,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:12:24,327 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] [2020-07-20 15:12:24,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:12:24,528 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:12:24,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:12:24,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1398854667, now seen corresponding path program 1 times [2020-07-20 15:12:24,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:12:24,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469682959] [2020-07-20 15:12:24,530 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:12:24,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:12:24,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:12:24,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 1282 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 15:12:24,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:12:24,871 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 15:12:24,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:12:24,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469682959] [2020-07-20 15:12:24,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:12:24,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 15:12:24,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956793096] [2020-07-20 15:12:24,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 15:12:24,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:12:24,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 15:12:24,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 15:12:24,873 INFO L87 Difference]: Start difference. First operand 552310 states and 835007 transitions. Second operand 3 states. [2020-07-20 15:13:40,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 15:13:40,988 INFO L93 Difference]: Finished difference Result 1384730 states and 2107229 transitions. [2020-07-20 15:13:40,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 15:13:40,989 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 345 [2020-07-20 15:13:40,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 15:13:42,316 INFO L225 Difference]: With dead ends: 1384730 [2020-07-20 15:13:42,316 INFO L226 Difference]: Without dead ends: 872816 [2020-07-20 15:13:42,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 343 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 15:13:43,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 872816 states. [2020-07-20 15:15:06,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 872816 to 757650. [2020-07-20 15:15:06,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 757650 states. [2020-07-20 15:15:08,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 757650 states to 757650 states and 1160247 transitions. [2020-07-20 15:15:08,074 INFO L78 Accepts]: Start accepts. Automaton has 757650 states and 1160247 transitions. Word has length 345 [2020-07-20 15:15:08,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 15:15:08,075 INFO L479 AbstractCegarLoop]: Abstraction has 757650 states and 1160247 transitions. [2020-07-20 15:15:08,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 15:15:08,075 INFO L276 IsEmpty]: Start isEmpty. Operand 757650 states and 1160247 transitions. [2020-07-20 15:15:08,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-20 15:15:08,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 15:15:08,303 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] [2020-07-20 15:15:08,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 15:15:08,509 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 15:15:08,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 15:15:08,510 INFO L82 PathProgramCache]: Analyzing trace with hash -653971524, now seen corresponding path program 1 times [2020-07-20 15:15:08,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 15:15:08,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702783809] [2020-07-20 15:15:08,511 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:15:08,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 15:15:08,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 15:15:08,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 1285 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 15:15:08,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 15:15:08,909 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 15:15:08,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 15:15:08,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702783809] [2020-07-20 15:15:08,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 15:15:08,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 15:15:08,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612851184] [2020-07-20 15:15:08,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 15:15:08,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 15:15:08,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 15:15:08,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 15:15:08,911 INFO L87 Difference]: Start difference. First operand 757650 states and 1160247 transitions. Second operand 9 states.