/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 BIGGEST_EQUIVALENCE_CLASS --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_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:47:59,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:47:59,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:47:59,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:47:59,555 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:47:59,556 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:47:59,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:47:59,559 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:47:59,561 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:47:59,561 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:47:59,562 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:47:59,563 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:47:59,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:47:59,565 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:47:59,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:47:59,567 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:47:59,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:47:59,568 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:47:59,570 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:47:59,572 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:47:59,574 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:47:59,575 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:47:59,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:47:59,577 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:47:59,579 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 23:47:59,579 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 23:47:59,580 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 23:47:59,580 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 23:47:59,581 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 23:47:59,582 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 23:47:59,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 23:47:59,583 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 23:47:59,584 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 23:47:59,584 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 23:47:59,588 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 23:47:59,588 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 23:47:59,589 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 23:47:59,589 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 23:47:59,589 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:47:59,590 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:47:59,591 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:47:59,591 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:47:59,606 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:47:59,606 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:47:59,607 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:47:59,608 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:47:59,608 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:47:59,608 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:47:59,608 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:47:59,609 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:47:59,610 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:47:59,610 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:47:59,610 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:47:59,610 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:47:59,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:47:59,611 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:47:59,611 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:47:59,611 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:47:59,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:47:59,611 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:47:59,612 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:47:59,613 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:47:59,951 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:47:59,967 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:47:59,970 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:47:59,974 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:47:59,974 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:47:59,976 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:48:00,047 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62fd1f60a/30d36f33247448d8922178074ccf998b/FLAG892308e6e [2020-07-21 23:48:00,718 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:48:00,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:48:00,740 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62fd1f60a/30d36f33247448d8922178074ccf998b/FLAG892308e6e [2020-07-21 23:48:00,953 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62fd1f60a/30d36f33247448d8922178074ccf998b [2020-07-21 23:48:00,962 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:48:00,965 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:48:00,966 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:48:00,966 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:48:00,969 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:48:00,971 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:48:00" (1/1) ... [2020-07-21 23:48:00,973 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ec6c3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:00, skipping insertion in model container [2020-07-21 23:48:00,974 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:48:00" (1/1) ... [2020-07-21 23:48:00,981 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:48:01,143 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:48:02,534 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:48:02,549 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:48:03,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:48:03,806 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:48:03,806 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03 WrapperNode [2020-07-21 23:48:03,806 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:48:03,807 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:48:03,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:48:03,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:48:03,822 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,822 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,857 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,857 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,925 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,971 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:03,990 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... [2020-07-21 23:48:04,011 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:48:04,012 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:48:04,012 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:48:04,013 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:48:04,014 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:48:04,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:48:04,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:48:04,084 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:48:04,084 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:48:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:48:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 23:48:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 23:48:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:48:04,085 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 23:48:04,086 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:48:04,086 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:48:04,086 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 23:48:04,086 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 23:48:04,087 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 23:48:04,087 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 23:48:04,087 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 23:48:04,087 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 23:48:04,087 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 23:48:04,088 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 23:48:04,088 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 23:48:04,088 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:48:04,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:48:04,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:48:07,811 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:48:07,811 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 23:48:07,830 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:48:07 BoogieIcfgContainer [2020-07-21 23:48:07,830 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:48:07,832 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:48:07,833 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:48:07,836 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:48:07,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:48:00" (1/3) ... [2020-07-21 23:48:07,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5924a5f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:48:07, skipping insertion in model container [2020-07-21 23:48:07,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:48:03" (2/3) ... [2020-07-21 23:48:07,838 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5924a5f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:48:07, skipping insertion in model container [2020-07-21 23:48:07,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:48:07" (3/3) ... [2020-07-21 23:48:07,842 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:48:07,855 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:48:07,869 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:48:07,884 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:48:07,920 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:48:07,920 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:48:07,920 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:48:07,920 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:48:07,920 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:48:07,920 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:48:07,921 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:48:07,921 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:48:07,963 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states. [2020-07-21 23:48:08,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-21 23:48:08,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:08,011 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:08,011 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:08,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:08,018 INFO L82 PathProgramCache]: Analyzing trace with hash -866812329, now seen corresponding path program 1 times [2020-07-21 23:48:08,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:08,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449177829] [2020-07-21 23:48:08,028 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 [2020-07-21 23:48:08,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:08,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:08,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 2026 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:08,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:09,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:09,049 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:09,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449177829] [2020-07-21 23:48:09,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:09,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:09,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332328653] [2020-07-21 23:48:09,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:09,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:09,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:09,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:09,072 INFO L87 Difference]: Start difference. First operand 1340 states. Second operand 4 states. [2020-07-21 23:48:09,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:09,556 INFO L93 Difference]: Finished difference Result 3962 states and 7141 transitions. [2020-07-21 23:48:09,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:48:09,558 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 476 [2020-07-21 23:48:09,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:09,590 INFO L225 Difference]: With dead ends: 3962 [2020-07-21 23:48:09,590 INFO L226 Difference]: Without dead ends: 2633 [2020-07-21 23:48:09,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:09,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2633 states. [2020-07-21 23:48:09,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2633 to 2631. [2020-07-21 23:48:09,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2631 states. [2020-07-21 23:48:09,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2631 states to 2631 states and 4309 transitions. [2020-07-21 23:48:09,823 INFO L78 Accepts]: Start accepts. Automaton has 2631 states and 4309 transitions. Word has length 476 [2020-07-21 23:48:09,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:09,824 INFO L479 AbstractCegarLoop]: Abstraction has 2631 states and 4309 transitions. [2020-07-21 23:48:09,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:09,825 INFO L276 IsEmpty]: Start isEmpty. Operand 2631 states and 4309 transitions. [2020-07-21 23:48:09,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-21 23:48:09,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:09,864 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:10,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:10,078 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:10,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:10,079 INFO L82 PathProgramCache]: Analyzing trace with hash 627814464, now seen corresponding path program 1 times [2020-07-21 23:48:10,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:10,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482787952] [2020-07-21 23:48:10,080 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 [2020-07-21 23:48:10,520 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:10,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:10,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 2029 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:10,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:10,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:10,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:10,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482787952] [2020-07-21 23:48:10,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:10,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:10,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957073658] [2020-07-21 23:48:10,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:10,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:10,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:10,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:10,865 INFO L87 Difference]: Start difference. First operand 2631 states and 4309 transitions. Second operand 3 states. [2020-07-21 23:48:11,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:11,170 INFO L93 Difference]: Finished difference Result 7643 states and 12488 transitions. [2020-07-21 23:48:11,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:11,171 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-21 23:48:11,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:11,200 INFO L225 Difference]: With dead ends: 7643 [2020-07-21 23:48:11,201 INFO L226 Difference]: Without dead ends: 5175 [2020-07-21 23:48:11,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:11,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5175 states. [2020-07-21 23:48:11,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5175 to 5173. [2020-07-21 23:48:11,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5173 states. [2020-07-21 23:48:11,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5173 states to 5173 states and 8441 transitions. [2020-07-21 23:48:11,397 INFO L78 Accepts]: Start accepts. Automaton has 5173 states and 8441 transitions. Word has length 478 [2020-07-21 23:48:11,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:11,398 INFO L479 AbstractCegarLoop]: Abstraction has 5173 states and 8441 transitions. [2020-07-21 23:48:11,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:11,399 INFO L276 IsEmpty]: Start isEmpty. Operand 5173 states and 8441 transitions. [2020-07-21 23:48:11,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 23:48:11,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:11,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:11,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:11,633 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:11,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:11,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1435918110, now seen corresponding path program 1 times [2020-07-21 23:48:11,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:11,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979196806] [2020-07-21 23:48:11,636 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 [2020-07-21 23:48:12,032 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:12,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:12,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 1659 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:12,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:12,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:12,154 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:12,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979196806] [2020-07-21 23:48:12,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:12,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:12,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714473520] [2020-07-21 23:48:12,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:12,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:12,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:12,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:12,157 INFO L87 Difference]: Start difference. First operand 5173 states and 8441 transitions. Second operand 3 states. [2020-07-21 23:48:12,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:12,528 INFO L93 Difference]: Finished difference Result 15352 states and 25024 transitions. [2020-07-21 23:48:12,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:12,528 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 479 [2020-07-21 23:48:12,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:12,578 INFO L225 Difference]: With dead ends: 15352 [2020-07-21 23:48:12,578 INFO L226 Difference]: Without dead ends: 10203 [2020-07-21 23:48:12,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:12,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10203 states. [2020-07-21 23:48:12,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10203 to 5198. [2020-07-21 23:48:12,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5198 states. [2020-07-21 23:48:12,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5198 states to 5198 states and 8479 transitions. [2020-07-21 23:48:12,949 INFO L78 Accepts]: Start accepts. Automaton has 5198 states and 8479 transitions. Word has length 479 [2020-07-21 23:48:12,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:12,949 INFO L479 AbstractCegarLoop]: Abstraction has 5198 states and 8479 transitions. [2020-07-21 23:48:12,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:12,950 INFO L276 IsEmpty]: Start isEmpty. Operand 5198 states and 8479 transitions. [2020-07-21 23:48:12,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 481 [2020-07-21 23:48:12,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:12,965 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:13,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:13,179 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:13,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:13,179 INFO L82 PathProgramCache]: Analyzing trace with hash 243773179, now seen corresponding path program 1 times [2020-07-21 23:48:13,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:13,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167537493] [2020-07-21 23:48:13,180 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 [2020-07-21 23:48:13,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:13,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:13,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:13,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:13,737 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:13,738 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:13,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167537493] [2020-07-21 23:48:13,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:13,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:13,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864233468] [2020-07-21 23:48:13,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:13,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:13,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:13,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:13,741 INFO L87 Difference]: Start difference. First operand 5198 states and 8479 transitions. Second operand 4 states. [2020-07-21 23:48:14,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:14,179 INFO L93 Difference]: Finished difference Result 12409 states and 20445 transitions. [2020-07-21 23:48:14,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:14,180 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 480 [2020-07-21 23:48:14,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:14,237 INFO L225 Difference]: With dead ends: 12409 [2020-07-21 23:48:14,238 INFO L226 Difference]: Without dead ends: 6263 [2020-07-21 23:48:14,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:14,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6263 states. [2020-07-21 23:48:14,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6263 to 6261. [2020-07-21 23:48:14,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6261 states. [2020-07-21 23:48:14,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6261 states to 6261 states and 10281 transitions. [2020-07-21 23:48:14,622 INFO L78 Accepts]: Start accepts. Automaton has 6261 states and 10281 transitions. Word has length 480 [2020-07-21 23:48:14,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:14,622 INFO L479 AbstractCegarLoop]: Abstraction has 6261 states and 10281 transitions. [2020-07-21 23:48:14,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:14,624 INFO L276 IsEmpty]: Start isEmpty. Operand 6261 states and 10281 transitions. [2020-07-21 23:48:14,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-21 23:48:14,649 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:14,649 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:14,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:14,863 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:14,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:14,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1498996073, now seen corresponding path program 1 times [2020-07-21 23:48:14,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:14,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969618049] [2020-07-21 23:48:14,866 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 [2020-07-21 23:48:15,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:15,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:15,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 2032 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:15,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:15,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:15,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:15,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969618049] [2020-07-21 23:48:15,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:15,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:15,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932409129] [2020-07-21 23:48:15,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:15,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:15,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:15,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:15,676 INFO L87 Difference]: Start difference. First operand 6261 states and 10281 transitions. Second operand 3 states. [2020-07-21 23:48:16,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:16,129 INFO L93 Difference]: Finished difference Result 18148 states and 29728 transitions. [2020-07-21 23:48:16,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:16,129 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 481 [2020-07-21 23:48:16,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:16,163 INFO L225 Difference]: With dead ends: 18148 [2020-07-21 23:48:16,166 INFO L226 Difference]: Without dead ends: 12418 [2020-07-21 23:48:16,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:16,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12418 states. [2020-07-21 23:48:16,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12418 to 12416. [2020-07-21 23:48:16,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12416 states. [2020-07-21 23:48:16,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12416 states to 12416 states and 20316 transitions. [2020-07-21 23:48:16,682 INFO L78 Accepts]: Start accepts. Automaton has 12416 states and 20316 transitions. Word has length 481 [2020-07-21 23:48:16,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:16,682 INFO L479 AbstractCegarLoop]: Abstraction has 12416 states and 20316 transitions. [2020-07-21 23:48:16,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:16,683 INFO L276 IsEmpty]: Start isEmpty. Operand 12416 states and 20316 transitions. [2020-07-21 23:48:16,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-21 23:48:16,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:16,795 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:16,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:16,996 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:16,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:16,997 INFO L82 PathProgramCache]: Analyzing trace with hash -510314348, now seen corresponding path program 1 times [2020-07-21 23:48:16,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:16,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [150203216] [2020-07-21 23:48:16,998 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 [2020-07-21 23:48:17,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:17,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:17,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1661 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:17,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:17,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:17,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:17,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [150203216] [2020-07-21 23:48:17,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:17,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:17,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487023210] [2020-07-21 23:48:17,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:17,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:17,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:17,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:17,457 INFO L87 Difference]: Start difference. First operand 12416 states and 20316 transitions. Second operand 3 states. [2020-07-21 23:48:18,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:18,628 INFO L93 Difference]: Finished difference Result 37088 states and 60680 transitions. [2020-07-21 23:48:18,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:18,628 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 482 [2020-07-21 23:48:18,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:18,698 INFO L225 Difference]: With dead ends: 37088 [2020-07-21 23:48:18,698 INFO L226 Difference]: Without dead ends: 24762 [2020-07-21 23:48:18,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:18,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24762 states. [2020-07-21 23:48:19,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24762 to 12494. [2020-07-21 23:48:19,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12494 states. [2020-07-21 23:48:19,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12494 states to 12494 states and 20436 transitions. [2020-07-21 23:48:19,306 INFO L78 Accepts]: Start accepts. Automaton has 12494 states and 20436 transitions. Word has length 482 [2020-07-21 23:48:19,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:19,306 INFO L479 AbstractCegarLoop]: Abstraction has 12494 states and 20436 transitions. [2020-07-21 23:48:19,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:19,306 INFO L276 IsEmpty]: Start isEmpty. Operand 12494 states and 20436 transitions. [2020-07-21 23:48:19,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-21 23:48:19,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:19,332 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:19,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:19,547 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:19,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:19,548 INFO L82 PathProgramCache]: Analyzing trace with hash -591903806, now seen corresponding path program 1 times [2020-07-21 23:48:19,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:19,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056651999] [2020-07-21 23:48:19,549 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 [2020-07-21 23:48:19,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:19,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:19,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:19,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:20,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:20,129 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:20,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056651999] [2020-07-21 23:48:20,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:20,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:20,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333851735] [2020-07-21 23:48:20,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:20,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:20,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:20,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:20,132 INFO L87 Difference]: Start difference. First operand 12494 states and 20436 transitions. Second operand 3 states. [2020-07-21 23:48:20,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:20,633 INFO L93 Difference]: Finished difference Result 36734 states and 60028 transitions. [2020-07-21 23:48:20,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:20,634 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-21 23:48:20,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:20,696 INFO L225 Difference]: With dead ends: 36734 [2020-07-21 23:48:20,697 INFO L226 Difference]: Without dead ends: 24620 [2020-07-21 23:48:20,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:20,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24620 states. [2020-07-21 23:48:21,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24620 to 12646. [2020-07-21 23:48:21,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12646 states. [2020-07-21 23:48:21,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12646 states to 12646 states and 20660 transitions. [2020-07-21 23:48:21,345 INFO L78 Accepts]: Start accepts. Automaton has 12646 states and 20660 transitions. Word has length 483 [2020-07-21 23:48:21,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:21,345 INFO L479 AbstractCegarLoop]: Abstraction has 12646 states and 20660 transitions. [2020-07-21 23:48:21,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:21,346 INFO L276 IsEmpty]: Start isEmpty. Operand 12646 states and 20660 transitions. [2020-07-21 23:48:21,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-21 23:48:21,454 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:21,454 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:21,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:21,657 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:21,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:21,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1577617943, now seen corresponding path program 1 times [2020-07-21 23:48:21,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:21,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919649579] [2020-07-21 23:48:21,659 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 [2020-07-21 23:48:22,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:22,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:22,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1659 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:22,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:22,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:22,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:22,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919649579] [2020-07-21 23:48:22,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:22,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:22,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966172808] [2020-07-21 23:48:22,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:22,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:22,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:22,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:22,144 INFO L87 Difference]: Start difference. First operand 12646 states and 20660 transitions. Second operand 3 states. [2020-07-21 23:48:22,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:22,782 INFO L93 Difference]: Finished difference Result 37433 states and 61125 transitions. [2020-07-21 23:48:22,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:22,783 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-21 23:48:22,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:22,820 INFO L225 Difference]: With dead ends: 37433 [2020-07-21 23:48:22,820 INFO L226 Difference]: Without dead ends: 25008 [2020-07-21 23:48:22,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:22,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25008 states. [2020-07-21 23:48:23,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25008 to 12742. [2020-07-21 23:48:23,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12742 states. [2020-07-21 23:48:23,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12742 states to 12742 states and 20781 transitions. [2020-07-21 23:48:23,394 INFO L78 Accepts]: Start accepts. Automaton has 12742 states and 20781 transitions. Word has length 483 [2020-07-21 23:48:23,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:23,395 INFO L479 AbstractCegarLoop]: Abstraction has 12742 states and 20781 transitions. [2020-07-21 23:48:23,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:23,395 INFO L276 IsEmpty]: Start isEmpty. Operand 12742 states and 20781 transitions. [2020-07-21 23:48:23,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 23:48:23,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:23,412 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:23,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:23,613 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:23,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:23,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1705621311, now seen corresponding path program 1 times [2020-07-21 23:48:23,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:23,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504020791] [2020-07-21 23:48:23,617 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 [2020-07-21 23:48:24,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:24,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:24,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 2031 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:24,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:24,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:24,254 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:24,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504020791] [2020-07-21 23:48:24,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:24,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:24,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507479401] [2020-07-21 23:48:24,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:24,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:24,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:24,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:24,257 INFO L87 Difference]: Start difference. First operand 12742 states and 20781 transitions. Second operand 3 states. [2020-07-21 23:48:25,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:25,084 INFO L93 Difference]: Finished difference Result 35984 states and 58565 transitions. [2020-07-21 23:48:25,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:25,085 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 484 [2020-07-21 23:48:25,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:25,125 INFO L225 Difference]: With dead ends: 35984 [2020-07-21 23:48:25,125 INFO L226 Difference]: Without dead ends: 24776 [2020-07-21 23:48:25,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:25,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24776 states. [2020-07-21 23:48:25,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24776 to 24774. [2020-07-21 23:48:25,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24774 states. [2020-07-21 23:48:26,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24774 states to 24774 states and 40275 transitions. [2020-07-21 23:48:26,779 INFO L78 Accepts]: Start accepts. Automaton has 24774 states and 40275 transitions. Word has length 484 [2020-07-21 23:48:26,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:26,780 INFO L479 AbstractCegarLoop]: Abstraction has 24774 states and 40275 transitions. [2020-07-21 23:48:26,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:26,780 INFO L276 IsEmpty]: Start isEmpty. Operand 24774 states and 40275 transitions. [2020-07-21 23:48:26,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 23:48:26,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:26,801 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:27,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:27,002 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:27,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:27,003 INFO L82 PathProgramCache]: Analyzing trace with hash -592104494, now seen corresponding path program 1 times [2020-07-21 23:48:27,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:27,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357709329] [2020-07-21 23:48:27,004 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 [2020-07-21 23:48:27,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:27,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:27,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1660 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:27,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:27,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:27,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:27,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357709329] [2020-07-21 23:48:27,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:27,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:27,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012773115] [2020-07-21 23:48:27,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:27,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:27,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:27,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:27,491 INFO L87 Difference]: Start difference. First operand 24774 states and 40275 transitions. Second operand 3 states. [2020-07-21 23:48:29,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:29,336 INFO L93 Difference]: Finished difference Result 72103 states and 117017 transitions. [2020-07-21 23:48:29,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:29,336 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 23:48:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:29,397 INFO L225 Difference]: With dead ends: 72103 [2020-07-21 23:48:29,397 INFO L226 Difference]: Without dead ends: 47503 [2020-07-21 23:48:29,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:29,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47503 states. [2020-07-21 23:48:30,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47503 to 24695. [2020-07-21 23:48:30,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24695 states. [2020-07-21 23:48:30,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24695 states to 24695 states and 40136 transitions. [2020-07-21 23:48:30,401 INFO L78 Accepts]: Start accepts. Automaton has 24695 states and 40136 transitions. Word has length 485 [2020-07-21 23:48:30,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:30,401 INFO L479 AbstractCegarLoop]: Abstraction has 24695 states and 40136 transitions. [2020-07-21 23:48:30,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:30,402 INFO L276 IsEmpty]: Start isEmpty. Operand 24695 states and 40136 transitions. [2020-07-21 23:48:30,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-21 23:48:30,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:30,425 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:30,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:30,639 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:30,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:30,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1841843359, now seen corresponding path program 1 times [2020-07-21 23:48:30,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:30,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982561804] [2020-07-21 23:48:30,641 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 [2020-07-21 23:48:30,979 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:30,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:30,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 1658 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:30,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:31,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:31,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:31,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982561804] [2020-07-21 23:48:31,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:31,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:31,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182400701] [2020-07-21 23:48:31,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:31,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:31,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:31,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:31,212 INFO L87 Difference]: Start difference. First operand 24695 states and 40136 transitions. Second operand 3 states. [2020-07-21 23:48:32,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:32,552 INFO L93 Difference]: Finished difference Result 72879 states and 118464 transitions. [2020-07-21 23:48:32,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:32,552 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 486 [2020-07-21 23:48:32,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:32,610 INFO L225 Difference]: With dead ends: 72879 [2020-07-21 23:48:32,610 INFO L226 Difference]: Without dead ends: 48729 [2020-07-21 23:48:32,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:32,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48729 states. [2020-07-21 23:48:33,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48729 to 25095. [2020-07-21 23:48:33,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25095 states. [2020-07-21 23:48:33,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25095 states to 25095 states and 40716 transitions. [2020-07-21 23:48:33,831 INFO L78 Accepts]: Start accepts. Automaton has 25095 states and 40716 transitions. Word has length 486 [2020-07-21 23:48:33,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:33,832 INFO L479 AbstractCegarLoop]: Abstraction has 25095 states and 40716 transitions. [2020-07-21 23:48:33,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:33,832 INFO L276 IsEmpty]: Start isEmpty. Operand 25095 states and 40716 transitions. [2020-07-21 23:48:33,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-21 23:48:33,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:33,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:34,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:34,075 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:34,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:34,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1937559181, now seen corresponding path program 1 times [2020-07-21 23:48:34,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:34,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005484299] [2020-07-21 23:48:34,078 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 [2020-07-21 23:48:34,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:34,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:34,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:34,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:34,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:34,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:34,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005484299] [2020-07-21 23:48:34,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:34,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:34,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512078414] [2020-07-21 23:48:34,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:34,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:34,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:34,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:34,575 INFO L87 Difference]: Start difference. First operand 25095 states and 40716 transitions. Second operand 4 states. [2020-07-21 23:48:36,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:36,049 INFO L93 Difference]: Finished difference Result 60772 states and 99459 transitions. [2020-07-21 23:48:36,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:36,050 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 486 [2020-07-21 23:48:36,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:36,086 INFO L225 Difference]: With dead ends: 60772 [2020-07-21 23:48:36,087 INFO L226 Difference]: Without dead ends: 31208 [2020-07-21 23:48:36,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:36,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31208 states. [2020-07-21 23:48:38,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31208 to 31206. [2020-07-21 23:48:38,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31206 states. [2020-07-21 23:48:38,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31206 states to 31206 states and 50772 transitions. [2020-07-21 23:48:38,469 INFO L78 Accepts]: Start accepts. Automaton has 31206 states and 50772 transitions. Word has length 486 [2020-07-21 23:48:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:38,470 INFO L479 AbstractCegarLoop]: Abstraction has 31206 states and 50772 transitions. [2020-07-21 23:48:38,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:38,470 INFO L276 IsEmpty]: Start isEmpty. Operand 31206 states and 50772 transitions. [2020-07-21 23:48:38,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 23:48:38,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:38,496 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:38,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:38,697 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:38,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:38,698 INFO L82 PathProgramCache]: Analyzing trace with hash -942148744, now seen corresponding path program 1 times [2020-07-21 23:48:38,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:38,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59930346] [2020-07-21 23:48:38,699 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 [2020-07-21 23:48:39,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:39,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:39,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:39,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:39,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:39,167 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:39,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59930346] [2020-07-21 23:48:39,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:39,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:39,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337474338] [2020-07-21 23:48:39,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:39,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:39,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:39,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:39,169 INFO L87 Difference]: Start difference. First operand 31206 states and 50772 transitions. Second operand 3 states. [2020-07-21 23:48:41,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:41,266 INFO L93 Difference]: Finished difference Result 91063 states and 148260 transitions. [2020-07-21 23:48:41,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:41,267 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-21 23:48:41,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:41,338 INFO L225 Difference]: With dead ends: 91063 [2020-07-21 23:48:41,338 INFO L226 Difference]: Without dead ends: 61207 [2020-07-21 23:48:41,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:41,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61207 states. [2020-07-21 23:48:42,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61207 to 32019. [2020-07-21 23:48:42,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32019 states. [2020-07-21 23:48:42,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32019 states to 32019 states and 51814 transitions. [2020-07-21 23:48:42,660 INFO L78 Accepts]: Start accepts. Automaton has 32019 states and 51814 transitions. Word has length 487 [2020-07-21 23:48:42,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:42,660 INFO L479 AbstractCegarLoop]: Abstraction has 32019 states and 51814 transitions. [2020-07-21 23:48:42,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:42,660 INFO L276 IsEmpty]: Start isEmpty. Operand 32019 states and 51814 transitions. [2020-07-21 23:48:42,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 23:48:42,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:42,687 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:42,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:42,888 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:42,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:42,889 INFO L82 PathProgramCache]: Analyzing trace with hash 185562071, now seen corresponding path program 1 times [2020-07-21 23:48:42,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:42,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65572933] [2020-07-21 23:48:42,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:43,254 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:43,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:43,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 1663 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:43,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:43,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:43,578 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:43,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65572933] [2020-07-21 23:48:43,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:43,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:43,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316125126] [2020-07-21 23:48:43,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:43,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:43,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:43,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:43,580 INFO L87 Difference]: Start difference. First operand 32019 states and 51814 transitions. Second operand 3 states. [2020-07-21 23:48:45,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:45,544 INFO L93 Difference]: Finished difference Result 88993 states and 144112 transitions. [2020-07-21 23:48:45,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:48:45,545 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-21 23:48:45,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:45,612 INFO L225 Difference]: With dead ends: 88993 [2020-07-21 23:48:45,613 INFO L226 Difference]: Without dead ends: 57319 [2020-07-21 23:48:45,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:45,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57319 states. [2020-07-21 23:48:47,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57319 to 31487. [2020-07-21 23:48:47,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31487 states. [2020-07-21 23:48:47,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31487 states to 31487 states and 51022 transitions. [2020-07-21 23:48:47,272 INFO L78 Accepts]: Start accepts. Automaton has 31487 states and 51022 transitions. Word has length 487 [2020-07-21 23:48:47,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:47,272 INFO L479 AbstractCegarLoop]: Abstraction has 31487 states and 51022 transitions. [2020-07-21 23:48:47,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:48:47,272 INFO L276 IsEmpty]: Start isEmpty. Operand 31487 states and 51022 transitions. [2020-07-21 23:48:47,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-21 23:48:47,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:47,299 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:47,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:47,501 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:47,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:47,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1590945355, now seen corresponding path program 1 times [2020-07-21 23:48:47,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:47,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030960138] [2020-07-21 23:48:47,503 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 [2020-07-21 23:48:47,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:48:47,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:47,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 2038 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:47,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:48,126 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:48,126 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:48,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030960138] [2020-07-21 23:48:48,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:48,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:48,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252258055] [2020-07-21 23:48:48,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:48,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:48,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:48,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:48,128 INFO L87 Difference]: Start difference. First operand 31487 states and 51022 transitions. Second operand 4 states. [2020-07-21 23:48:49,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:49,641 INFO L93 Difference]: Finished difference Result 42795 states and 69222 transitions. [2020-07-21 23:48:49,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:48:49,641 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 488 [2020-07-21 23:48:49,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:49,671 INFO L225 Difference]: With dead ends: 42795 [2020-07-21 23:48:49,671 INFO L226 Difference]: Without dead ends: 31505 [2020-07-21 23:48:49,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:49,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31505 states. [2020-07-21 23:48:50,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31505 to 25721. [2020-07-21 23:48:50,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25721 states. [2020-07-21 23:48:50,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25721 states to 25721 states and 41195 transitions. [2020-07-21 23:48:50,792 INFO L78 Accepts]: Start accepts. Automaton has 25721 states and 41195 transitions. Word has length 488 [2020-07-21 23:48:50,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:50,792 INFO L479 AbstractCegarLoop]: Abstraction has 25721 states and 41195 transitions. [2020-07-21 23:48:50,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:50,793 INFO L276 IsEmpty]: Start isEmpty. Operand 25721 states and 41195 transitions. [2020-07-21 23:48:50,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-21 23:48:50,813 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:50,813 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:51,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:51,014 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:51,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:51,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1202132142, now seen corresponding path program 1 times [2020-07-21 23:48:51,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:51,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858464979] [2020-07-21 23:48:51,016 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 [2020-07-21 23:48:51,364 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:51,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:51,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 1655 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:48:51,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:51,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:51,500 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:51,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858464979] [2020-07-21 23:48:51,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:51,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:48:51,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214660136] [2020-07-21 23:48:51,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:48:51,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:51,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:48:51,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:48:51,503 INFO L87 Difference]: Start difference. First operand 25721 states and 41195 transitions. Second operand 4 states. [2020-07-21 23:48:53,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:48:53,871 INFO L93 Difference]: Finished difference Result 69305 states and 111126 transitions. [2020-07-21 23:48:53,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:48:53,871 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 488 [2020-07-21 23:48:53,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:48:53,916 INFO L225 Difference]: With dead ends: 69305 [2020-07-21 23:48:53,916 INFO L226 Difference]: Without dead ends: 46615 [2020-07-21 23:48:53,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:48:53,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46615 states. [2020-07-21 23:48:57,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46615 to 46613. [2020-07-21 23:48:57,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46613 states. [2020-07-21 23:48:57,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46613 states to 46613 states and 74277 transitions. [2020-07-21 23:48:57,233 INFO L78 Accepts]: Start accepts. Automaton has 46613 states and 74277 transitions. Word has length 488 [2020-07-21 23:48:57,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:48:57,234 INFO L479 AbstractCegarLoop]: Abstraction has 46613 states and 74277 transitions. [2020-07-21 23:48:57,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:48:57,234 INFO L276 IsEmpty]: Start isEmpty. Operand 46613 states and 74277 transitions. [2020-07-21 23:48:57,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 23:48:57,268 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:48:57,268 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:48:57,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:48:57,469 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:48:57,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:48:57,470 INFO L82 PathProgramCache]: Analyzing trace with hash 360500243, now seen corresponding path program 1 times [2020-07-21 23:48:57,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:48:57,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076546812] [2020-07-21 23:48:57,471 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 [2020-07-21 23:48:57,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:48:57,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:48:57,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:48:57,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:48:57,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:48:57,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:48:57,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076546812] [2020-07-21 23:48:57,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:48:57,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:48:57,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27727625] [2020-07-21 23:48:57,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:48:57,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:48:57,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:48:57,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:48:57,936 INFO L87 Difference]: Start difference. First operand 46613 states and 74277 transitions. Second operand 3 states. [2020-07-21 23:49:02,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:02,193 INFO L93 Difference]: Finished difference Result 133647 states and 213429 transitions. [2020-07-21 23:49:02,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:02,194 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-21 23:49:02,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:02,279 INFO L225 Difference]: With dead ends: 133647 [2020-07-21 23:49:02,279 INFO L226 Difference]: Without dead ends: 90097 [2020-07-21 23:49:02,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:02,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90097 states. [2020-07-21 23:49:06,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90097 to 46918. [2020-07-21 23:49:06,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46918 states. [2020-07-21 23:49:06,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46918 states to 46918 states and 74694 transitions. [2020-07-21 23:49:06,638 INFO L78 Accepts]: Start accepts. Automaton has 46918 states and 74694 transitions. Word has length 489 [2020-07-21 23:49:06,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:06,638 INFO L479 AbstractCegarLoop]: Abstraction has 46918 states and 74694 transitions. [2020-07-21 23:49:06,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:06,639 INFO L276 IsEmpty]: Start isEmpty. Operand 46918 states and 74694 transitions. [2020-07-21 23:49:06,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-21 23:49:06,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:06,687 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:06,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:06,888 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:06,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:06,889 INFO L82 PathProgramCache]: Analyzing trace with hash 546830444, now seen corresponding path program 1 times [2020-07-21 23:49:06,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:06,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2144258767] [2020-07-21 23:49:06,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 23:49:07,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:07,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:07,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 2041 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:07,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:07,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:07,453 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:07,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2144258767] [2020-07-21 23:49:07,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:07,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:07,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746690498] [2020-07-21 23:49:07,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:07,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:07,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:07,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:07,455 INFO L87 Difference]: Start difference. First operand 46918 states and 74694 transitions. Second operand 3 states. [2020-07-21 23:49:10,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:10,180 INFO L93 Difference]: Finished difference Result 75375 states and 120671 transitions. [2020-07-21 23:49:10,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:10,180 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 490 [2020-07-21 23:49:10,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:10,235 INFO L225 Difference]: With dead ends: 75375 [2020-07-21 23:49:10,235 INFO L226 Difference]: Without dead ends: 55469 [2020-07-21 23:49:10,256 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:10,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55469 states. [2020-07-21 23:49:13,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55469 to 55467. [2020-07-21 23:49:13,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55467 states. [2020-07-21 23:49:13,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55467 states to 55467 states and 88920 transitions. [2020-07-21 23:49:13,178 INFO L78 Accepts]: Start accepts. Automaton has 55467 states and 88920 transitions. Word has length 490 [2020-07-21 23:49:13,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:13,179 INFO L479 AbstractCegarLoop]: Abstraction has 55467 states and 88920 transitions. [2020-07-21 23:49:13,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:13,179 INFO L276 IsEmpty]: Start isEmpty. Operand 55467 states and 88920 transitions. [2020-07-21 23:49:13,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-21 23:49:13,219 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:13,220 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:13,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:13,428 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:13,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:13,429 INFO L82 PathProgramCache]: Analyzing trace with hash -2087710967, now seen corresponding path program 1 times [2020-07-21 23:49:13,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:13,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060876951] [2020-07-21 23:49:13,430 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 [2020-07-21 23:49:13,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:13,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:13,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 1656 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:13,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:13,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:13,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:13,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060876951] [2020-07-21 23:49:13,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:13,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:13,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611602494] [2020-07-21 23:49:13,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:13,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:13,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:13,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:13,877 INFO L87 Difference]: Start difference. First operand 55467 states and 88920 transitions. Second operand 4 states. [2020-07-21 23:49:19,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:19,193 INFO L93 Difference]: Finished difference Result 133790 states and 216551 transitions. [2020-07-21 23:49:19,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:19,193 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 490 [2020-07-21 23:49:19,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:19,275 INFO L225 Difference]: With dead ends: 133790 [2020-07-21 23:49:19,276 INFO L226 Difference]: Without dead ends: 71383 [2020-07-21 23:49:19,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:49:19,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71383 states. [2020-07-21 23:49:23,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71383 to 71381. [2020-07-21 23:49:23,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71381 states. [2020-07-21 23:49:23,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71381 states to 71381 states and 115090 transitions. [2020-07-21 23:49:23,208 INFO L78 Accepts]: Start accepts. Automaton has 71381 states and 115090 transitions. Word has length 490 [2020-07-21 23:49:23,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:23,208 INFO L479 AbstractCegarLoop]: Abstraction has 71381 states and 115090 transitions. [2020-07-21 23:49:23,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:23,209 INFO L276 IsEmpty]: Start isEmpty. Operand 71381 states and 115090 transitions. [2020-07-21 23:49:23,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-21 23:49:23,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:23,268 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:23,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:23,480 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:23,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:23,481 INFO L82 PathProgramCache]: Analyzing trace with hash 125097927, now seen corresponding path program 1 times [2020-07-21 23:49:23,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:23,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421908664] [2020-07-21 23:49:23,482 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 [2020-07-21 23:49:23,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:23,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:23,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 1665 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:23,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:23,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:23,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:23,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421908664] [2020-07-21 23:49:23,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:23,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:23,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315993704] [2020-07-21 23:49:23,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:23,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:23,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:23,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:23,924 INFO L87 Difference]: Start difference. First operand 71381 states and 115090 transitions. Second operand 4 states. [2020-07-21 23:49:29,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:29,159 INFO L93 Difference]: Finished difference Result 96200 states and 154628 transitions. [2020-07-21 23:49:29,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:29,160 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 492 [2020-07-21 23:49:29,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:29,227 INFO L225 Difference]: With dead ends: 96200 [2020-07-21 23:49:29,228 INFO L226 Difference]: Without dead ends: 70968 [2020-07-21 23:49:29,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 489 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:49:29,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70968 states. [2020-07-21 23:49:32,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70968 to 58003. [2020-07-21 23:49:32,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58003 states. [2020-07-21 23:49:32,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58003 states to 58003 states and 92371 transitions. [2020-07-21 23:49:32,423 INFO L78 Accepts]: Start accepts. Automaton has 58003 states and 92371 transitions. Word has length 492 [2020-07-21 23:49:32,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:32,423 INFO L479 AbstractCegarLoop]: Abstraction has 58003 states and 92371 transitions. [2020-07-21 23:49:32,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:32,424 INFO L276 IsEmpty]: Start isEmpty. Operand 58003 states and 92371 transitions. [2020-07-21 23:49:32,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2020-07-21 23:49:32,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:32,470 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:32,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:32,671 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:32,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:32,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1654885340, now seen corresponding path program 1 times [2020-07-21 23:49:32,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:32,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564428888] [2020-07-21 23:49:32,673 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:33,064 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:33,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:33,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 2031 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:33,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:33,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:33,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564428888] [2020-07-21 23:49:33,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:33,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:33,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129756194] [2020-07-21 23:49:33,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:33,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:33,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:33,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:33,245 INFO L87 Difference]: Start difference. First operand 58003 states and 92371 transitions. Second operand 3 states. [2020-07-21 23:49:39,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:39,257 INFO L93 Difference]: Finished difference Result 161575 states and 257480 transitions. [2020-07-21 23:49:39,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:39,258 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 492 [2020-07-21 23:49:39,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:39,378 INFO L225 Difference]: With dead ends: 161575 [2020-07-21 23:49:39,378 INFO L226 Difference]: Without dead ends: 110731 [2020-07-21 23:49:39,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:39,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110731 states. [2020-07-21 23:49:47,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110731 to 110729. [2020-07-21 23:49:47,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110729 states. [2020-07-21 23:49:47,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110729 states to 110729 states and 175845 transitions. [2020-07-21 23:49:47,417 INFO L78 Accepts]: Start accepts. Automaton has 110729 states and 175845 transitions. Word has length 492 [2020-07-21 23:49:47,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:47,417 INFO L479 AbstractCegarLoop]: Abstraction has 110729 states and 175845 transitions. [2020-07-21 23:49:47,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:47,417 INFO L276 IsEmpty]: Start isEmpty. Operand 110729 states and 175845 transitions. [2020-07-21 23:49:47,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-21 23:49:47,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:47,514 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:47,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:47,715 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:47,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:47,716 INFO L82 PathProgramCache]: Analyzing trace with hash 579024689, now seen corresponding path program 1 times [2020-07-21 23:49:47,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:47,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660355113] [2020-07-21 23:49:47,717 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:48,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:48,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:48,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 1659 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:48,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:48,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:49:48,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:48,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660355113] [2020-07-21 23:49:48,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:48,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:48,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518438835] [2020-07-21 23:49:48,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:48,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:48,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:48,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:48,149 INFO L87 Difference]: Start difference. First operand 110729 states and 175845 transitions. Second operand 3 states. [2020-07-21 23:50:02,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:02,234 INFO L93 Difference]: Finished difference Result 322372 states and 512792 transitions. [2020-07-21 23:50:02,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:02,234 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 493 [2020-07-21 23:50:02,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:02,501 INFO L225 Difference]: With dead ends: 322372 [2020-07-21 23:50:02,501 INFO L226 Difference]: Without dead ends: 216740 [2020-07-21 23:50:02,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 491 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:02,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216740 states. [2020-07-21 23:50:10,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216740 to 111642. [2020-07-21 23:50:10,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111642 states. [2020-07-21 23:50:10,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111642 states to 111642 states and 176915 transitions. [2020-07-21 23:50:10,309 INFO L78 Accepts]: Start accepts. Automaton has 111642 states and 176915 transitions. Word has length 493 [2020-07-21 23:50:10,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:10,310 INFO L479 AbstractCegarLoop]: Abstraction has 111642 states and 176915 transitions. [2020-07-21 23:50:10,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:10,310 INFO L276 IsEmpty]: Start isEmpty. Operand 111642 states and 176915 transitions. [2020-07-21 23:50:10,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 495 [2020-07-21 23:50:10,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:10,413 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:10,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:10,629 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:10,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:10,630 INFO L82 PathProgramCache]: Analyzing trace with hash -933405289, now seen corresponding path program 1 times [2020-07-21 23:50:10,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:10,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406350353] [2020-07-21 23:50:10,631 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:10,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:50:10,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:10,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 1656 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:50:10,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:11,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:50:11,071 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:11,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406350353] [2020-07-21 23:50:11,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:11,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:50:11,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284622985] [2020-07-21 23:50:11,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:50:11,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:11,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:50:11,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:50:11,073 INFO L87 Difference]: Start difference. First operand 111642 states and 176915 transitions. Second operand 4 states. [2020-07-21 23:50:22,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:22,614 INFO L93 Difference]: Finished difference Result 262688 states and 419829 transitions. [2020-07-21 23:50:22,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:22,615 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 494 [2020-07-21 23:50:22,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:22,773 INFO L225 Difference]: With dead ends: 262688 [2020-07-21 23:50:22,773 INFO L226 Difference]: Without dead ends: 138248 [2020-07-21 23:50:22,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 491 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:50:22,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138248 states. [2020-07-21 23:50:31,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138248 to 138246. [2020-07-21 23:50:31,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138246 states. [2020-07-21 23:50:31,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138246 states to 138246 states and 219752 transitions. [2020-07-21 23:50:31,826 INFO L78 Accepts]: Start accepts. Automaton has 138246 states and 219752 transitions. Word has length 494 [2020-07-21 23:50:31,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:31,827 INFO L479 AbstractCegarLoop]: Abstraction has 138246 states and 219752 transitions. [2020-07-21 23:50:31,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:50:31,827 INFO L276 IsEmpty]: Start isEmpty. Operand 138246 states and 219752 transitions. [2020-07-21 23:50:31,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 23:50:31,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:31,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:32,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:32,157 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:32,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:32,158 INFO L82 PathProgramCache]: Analyzing trace with hash 81369320, now seen corresponding path program 1 times [2020-07-21 23:50:32,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:32,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605038115] [2020-07-21 23:50:32,159 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:32,484 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:50:32,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:32,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 1656 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:50:32,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:32,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:50:32,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:32,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605038115] [2020-07-21 23:50:32,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:32,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:50:32,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639082984] [2020-07-21 23:50:32,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:50:32,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:32,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:50:32,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:50:32,615 INFO L87 Difference]: Start difference. First operand 138246 states and 219752 transitions. Second operand 4 states. [2020-07-21 23:50:45,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:45,698 INFO L93 Difference]: Finished difference Result 216098 states and 342146 transitions. [2020-07-21 23:50:45,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:45,698 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-21 23:50:45,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:45,888 INFO L225 Difference]: With dead ends: 216098 [2020-07-21 23:50:45,888 INFO L226 Difference]: Without dead ends: 180347 [2020-07-21 23:50:45,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:50:46,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180347 states. [2020-07-21 23:50:55,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180347 to 146081. [2020-07-21 23:50:55,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146081 states. [2020-07-21 23:50:55,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146081 states to 146081 states and 233172 transitions. [2020-07-21 23:50:55,964 INFO L78 Accepts]: Start accepts. Automaton has 146081 states and 233172 transitions. Word has length 496 [2020-07-21 23:50:55,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:55,964 INFO L479 AbstractCegarLoop]: Abstraction has 146081 states and 233172 transitions. [2020-07-21 23:50:55,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:50:55,965 INFO L276 IsEmpty]: Start isEmpty. Operand 146081 states and 233172 transitions. [2020-07-21 23:50:56,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 23:50:56,096 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:56,097 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:56,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:56,298 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:56,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:56,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1091697106, now seen corresponding path program 1 times [2020-07-21 23:50:56,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:56,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632145987] [2020-07-21 23:50:56,300 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:56,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:56,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:56,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 2033 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:56,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:56,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:50:56,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:56,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632145987] [2020-07-21 23:50:56,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:56,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:56,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726084662] [2020-07-21 23:50:56,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:56,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:56,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:56,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:56,918 INFO L87 Difference]: Start difference. First operand 146081 states and 233172 transitions. Second operand 3 states. [2020-07-21 23:51:15,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:51:15,955 INFO L93 Difference]: Finished difference Result 404895 states and 645152 transitions. [2020-07-21 23:51:15,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:51:15,955 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-21 23:51:15,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:51:16,556 INFO L225 Difference]: With dead ends: 404895 [2020-07-21 23:51:16,556 INFO L226 Difference]: Without dead ends: 279250 [2020-07-21 23:51:16,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:51:16,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279250 states. [2020-07-21 23:51:39,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279250 to 279248. [2020-07-21 23:51:39,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279248 states. [2020-07-21 23:51:39,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279248 states to 279248 states and 443667 transitions. [2020-07-21 23:51:39,502 INFO L78 Accepts]: Start accepts. Automaton has 279248 states and 443667 transitions. Word has length 496 [2020-07-21 23:51:39,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:51:39,503 INFO L479 AbstractCegarLoop]: Abstraction has 279248 states and 443667 transitions. [2020-07-21 23:51:39,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:51:39,503 INFO L276 IsEmpty]: Start isEmpty. Operand 279248 states and 443667 transitions. [2020-07-21 23:51:39,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 23:51:39,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:51:39,749 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:51:39,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:51:39,950 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:51:39,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:51:39,951 INFO L82 PathProgramCache]: Analyzing trace with hash -282525618, now seen corresponding path program 1 times [2020-07-21 23:51:39,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:51:39,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739728230] [2020-07-21 23:51:39,952 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:51:40,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:51:40,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:51:40,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 1659 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:51:40,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:51:41,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:51:41,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:51:41,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739728230] [2020-07-21 23:51:41,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:51:41,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:51:41,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985567068] [2020-07-21 23:51:41,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:51:41,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:51:41,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:51:41,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:51:41,081 INFO L87 Difference]: Start difference. First operand 279248 states and 443667 transitions. Second operand 3 states. [2020-07-21 23:52:16,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:52:16,733 INFO L93 Difference]: Finished difference Result 714722 states and 1120726 transitions. [2020-07-21 23:52:16,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:52:16,734 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 23:52:16,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:52:17,321 INFO L225 Difference]: With dead ends: 714722 [2020-07-21 23:52:17,321 INFO L226 Difference]: Without dead ends: 496280 [2020-07-21 23:52:17,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:52:17,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496280 states. [2020-07-21 23:52:44,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496280 to 285056. [2020-07-21 23:52:44,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 285056 states. [2020-07-21 23:52:45,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285056 states to 285056 states and 451947 transitions. [2020-07-21 23:52:45,218 INFO L78 Accepts]: Start accepts. Automaton has 285056 states and 451947 transitions. Word has length 499 [2020-07-21 23:52:45,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:52:45,219 INFO L479 AbstractCegarLoop]: Abstraction has 285056 states and 451947 transitions. [2020-07-21 23:52:45,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:52:45,219 INFO L276 IsEmpty]: Start isEmpty. Operand 285056 states and 451947 transitions. [2020-07-21 23:52:45,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 23:52:45,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:52:45,467 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:52:45,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:52:45,668 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:52:45,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:52:45,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1161470678, now seen corresponding path program 1 times [2020-07-21 23:52:45,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:52:45,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278604012] [2020-07-21 23:52:45,670 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:52:46,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:52:46,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:52:46,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 1666 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:52:46,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:52:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:52:46,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:52:46,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278604012] [2020-07-21 23:52:46,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:52:46,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:52:46,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867016717] [2020-07-21 23:52:46,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:52:46,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:52:46,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:52:46,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:52:46,116 INFO L87 Difference]: Start difference. First operand 285056 states and 451947 transitions. Second operand 4 states. [2020-07-21 23:53:16,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:53:16,040 INFO L93 Difference]: Finished difference Result 519445 states and 823174 transitions. [2020-07-21 23:53:16,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:53:16,041 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 500 [2020-07-21 23:53:16,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:53:16,485 INFO L225 Difference]: With dead ends: 519445 [2020-07-21 23:53:16,486 INFO L226 Difference]: Without dead ends: 390985 [2020-07-21 23:53:16,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:53:16,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390985 states. [2020-07-21 23:53:43,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390985 to 292997. [2020-07-21 23:53:43,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292997 states. [2020-07-21 23:53:44,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292997 states to 292997 states and 464612 transitions. [2020-07-21 23:53:44,372 INFO L78 Accepts]: Start accepts. Automaton has 292997 states and 464612 transitions. Word has length 500 [2020-07-21 23:53:44,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:53:44,373 INFO L479 AbstractCegarLoop]: Abstraction has 292997 states and 464612 transitions. [2020-07-21 23:53:44,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:53:44,373 INFO L276 IsEmpty]: Start isEmpty. Operand 292997 states and 464612 transitions. [2020-07-21 23:53:44,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 23:53:44,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:53:44,670 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:53:44,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:53:44,878 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:53:44,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:53:44,879 INFO L82 PathProgramCache]: Analyzing trace with hash -2030356772, now seen corresponding path program 1 times [2020-07-21 23:53:44,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:53:44,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631896250] [2020-07-21 23:53:44,880 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:53:45,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:53:45,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:53:45,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 1664 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:53:45,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:53:45,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:53:45,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:53:45,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631896250] [2020-07-21 23:53:45,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:53:45,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:53:45,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772207557] [2020-07-21 23:53:45,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:53:45,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:53:45,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:53:45,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:53:45,327 INFO L87 Difference]: Start difference. First operand 292997 states and 464612 transitions. Second operand 4 states. [2020-07-21 23:54:10,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:54:10,694 INFO L93 Difference]: Finished difference Result 385375 states and 609626 transitions. [2020-07-21 23:54:10,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:54:10,695 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-21 23:54:10,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:54:11,011 INFO L225 Difference]: With dead ends: 385375 [2020-07-21 23:54:11,012 INFO L226 Difference]: Without dead ends: 293207 [2020-07-21 23:54:11,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:54:11,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293207 states. [2020-07-21 23:54:31,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293207 to 245070. [2020-07-21 23:54:31,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245070 states. [2020-07-21 23:54:31,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245070 states to 245070 states and 385509 transitions. [2020-07-21 23:54:31,669 INFO L78 Accepts]: Start accepts. Automaton has 245070 states and 385509 transitions. Word has length 501 [2020-07-21 23:54:31,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:54:31,669 INFO L479 AbstractCegarLoop]: Abstraction has 245070 states and 385509 transitions. [2020-07-21 23:54:31,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:54:31,669 INFO L276 IsEmpty]: Start isEmpty. Operand 245070 states and 385509 transitions. [2020-07-21 23:54:31,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 23:54:31,896 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:54:31,896 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:54:32,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:54:32,097 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:54:32,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:54:32,098 INFO L82 PathProgramCache]: Analyzing trace with hash 477038301, now seen corresponding path program 1 times [2020-07-21 23:54:32,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:54:32,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260828286] [2020-07-21 23:54:32,099 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:54:32,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:54:32,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:54:32,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 2053 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:54:32,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:54:32,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:54:32,691 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:54:32,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260828286] [2020-07-21 23:54:32,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:54:32,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:54:32,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009408594] [2020-07-21 23:54:32,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:54:32,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:54:32,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:54:32,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:54:32,693 INFO L87 Difference]: Start difference. First operand 245070 states and 385509 transitions. Second operand 4 states. [2020-07-21 23:55:13,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:55:13,895 INFO L93 Difference]: Finished difference Result 720588 states and 1133841 transitions. [2020-07-21 23:55:13,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:55:13,896 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 504 [2020-07-21 23:55:13,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:55:14,497 INFO L225 Difference]: With dead ends: 720588 [2020-07-21 23:55:14,497 INFO L226 Difference]: Without dead ends: 476672 [2020-07-21 23:55:14,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:55:15,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476672 states. [2020-07-21 23:55:59,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476672 to 475784. [2020-07-21 23:55:59,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 475784 states. [2020-07-21 23:56:00,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475784 states to 475784 states and 745280 transitions. [2020-07-21 23:56:00,605 INFO L78 Accepts]: Start accepts. Automaton has 475784 states and 745280 transitions. Word has length 504 [2020-07-21 23:56:00,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:56:00,605 INFO L479 AbstractCegarLoop]: Abstraction has 475784 states and 745280 transitions. [2020-07-21 23:56:00,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:56:00,605 INFO L276 IsEmpty]: Start isEmpty. Operand 475784 states and 745280 transitions. [2020-07-21 23:56:01,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 23:56:01,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:56:01,115 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:56:01,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:56:01,316 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:56:01,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:56:01,316 INFO L82 PathProgramCache]: Analyzing trace with hash 281457076, now seen corresponding path program 1 times [2020-07-21 23:56:01,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:56:01,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [158251725] [2020-07-21 23:56:01,317 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:56:01,657 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:56:01,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:56:01,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 1664 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:56:01,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:56:01,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:56:01,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:56:01,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [158251725] [2020-07-21 23:56:01,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:56:01,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:56:01,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506448851] [2020-07-21 23:56:01,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:56:01,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:56:01,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:56:01,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:56:01,788 INFO L87 Difference]: Start difference. First operand 475784 states and 745280 transitions. Second operand 4 states. [2020-07-21 23:57:08,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:08,260 INFO L93 Difference]: Finished difference Result 1073645 states and 1678119 transitions. [2020-07-21 23:57:08,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:57:08,261 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-21 23:57:08,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:09,292 INFO L225 Difference]: With dead ends: 1073645 [2020-07-21 23:57:09,293 INFO L226 Difference]: Without dead ends: 763722 [2020-07-21 23:57:09,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:57:10,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 763722 states. [2020-07-21 23:58:06,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 763722 to 511130. [2020-07-21 23:58:06,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 511130 states. [2020-07-21 23:58:07,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511130 states to 511130 states and 801160 transitions. [2020-07-21 23:58:07,201 INFO L78 Accepts]: Start accepts. Automaton has 511130 states and 801160 transitions. Word has length 505 [2020-07-21 23:58:07,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:58:07,201 INFO L479 AbstractCegarLoop]: Abstraction has 511130 states and 801160 transitions. [2020-07-21 23:58:07,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:58:07,201 INFO L276 IsEmpty]: Start isEmpty. Operand 511130 states and 801160 transitions. [2020-07-21 23:58:07,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 23:58:07,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:58:07,798 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:58:07,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:07,999 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:58:08,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:58:08,000 INFO L82 PathProgramCache]: Analyzing trace with hash -939467826, now seen corresponding path program 1 times [2020-07-21 23:58:08,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:58:08,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186069781] [2020-07-21 23:58:08,001 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:08,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:58:08,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:08,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 2056 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:58:08,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:08,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:58:08,601 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:08,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186069781] [2020-07-21 23:58:08,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:08,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:58:08,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352920047] [2020-07-21 23:58:08,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:58:08,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:08,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:58:08,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:08,602 INFO L87 Difference]: Start difference. First operand 511130 states and 801160 transitions. Second operand 3 states. [2020-07-21 23:59:36,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:36,169 INFO L93 Difference]: Finished difference Result 1406781 states and 2204951 transitions. [2020-07-21 23:59:36,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:36,169 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-21 23:59:36,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:38,137 INFO L225 Difference]: With dead ends: 1406781 [2020-07-21 23:59:38,137 INFO L226 Difference]: Without dead ends: 976131 [2020-07-21 23:59:38,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:39,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 976131 states.