/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_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:49:33,664 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:49:33,667 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:49:33,685 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:49:33,686 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:49:33,688 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:49:33,689 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:49:33,700 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:49:33,704 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:49:33,707 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:49:33,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:49:33,710 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:49:33,710 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:49:33,712 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:49:33,714 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:49:33,715 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:49:33,716 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:49:33,717 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:49:33,718 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:49:33,722 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:49:33,727 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:49:33,730 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:49:33,731 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:49:33,731 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:49:33,734 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:49:33,743 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:49:33,744 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:49:33,745 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:49:33,746 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 23:49:33,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:49:33,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:49:33,780 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:49:33,781 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:49:33,781 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:49:33,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:49:33,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:49:33,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:49:33,785 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:49:33,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:49:33,785 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:49:33,785 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:49:33,785 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:49:33,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:49:33,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:49:33,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:49:33,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:49:33,786 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:49:33,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:49:33,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:49:33,787 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:49:33,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:33,793 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:49:33,793 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:49:33,793 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 23:49:34,054 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:49:34,069 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:49:34,074 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:49:34,076 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:49:34,076 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:49:34,077 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:49:34,162 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/68fe3a5ea/8ded186b973346938153e75903d8d5bc/FLAG518ab92db [2020-07-21 23:49:34,759 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:49:34,760 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:49:34,775 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/68fe3a5ea/8ded186b973346938153e75903d8d5bc/FLAG518ab92db [2020-07-21 23:49:34,935 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/68fe3a5ea/8ded186b973346938153e75903d8d5bc [2020-07-21 23:49:34,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:49:34,947 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:49:34,948 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:49:34,948 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:49:34,952 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:49:34,953 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:49:34" (1/1) ... [2020-07-21 23:49:34,955 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e161a06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:34, skipping insertion in model container [2020-07-21 23:49:34,956 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:49:34" (1/1) ... [2020-07-21 23:49:34,962 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:49:35,064 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:49:36,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:49:36,183 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:49:36,635 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:49:36,676 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:49:36,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36 WrapperNode [2020-07-21 23:49:36,677 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:49:36,677 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:49:36,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:49:36,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:49:36,697 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,700 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,755 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,755 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,844 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,876 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,887 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (1/1) ... [2020-07-21 23:49:36,906 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:49:36,907 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:49:36,907 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:49:36,907 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:49:36,908 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (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 23:49:36,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:49:36,988 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:49:36,988 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:49:36,988 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:49:36,989 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:49:36,989 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 23:49:36,989 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 23:49:36,989 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:49:36,989 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 23:49:36,990 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:49:36,990 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:49:36,990 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 23:49:36,990 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 23:49:36,990 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 23:49:36,991 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 23:49:36,991 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 23:49:36,991 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 23:49:36,991 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 23:49:36,991 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 23:49:36,992 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:49:36,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:49:36,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:49:39,276 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:49:39,277 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 23:49:39,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:49:39 BoogieIcfgContainer [2020-07-21 23:49:39,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:49:39,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:49:39,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:49:39,298 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:49:39,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:49:34" (1/3) ... [2020-07-21 23:49:39,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a8886c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:49:39, skipping insertion in model container [2020-07-21 23:49:39,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:49:36" (2/3) ... [2020-07-21 23:49:39,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a8886c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:49:39, skipping insertion in model container [2020-07-21 23:49:39,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:49:39" (3/3) ... [2020-07-21 23:49:39,306 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-21 23:49:39,317 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:49:39,331 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:49:39,345 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:49:39,373 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:49:39,373 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:49:39,374 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:49:39,374 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:49:39,374 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:49:39,374 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:49:39,374 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:49:39,374 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:49:39,405 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states. [2020-07-21 23:49:39,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2020-07-21 23:49:39,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:39,437 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] [2020-07-21 23:49:39,437 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:39,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:39,443 INFO L82 PathProgramCache]: Analyzing trace with hash 578636414, now seen corresponding path program 1 times [2020-07-21 23:49:39,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:39,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504926484] [2020-07-21 23:49:39,452 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 23:49:39,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:39,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:39,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:39,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:40,298 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 23:49:40,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:40,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504926484] [2020-07-21 23:49:40,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:40,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:40,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512748590] [2020-07-21 23:49:40,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:40,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:40,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:40,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:40,324 INFO L87 Difference]: Start difference. First operand 796 states. Second operand 4 states. [2020-07-21 23:49:40,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:40,589 INFO L93 Difference]: Finished difference Result 2337 states and 4143 transitions. [2020-07-21 23:49:40,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:49:40,591 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 318 [2020-07-21 23:49:40,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:40,627 INFO L225 Difference]: With dead ends: 2337 [2020-07-21 23:49:40,627 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 23:49:40,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 315 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 23:49:40,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 23:49:40,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-21 23:49:40,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 23:49:40,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2409 transitions. [2020-07-21 23:49:40,798 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2409 transitions. Word has length 318 [2020-07-21 23:49:40,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:40,799 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2409 transitions. [2020-07-21 23:49:40,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:40,799 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2409 transitions. [2020-07-21 23:49:40,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-21 23:49:40,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:40,809 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] [2020-07-21 23:49:41,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:41,025 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:41,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:41,027 INFO L82 PathProgramCache]: Analyzing trace with hash 1737976142, now seen corresponding path program 1 times [2020-07-21 23:49:41,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:41,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464120183] [2020-07-21 23:49:41,028 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 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 23:49:41,374 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:41,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:41,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:41,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:41,514 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 23:49:41,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:41,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464120183] [2020-07-21 23:49:41,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:41,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:41,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236581112] [2020-07-21 23:49:41,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:41,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:41,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:41,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:41,519 INFO L87 Difference]: Start difference. First operand 1544 states and 2409 transitions. Second operand 3 states. [2020-07-21 23:49:41,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:41,687 INFO L93 Difference]: Finished difference Result 4418 states and 6858 transitions. [2020-07-21 23:49:41,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:41,688 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 320 [2020-07-21 23:49:41,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:41,705 INFO L225 Difference]: With dead ends: 4418 [2020-07-21 23:49:41,705 INFO L226 Difference]: Without dead ends: 3014 [2020-07-21 23:49:41,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 318 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 23:49:41,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3014 states. [2020-07-21 23:49:41,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3014 to 3012. [2020-07-21 23:49:41,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3012 states. [2020-07-21 23:49:41,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3012 states to 3012 states and 4674 transitions. [2020-07-21 23:49:41,876 INFO L78 Accepts]: Start accepts. Automaton has 3012 states and 4674 transitions. Word has length 320 [2020-07-21 23:49:41,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:41,877 INFO L479 AbstractCegarLoop]: Abstraction has 3012 states and 4674 transitions. [2020-07-21 23:49:41,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:41,878 INFO L276 IsEmpty]: Start isEmpty. Operand 3012 states and 4674 transitions. [2020-07-21 23:49:41,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-21 23:49:41,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:41,888 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] [2020-07-21 23:49:42,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:42,105 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:42,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:42,106 INFO L82 PathProgramCache]: Analyzing trace with hash -943715885, now seen corresponding path program 1 times [2020-07-21 23:49:42,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:42,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026308531] [2020-07-21 23:49:42,108 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 23:49:42,341 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:42,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:42,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:42,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:42,474 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 23:49:42,474 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:42,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026308531] [2020-07-21 23:49:42,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:42,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:42,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871662495] [2020-07-21 23:49:42,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:42,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:42,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:42,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:42,477 INFO L87 Difference]: Start difference. First operand 3012 states and 4674 transitions. Second operand 3 states. [2020-07-21 23:49:42,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:42,659 INFO L93 Difference]: Finished difference Result 8877 states and 13746 transitions. [2020-07-21 23:49:42,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:42,660 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 320 [2020-07-21 23:49:42,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:42,688 INFO L225 Difference]: With dead ends: 8877 [2020-07-21 23:49:42,689 INFO L226 Difference]: Without dead ends: 5892 [2020-07-21 23:49:42,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 318 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 23:49:42,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5892 states. [2020-07-21 23:49:42,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5892 to 3023. [2020-07-21 23:49:42,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3023 states. [2020-07-21 23:49:42,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3023 states to 3023 states and 4689 transitions. [2020-07-21 23:49:42,855 INFO L78 Accepts]: Start accepts. Automaton has 3023 states and 4689 transitions. Word has length 320 [2020-07-21 23:49:42,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:42,855 INFO L479 AbstractCegarLoop]: Abstraction has 3023 states and 4689 transitions. [2020-07-21 23:49:42,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:42,855 INFO L276 IsEmpty]: Start isEmpty. Operand 3023 states and 4689 transitions. [2020-07-21 23:49:42,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2020-07-21 23:49:42,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:42,865 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] [2020-07-21 23:49:43,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:43,079 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:43,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:43,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1234625421, now seen corresponding path program 1 times [2020-07-21 23:49:43,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:43,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889249299] [2020-07-21 23:49:43,080 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 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 23:49:43,316 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:43,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:43,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 1174 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:43,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:43,442 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 23:49:43,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:43,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889249299] [2020-07-21 23:49:43,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:43,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:43,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813677720] [2020-07-21 23:49:43,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:43,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:43,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:43,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:43,444 INFO L87 Difference]: Start difference. First operand 3023 states and 4689 transitions. Second operand 3 states. [2020-07-21 23:49:43,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:43,672 INFO L93 Difference]: Finished difference Result 8974 states and 13913 transitions. [2020-07-21 23:49:43,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:43,673 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 321 [2020-07-21 23:49:43,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:43,702 INFO L225 Difference]: With dead ends: 8974 [2020-07-21 23:49:43,702 INFO L226 Difference]: Without dead ends: 6001 [2020-07-21 23:49:43,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 319 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 23:49:43,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6001 states. [2020-07-21 23:49:43,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6001 to 3039. [2020-07-21 23:49:43,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3039 states. [2020-07-21 23:49:43,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3039 states to 3039 states and 4708 transitions. [2020-07-21 23:49:43,857 INFO L78 Accepts]: Start accepts. Automaton has 3039 states and 4708 transitions. Word has length 321 [2020-07-21 23:49:43,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:43,858 INFO L479 AbstractCegarLoop]: Abstraction has 3039 states and 4708 transitions. [2020-07-21 23:49:43,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:43,858 INFO L276 IsEmpty]: Start isEmpty. Operand 3039 states and 4708 transitions. [2020-07-21 23:49:43,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-21 23:49:43,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:43,868 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] [2020-07-21 23:49:44,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:44,083 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:44,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:44,084 INFO L82 PathProgramCache]: Analyzing trace with hash -59269047, now seen corresponding path program 1 times [2020-07-21 23:49:44,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:44,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960865569] [2020-07-21 23:49:44,086 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 23:49:44,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:44,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:44,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 1172 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:44,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:44,431 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 23:49:44,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:44,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960865569] [2020-07-21 23:49:44,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:44,432 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:44,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467476558] [2020-07-21 23:49:44,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:44,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:44,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:44,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:44,434 INFO L87 Difference]: Start difference. First operand 3039 states and 4708 transitions. Second operand 4 states. [2020-07-21 23:49:44,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:44,665 INFO L93 Difference]: Finished difference Result 6716 states and 10439 transitions. [2020-07-21 23:49:44,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:44,666 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 322 [2020-07-21 23:49:44,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:44,682 INFO L225 Difference]: With dead ends: 6716 [2020-07-21 23:49:44,683 INFO L226 Difference]: Without dead ends: 3403 [2020-07-21 23:49:44,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 319 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 23:49:44,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3403 states. [2020-07-21 23:49:44,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3403 to 3401. [2020-07-21 23:49:44,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3401 states. [2020-07-21 23:49:44,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3401 states to 3401 states and 5257 transitions. [2020-07-21 23:49:44,822 INFO L78 Accepts]: Start accepts. Automaton has 3401 states and 5257 transitions. Word has length 322 [2020-07-21 23:49:44,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:44,822 INFO L479 AbstractCegarLoop]: Abstraction has 3401 states and 5257 transitions. [2020-07-21 23:49:44,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:44,822 INFO L276 IsEmpty]: Start isEmpty. Operand 3401 states and 5257 transitions. [2020-07-21 23:49:44,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 23:49:44,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:44,833 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] [2020-07-21 23:49:45,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:45,048 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:45,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:45,049 INFO L82 PathProgramCache]: Analyzing trace with hash -101962593, now seen corresponding path program 1 times [2020-07-21 23:49:45,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:45,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350029992] [2020-07-21 23:49:45,051 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 23:49:45,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:45,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:45,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 1494 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:45,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:45,513 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 23:49:45,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:45,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350029992] [2020-07-21 23:49:45,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:45,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:45,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055499543] [2020-07-21 23:49:45,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:45,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:45,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:45,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:45,516 INFO L87 Difference]: Start difference. First operand 3401 states and 5257 transitions. Second operand 3 states. [2020-07-21 23:49:45,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:45,801 INFO L93 Difference]: Finished difference Result 9848 states and 15188 transitions. [2020-07-21 23:49:45,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:45,801 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 324 [2020-07-21 23:49:45,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:45,833 INFO L225 Difference]: With dead ends: 9848 [2020-07-21 23:49:45,833 INFO L226 Difference]: Without dead ends: 6675 [2020-07-21 23:49:45,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 322 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 23:49:45,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6675 states. [2020-07-21 23:49:46,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6675 to 6673. [2020-07-21 23:49:46,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6673 states. [2020-07-21 23:49:46,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6673 states to 6673 states and 10260 transitions. [2020-07-21 23:49:46,116 INFO L78 Accepts]: Start accepts. Automaton has 6673 states and 10260 transitions. Word has length 324 [2020-07-21 23:49:46,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:46,117 INFO L479 AbstractCegarLoop]: Abstraction has 6673 states and 10260 transitions. [2020-07-21 23:49:46,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:46,117 INFO L276 IsEmpty]: Start isEmpty. Operand 6673 states and 10260 transitions. [2020-07-21 23:49:46,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 23:49:46,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:46,133 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] [2020-07-21 23:49:46,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:46,348 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:46,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:46,348 INFO L82 PathProgramCache]: Analyzing trace with hash 205468386, now seen corresponding path program 1 times [2020-07-21 23:49:46,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:46,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231513250] [2020-07-21 23:49:46,349 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 23:49:46,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:46,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:46,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:49:46,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:46,725 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 23:49:46,726 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:46,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231513250] [2020-07-21 23:49:46,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:46,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:46,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417844065] [2020-07-21 23:49:46,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:46,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:46,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:46,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:46,728 INFO L87 Difference]: Start difference. First operand 6673 states and 10260 transitions. Second operand 4 states. [2020-07-21 23:49:47,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:47,160 INFO L93 Difference]: Finished difference Result 18787 states and 28697 transitions. [2020-07-21 23:49:47,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:47,161 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 324 [2020-07-21 23:49:47,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:47,197 INFO L225 Difference]: With dead ends: 18787 [2020-07-21 23:49:47,197 INFO L226 Difference]: Without dead ends: 12899 [2020-07-21 23:49:47,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 321 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 23:49:47,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12899 states. [2020-07-21 23:49:47,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12899 to 7248. [2020-07-21 23:49:47,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7248 states. [2020-07-21 23:49:47,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7248 states to 7248 states and 11229 transitions. [2020-07-21 23:49:47,656 INFO L78 Accepts]: Start accepts. Automaton has 7248 states and 11229 transitions. Word has length 324 [2020-07-21 23:49:47,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:47,656 INFO L479 AbstractCegarLoop]: Abstraction has 7248 states and 11229 transitions. [2020-07-21 23:49:47,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:47,657 INFO L276 IsEmpty]: Start isEmpty. Operand 7248 states and 11229 transitions. [2020-07-21 23:49:47,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 23:49:47,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:47,672 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] [2020-07-21 23:49:47,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:47,887 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:47,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:47,887 INFO L82 PathProgramCache]: Analyzing trace with hash 648081066, now seen corresponding path program 1 times [2020-07-21 23:49:47,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:47,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209401686] [2020-07-21 23:49:47,889 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 23:49:48,169 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:48,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:48,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 1498 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 23:49:48,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:48,381 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 23:49:48,382 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:48,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209401686] [2020-07-21 23:49:48,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:48,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 23:49:48,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677122241] [2020-07-21 23:49:48,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 23:49:48,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:48,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 23:49:48,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:49:48,384 INFO L87 Difference]: Start difference. First operand 7248 states and 11229 transitions. Second operand 8 states. [2020-07-21 23:49:50,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:50,440 INFO L93 Difference]: Finished difference Result 16034 states and 24685 transitions. [2020-07-21 23:49:50,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:49:50,440 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 324 [2020-07-21 23:49:50,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:50,465 INFO L225 Difference]: With dead ends: 16034 [2020-07-21 23:49:50,466 INFO L226 Difference]: Without dead ends: 11824 [2020-07-21 23:49:50,476 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 23:49:50,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11824 states. [2020-07-21 23:49:51,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11824 to 9438. [2020-07-21 23:49:51,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9438 states. [2020-07-21 23:49:51,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9438 states to 9438 states and 14451 transitions. [2020-07-21 23:49:51,030 INFO L78 Accepts]: Start accepts. Automaton has 9438 states and 14451 transitions. Word has length 324 [2020-07-21 23:49:51,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:51,031 INFO L479 AbstractCegarLoop]: Abstraction has 9438 states and 14451 transitions. [2020-07-21 23:49:51,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 23:49:51,031 INFO L276 IsEmpty]: Start isEmpty. Operand 9438 states and 14451 transitions. [2020-07-21 23:49:51,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 23:49:51,047 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:51,048 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] [2020-07-21 23:49:51,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:51,261 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:51,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:51,261 INFO L82 PathProgramCache]: Analyzing trace with hash -568038990, now seen corresponding path program 1 times [2020-07-21 23:49:51,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:51,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1158938009] [2020-07-21 23:49:51,262 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 23:49:51,532 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:49:51,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:51,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 1494 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:51,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:51,599 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 23:49:51,599 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:51,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1158938009] [2020-07-21 23:49:51,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:51,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:51,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059502216] [2020-07-21 23:49:51,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:51,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:51,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:51,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:51,601 INFO L87 Difference]: Start difference. First operand 9438 states and 14451 transitions. Second operand 3 states. [2020-07-21 23:49:52,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:52,560 INFO L93 Difference]: Finished difference Result 18244 states and 27777 transitions. [2020-07-21 23:49:52,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:52,561 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 324 [2020-07-21 23:49:52,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:52,584 INFO L225 Difference]: With dead ends: 18244 [2020-07-21 23:49:52,585 INFO L226 Difference]: Without dead ends: 11486 [2020-07-21 23:49:52,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 322 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 23:49:52,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11486 states. [2020-07-21 23:49:53,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11486 to 10132. [2020-07-21 23:49:53,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10132 states. [2020-07-21 23:49:53,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10132 states to 10132 states and 15593 transitions. [2020-07-21 23:49:53,077 INFO L78 Accepts]: Start accepts. Automaton has 10132 states and 15593 transitions. Word has length 324 [2020-07-21 23:49:53,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:53,077 INFO L479 AbstractCegarLoop]: Abstraction has 10132 states and 15593 transitions. [2020-07-21 23:49:53,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:53,078 INFO L276 IsEmpty]: Start isEmpty. Operand 10132 states and 15593 transitions. [2020-07-21 23:49:53,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-21 23:49:53,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:53,092 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] [2020-07-21 23:49:53,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:53,305 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:53,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:53,306 INFO L82 PathProgramCache]: Analyzing trace with hash 728805205, now seen corresponding path program 1 times [2020-07-21 23:49:53,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:53,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733193185] [2020-07-21 23:49:53,308 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 23:49:53,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:53,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:53,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:53,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:53,603 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 23:49:53,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:53,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733193185] [2020-07-21 23:49:53,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:53,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:53,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748634210] [2020-07-21 23:49:53,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:53,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:53,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:53,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:53,606 INFO L87 Difference]: Start difference. First operand 10132 states and 15593 transitions. Second operand 3 states. [2020-07-21 23:49:54,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:54,320 INFO L93 Difference]: Finished difference Result 29825 states and 45855 transitions. [2020-07-21 23:49:54,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:54,321 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 324 [2020-07-21 23:49:54,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:54,356 INFO L225 Difference]: With dead ends: 29825 [2020-07-21 23:49:54,356 INFO L226 Difference]: Without dead ends: 20009 [2020-07-21 23:49:54,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 322 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 23:49:54,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20009 states. [2020-07-21 23:49:54,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20009 to 10229. [2020-07-21 23:49:54,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10229 states. [2020-07-21 23:49:54,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10229 states to 10229 states and 15718 transitions. [2020-07-21 23:49:54,992 INFO L78 Accepts]: Start accepts. Automaton has 10229 states and 15718 transitions. Word has length 324 [2020-07-21 23:49:54,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:54,992 INFO L479 AbstractCegarLoop]: Abstraction has 10229 states and 15718 transitions. [2020-07-21 23:49:54,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:54,992 INFO L276 IsEmpty]: Start isEmpty. Operand 10229 states and 15718 transitions. [2020-07-21 23:49:55,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 23:49:55,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:55,005 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] [2020-07-21 23:49:55,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:55,213 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:55,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:55,214 INFO L82 PathProgramCache]: Analyzing trace with hash 966367979, now seen corresponding path program 1 times [2020-07-21 23:49:55,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:55,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862909137] [2020-07-21 23:49:55,216 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 23:49:55,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:55,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:55,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 1174 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:55,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:55,528 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 23:49:55,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:55,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862909137] [2020-07-21 23:49:55,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:55,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:55,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091575294] [2020-07-21 23:49:55,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:55,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:55,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:55,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:55,531 INFO L87 Difference]: Start difference. First operand 10229 states and 15718 transitions. Second operand 3 states. [2020-07-21 23:49:56,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:56,345 INFO L93 Difference]: Finished difference Result 29882 states and 45903 transitions. [2020-07-21 23:49:56,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:49:56,345 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 325 [2020-07-21 23:49:56,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:56,372 INFO L225 Difference]: With dead ends: 29882 [2020-07-21 23:49:56,372 INFO L226 Difference]: Without dead ends: 20082 [2020-07-21 23:49:56,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 323 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 23:49:56,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20082 states. [2020-07-21 23:49:56,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20082 to 10330. [2020-07-21 23:49:56,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10330 states. [2020-07-21 23:49:56,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10330 states to 10330 states and 15833 transitions. [2020-07-21 23:49:56,826 INFO L78 Accepts]: Start accepts. Automaton has 10330 states and 15833 transitions. Word has length 325 [2020-07-21 23:49:56,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:56,827 INFO L479 AbstractCegarLoop]: Abstraction has 10330 states and 15833 transitions. [2020-07-21 23:49:56,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:49:56,827 INFO L276 IsEmpty]: Start isEmpty. Operand 10330 states and 15833 transitions. [2020-07-21 23:49:56,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 23:49:56,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:56,837 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:57,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:57,038 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:57,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:57,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1708123985, now seen corresponding path program 1 times [2020-07-21 23:49:57,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:57,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655354870] [2020-07-21 23:49:57,040 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 23:49:57,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:57,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:57,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 1174 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:49:57,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:57,349 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 23:49:57,349 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:57,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655354870] [2020-07-21 23:49:57,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:57,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:49:57,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038550658] [2020-07-21 23:49:57,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:49:57,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:57,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:49:57,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:49:57,352 INFO L87 Difference]: Start difference. First operand 10330 states and 15833 transitions. Second operand 4 states. [2020-07-21 23:49:58,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:49:58,136 INFO L93 Difference]: Finished difference Result 22321 states and 34141 transitions. [2020-07-21 23:49:58,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:49:58,136 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-07-21 23:49:58,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:49:58,157 INFO L225 Difference]: With dead ends: 22321 [2020-07-21 23:49:58,157 INFO L226 Difference]: Without dead ends: 11769 [2020-07-21 23:49:58,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:49:58,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11769 states. [2020-07-21 23:49:58,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11769 to 11767. [2020-07-21 23:49:58,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11767 states. [2020-07-21 23:49:58,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11767 states to 11767 states and 17894 transitions. [2020-07-21 23:49:58,662 INFO L78 Accepts]: Start accepts. Automaton has 11767 states and 17894 transitions. Word has length 326 [2020-07-21 23:49:58,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:49:58,662 INFO L479 AbstractCegarLoop]: Abstraction has 11767 states and 17894 transitions. [2020-07-21 23:49:58,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:49:58,662 INFO L276 IsEmpty]: Start isEmpty. Operand 11767 states and 17894 transitions. [2020-07-21 23:49:58,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 23:49:58,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:49:58,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:49:58,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:49:58,889 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:49:58,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:49:58,890 INFO L82 PathProgramCache]: Analyzing trace with hash 936022759, now seen corresponding path program 1 times [2020-07-21 23:49:58,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:49:58,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296492167] [2020-07-21 23:49:58,891 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 23:49:59,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:49:59,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:49:59,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1176 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:49:59,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:49:59,182 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 23:49:59,182 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:49:59,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296492167] [2020-07-21 23:49:59,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:49:59,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:49:59,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802074456] [2020-07-21 23:49:59,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:49:59,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:49:59,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:49:59,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:49:59,184 INFO L87 Difference]: Start difference. First operand 11767 states and 17894 transitions. Second operand 3 states. [2020-07-21 23:50:00,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:00,085 INFO L93 Difference]: Finished difference Result 32269 states and 48896 transitions. [2020-07-21 23:50:00,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:00,086 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 23:50:00,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:00,105 INFO L225 Difference]: With dead ends: 32269 [2020-07-21 23:50:00,105 INFO L226 Difference]: Without dead ends: 20902 [2020-07-21 23:50:00,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 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 23:50:00,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20902 states. [2020-07-21 23:50:00,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20902 to 11337. [2020-07-21 23:50:00,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11337 states. [2020-07-21 23:50:00,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11337 states to 11337 states and 17216 transitions. [2020-07-21 23:50:00,633 INFO L78 Accepts]: Start accepts. Automaton has 11337 states and 17216 transitions. Word has length 326 [2020-07-21 23:50:00,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:00,634 INFO L479 AbstractCegarLoop]: Abstraction has 11337 states and 17216 transitions. [2020-07-21 23:50:00,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:00,634 INFO L276 IsEmpty]: Start isEmpty. Operand 11337 states and 17216 transitions. [2020-07-21 23:50:00,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 23:50:00,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:00,644 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:00,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:00,852 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:00,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:00,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1745669268, now seen corresponding path program 1 times [2020-07-21 23:50:00,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:00,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910199881] [2020-07-21 23:50:00,854 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 23:50:01,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:50:01,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:01,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 1178 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:50:01,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:01,552 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 23:50:01,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:01,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910199881] [2020-07-21 23:50:01,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:01,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:50:01,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451433843] [2020-07-21 23:50:01,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:50:01,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:01,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:50:01,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:50:01,555 INFO L87 Difference]: Start difference. First operand 11337 states and 17216 transitions. Second operand 4 states. [2020-07-21 23:50:02,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:02,523 INFO L93 Difference]: Finished difference Result 31669 states and 47873 transitions. [2020-07-21 23:50:02,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:02,523 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 326 [2020-07-21 23:50:02,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:02,548 INFO L225 Difference]: With dead ends: 31669 [2020-07-21 23:50:02,548 INFO L226 Difference]: Without dead ends: 21820 [2020-07-21 23:50:02,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:50:02,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21820 states. [2020-07-21 23:50:03,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21820 to 12444. [2020-07-21 23:50:03,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12444 states. [2020-07-21 23:50:03,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12444 states to 12444 states and 18925 transitions. [2020-07-21 23:50:03,253 INFO L78 Accepts]: Start accepts. Automaton has 12444 states and 18925 transitions. Word has length 326 [2020-07-21 23:50:03,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:03,254 INFO L479 AbstractCegarLoop]: Abstraction has 12444 states and 18925 transitions. [2020-07-21 23:50:03,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:50:03,254 INFO L276 IsEmpty]: Start isEmpty. Operand 12444 states and 18925 transitions. [2020-07-21 23:50:03,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 23:50:03,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:03,313 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:03,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:03,514 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:03,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:03,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1151235582, now seen corresponding path program 1 times [2020-07-21 23:50:03,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:03,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879270434] [2020-07-21 23:50:03,515 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 23:50:03,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:03,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:03,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 1497 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:03,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:03,860 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 23:50:03,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:03,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879270434] [2020-07-21 23:50:03,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:03,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:03,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522016537] [2020-07-21 23:50:03,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:03,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:03,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:03,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:03,862 INFO L87 Difference]: Start difference. First operand 12444 states and 18925 transitions. Second operand 3 states. [2020-07-21 23:50:04,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:04,641 INFO L93 Difference]: Finished difference Result 24400 states and 37143 transitions. [2020-07-21 23:50:04,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:04,642 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 23:50:04,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:04,661 INFO L225 Difference]: With dead ends: 24400 [2020-07-21 23:50:04,661 INFO L226 Difference]: Without dead ends: 17006 [2020-07-21 23:50:04,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 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 23:50:04,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17006 states. [2020-07-21 23:50:05,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17006 to 15004. [2020-07-21 23:50:05,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15004 states. [2020-07-21 23:50:05,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15004 states to 15004 states and 22953 transitions. [2020-07-21 23:50:05,466 INFO L78 Accepts]: Start accepts. Automaton has 15004 states and 22953 transitions. Word has length 326 [2020-07-21 23:50:05,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:05,467 INFO L479 AbstractCegarLoop]: Abstraction has 15004 states and 22953 transitions. [2020-07-21 23:50:05,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:05,467 INFO L276 IsEmpty]: Start isEmpty. Operand 15004 states and 22953 transitions. [2020-07-21 23:50:05,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-21 23:50:05,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:05,476 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:05,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:05,677 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:05,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:05,678 INFO L82 PathProgramCache]: Analyzing trace with hash -267651829, now seen corresponding path program 1 times [2020-07-21 23:50:05,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:05,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187005454] [2020-07-21 23:50:05,679 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 23:50:05,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:05,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:05,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 1496 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:05,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:06,040 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 23:50:06,040 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:06,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187005454] [2020-07-21 23:50:06,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:06,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:06,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714226039] [2020-07-21 23:50:06,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:06,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:06,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:06,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:06,043 INFO L87 Difference]: Start difference. First operand 15004 states and 22953 transitions. Second operand 3 states. [2020-07-21 23:50:07,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:07,500 INFO L93 Difference]: Finished difference Result 40331 states and 61413 transitions. [2020-07-21 23:50:07,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:07,502 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-21 23:50:07,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:07,527 INFO L225 Difference]: With dead ends: 40331 [2020-07-21 23:50:07,527 INFO L226 Difference]: Without dead ends: 27849 [2020-07-21 23:50:07,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 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 23:50:07,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27849 states. [2020-07-21 23:50:08,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27849 to 27847. [2020-07-21 23:50:08,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27847 states. [2020-07-21 23:50:08,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27847 states to 27847 states and 42261 transitions. [2020-07-21 23:50:08,793 INFO L78 Accepts]: Start accepts. Automaton has 27847 states and 42261 transitions. Word has length 326 [2020-07-21 23:50:08,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:08,793 INFO L479 AbstractCegarLoop]: Abstraction has 27847 states and 42261 transitions. [2020-07-21 23:50:08,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:08,794 INFO L276 IsEmpty]: Start isEmpty. Operand 27847 states and 42261 transitions. [2020-07-21 23:50:08,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 23:50:08,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:08,811 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] [2020-07-21 23:50:09,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:09,027 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:09,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:09,028 INFO L82 PathProgramCache]: Analyzing trace with hash -2139894551, now seen corresponding path program 1 times [2020-07-21 23:50:09,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:09,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433521402] [2020-07-21 23:50:09,029 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 23:50:09,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:09,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:09,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 1502 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:50:09,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:09,525 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 23:50:09,526 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:09,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433521402] [2020-07-21 23:50:09,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:09,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:50:09,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606086096] [2020-07-21 23:50:09,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:50:09,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:09,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:50:09,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:50:09,528 INFO L87 Difference]: Start difference. First operand 27847 states and 42261 transitions. Second operand 4 states. [2020-07-21 23:50:12,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:12,942 INFO L93 Difference]: Finished difference Result 77630 states and 117458 transitions. [2020-07-21 23:50:12,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:12,943 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 327 [2020-07-21 23:50:12,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:12,996 INFO L225 Difference]: With dead ends: 77630 [2020-07-21 23:50:12,996 INFO L226 Difference]: Without dead ends: 52598 [2020-07-21 23:50:13,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:50:13,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52598 states. [2020-07-21 23:50:15,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52598 to 52596. [2020-07-21 23:50:15,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52596 states. [2020-07-21 23:50:15,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52596 states to 52596 states and 79247 transitions. [2020-07-21 23:50:15,680 INFO L78 Accepts]: Start accepts. Automaton has 52596 states and 79247 transitions. Word has length 327 [2020-07-21 23:50:15,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:15,681 INFO L479 AbstractCegarLoop]: Abstraction has 52596 states and 79247 transitions. [2020-07-21 23:50:15,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:50:15,681 INFO L276 IsEmpty]: Start isEmpty. Operand 52596 states and 79247 transitions. [2020-07-21 23:50:15,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-21 23:50:15,715 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:15,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:15,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:15,930 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:15,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:15,931 INFO L82 PathProgramCache]: Analyzing trace with hash 770870562, now seen corresponding path program 1 times [2020-07-21 23:50:15,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:15,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492685672] [2020-07-21 23:50:15,932 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 23:50:16,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:50:16,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:16,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:16,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:16,222 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 23:50:16,222 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:16,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492685672] [2020-07-21 23:50:16,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:16,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:16,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635031179] [2020-07-21 23:50:16,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:16,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:16,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:16,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:16,230 INFO L87 Difference]: Start difference. First operand 52596 states and 79247 transitions. Second operand 3 states. [2020-07-21 23:50:22,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:22,451 INFO L93 Difference]: Finished difference Result 146084 states and 219322 transitions. [2020-07-21 23:50:22,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:22,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 328 [2020-07-21 23:50:22,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:22,561 INFO L225 Difference]: With dead ends: 146084 [2020-07-21 23:50:22,561 INFO L226 Difference]: Without dead ends: 98730 [2020-07-21 23:50:22,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 326 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 23:50:22,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98730 states. [2020-07-21 23:50:25,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98730 to 53248. [2020-07-21 23:50:25,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53248 states. [2020-07-21 23:50:25,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53248 states to 53248 states and 79958 transitions. [2020-07-21 23:50:25,793 INFO L78 Accepts]: Start accepts. Automaton has 53248 states and 79958 transitions. Word has length 328 [2020-07-21 23:50:25,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:25,793 INFO L479 AbstractCegarLoop]: Abstraction has 53248 states and 79958 transitions. [2020-07-21 23:50:25,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:25,793 INFO L276 IsEmpty]: Start isEmpty. Operand 53248 states and 79958 transitions. [2020-07-21 23:50:25,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 23:50:25,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:25,823 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] [2020-07-21 23:50:26,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:26,024 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:26,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:26,024 INFO L82 PathProgramCache]: Analyzing trace with hash 423829686, now seen corresponding path program 1 times [2020-07-21 23:50:26,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:26,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [468865851] [2020-07-21 23:50:26,026 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 23:50:26,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:50:26,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:26,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 1505 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:50:26,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:26,681 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 23:50:26,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:26,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [468865851] [2020-07-21 23:50:26,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:26,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:50:26,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70012510] [2020-07-21 23:50:26,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:50:26,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:26,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:50:26,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:50:26,684 INFO L87 Difference]: Start difference. First operand 53248 states and 79958 transitions. Second operand 3 states. [2020-07-21 23:50:33,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:33,337 INFO L93 Difference]: Finished difference Result 143535 states and 214774 transitions. [2020-07-21 23:50:33,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:50:33,337 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 329 [2020-07-21 23:50:33,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:33,432 INFO L225 Difference]: With dead ends: 143535 [2020-07-21 23:50:33,432 INFO L226 Difference]: Without dead ends: 98828 [2020-07-21 23:50:33,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 327 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 23:50:33,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98828 states. [2020-07-21 23:50:39,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98828 to 98826. [2020-07-21 23:50:39,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98826 states. [2020-07-21 23:50:39,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98826 states to 98826 states and 147302 transitions. [2020-07-21 23:50:39,211 INFO L78 Accepts]: Start accepts. Automaton has 98826 states and 147302 transitions. Word has length 329 [2020-07-21 23:50:39,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:50:39,211 INFO L479 AbstractCegarLoop]: Abstraction has 98826 states and 147302 transitions. [2020-07-21 23:50:39,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:50:39,211 INFO L276 IsEmpty]: Start isEmpty. Operand 98826 states and 147302 transitions. [2020-07-21 23:50:39,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 23:50:39,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:50:39,257 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:50:39,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:50:39,459 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:50:39,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:50:39,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1401935298, now seen corresponding path program 1 times [2020-07-21 23:50:39,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:50:39,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [625750181] [2020-07-21 23:50:39,461 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 23:50:39,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:50:39,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:50:39,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:50:39,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:50:39,752 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 23:50:39,753 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:50:39,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [625750181] [2020-07-21 23:50:39,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:50:39,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:50:39,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834835186] [2020-07-21 23:50:39,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:50:39,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:50:39,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:50:39,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:50:39,754 INFO L87 Difference]: Start difference. First operand 98826 states and 147302 transitions. Second operand 4 states. [2020-07-21 23:50:51,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:50:51,853 INFO L93 Difference]: Finished difference Result 284248 states and 423806 transitions. [2020-07-21 23:50:51,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:50:51,853 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-21 23:50:51,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:50:52,061 INFO L225 Difference]: With dead ends: 284248 [2020-07-21 23:50:52,061 INFO L226 Difference]: Without dead ends: 193847 [2020-07-21 23:50:52,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 327 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 23:50:52,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193847 states. [2020-07-21 23:51:01,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193847 to 103185. [2020-07-21 23:51:01,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103185 states. [2020-07-21 23:51:01,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103185 states to 103185 states and 154086 transitions. [2020-07-21 23:51:01,745 INFO L78 Accepts]: Start accepts. Automaton has 103185 states and 154086 transitions. Word has length 330 [2020-07-21 23:51:01,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:51:01,746 INFO L479 AbstractCegarLoop]: Abstraction has 103185 states and 154086 transitions. [2020-07-21 23:51:01,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:51:01,746 INFO L276 IsEmpty]: Start isEmpty. Operand 103185 states and 154086 transitions. [2020-07-21 23:51:02,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-21 23:51:02,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:51:02,035 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:51:02,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:51:02,236 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:51:02,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:51:02,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1588878512, now seen corresponding path program 1 times [2020-07-21 23:51:02,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:51:02,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419849946] [2020-07-21 23:51:02,237 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 23:51:02,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:51:02,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:51:02,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 1512 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:51:02,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:51:02,624 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 23:51:02,624 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:51:02,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419849946] [2020-07-21 23:51:02,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:51:02,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:51:02,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604164878] [2020-07-21 23:51:02,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:51:02,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:51:02,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:51:02,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:51:02,627 INFO L87 Difference]: Start difference. First operand 103185 states and 154086 transitions. Second operand 4 states. [2020-07-21 23:51:14,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:51:14,956 INFO L93 Difference]: Finished difference Result 300606 states and 448707 transitions. [2020-07-21 23:51:14,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:51:14,957 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-21 23:51:14,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:51:15,185 INFO L225 Difference]: With dead ends: 300606 [2020-07-21 23:51:15,185 INFO L226 Difference]: Without dead ends: 198976 [2020-07-21 23:51:15,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 327 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 23:51:15,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198976 states. [2020-07-21 23:51:31,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198976 to 198826. [2020-07-21 23:51:31,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198826 states. [2020-07-21 23:51:31,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198826 states to 198826 states and 294593 transitions. [2020-07-21 23:51:31,412 INFO L78 Accepts]: Start accepts. Automaton has 198826 states and 294593 transitions. Word has length 330 [2020-07-21 23:51:31,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:51:31,413 INFO L479 AbstractCegarLoop]: Abstraction has 198826 states and 294593 transitions. [2020-07-21 23:51:31,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:51:31,413 INFO L276 IsEmpty]: Start isEmpty. Operand 198826 states and 294593 transitions. [2020-07-21 23:51:31,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-21 23:51:31,522 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:51:31,522 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:51:31,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:51:31,723 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:51:31,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:51:31,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1969020588, now seen corresponding path program 1 times [2020-07-21 23:51:31,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:51:31,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230216573] [2020-07-21 23:51:31,725 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 23:51:31,956 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:51:31,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:51:31,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 1183 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:51:31,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:51:32,032 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 23:51:32,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:51:32,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230216573] [2020-07-21 23:51:32,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:51:32,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:51:32,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865421647] [2020-07-21 23:51:32,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:51:32,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:51:32,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:51:32,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:51:32,035 INFO L87 Difference]: Start difference. First operand 198826 states and 294593 transitions. Second operand 4 states. [2020-07-21 23:51:59,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:51:59,671 INFO L93 Difference]: Finished difference Result 566554 states and 838337 transitions. [2020-07-21 23:51:59,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:51:59,673 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-07-21 23:51:59,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:52:00,118 INFO L225 Difference]: With dead ends: 566554 [2020-07-21 23:52:00,118 INFO L226 Difference]: Without dead ends: 373262 [2020-07-21 23:52:00,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:52:00,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373262 states. [2020-07-21 23:52:35,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373262 to 373196. [2020-07-21 23:52:35,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373196 states. [2020-07-21 23:52:35,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373196 states to 373196 states and 549063 transitions. [2020-07-21 23:52:35,635 INFO L78 Accepts]: Start accepts. Automaton has 373196 states and 549063 transitions. Word has length 332 [2020-07-21 23:52:35,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:52:35,635 INFO L479 AbstractCegarLoop]: Abstraction has 373196 states and 549063 transitions. [2020-07-21 23:52:35,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:52:35,635 INFO L276 IsEmpty]: Start isEmpty. Operand 373196 states and 549063 transitions. [2020-07-21 23:52:35,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-21 23:52:35,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:52:35,827 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 23:52:36,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:52:36,028 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:52:36,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:52:36,029 INFO L82 PathProgramCache]: Analyzing trace with hash -134813653, now seen corresponding path program 1 times [2020-07-21 23:52:36,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:52:36,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809644564] [2020-07-21 23:52:36,030 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 23:52:36,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:52:36,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:52:36,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:52:36,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:52:36,324 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 23:52:36,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:52:36,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809644564] [2020-07-21 23:52:36,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:52:36,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:52:36,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479741356] [2020-07-21 23:52:36,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:52:36,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:52:36,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:52:36,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:52:36,326 INFO L87 Difference]: Start difference. First operand 373196 states and 549063 transitions. Second operand 3 states. [2020-07-21 23:53:20,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:53:20,062 INFO L93 Difference]: Finished difference Result 701373 states and 1031272 transitions. [2020-07-21 23:53:20,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:53:20,062 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 333 [2020-07-21 23:53:20,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:53:20,760 INFO L225 Difference]: With dead ends: 701373 [2020-07-21 23:53:20,760 INFO L226 Difference]: Without dead ends: 531194 [2020-07-21 23:53:20,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 331 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 23:53:21,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531194 states. [2020-07-21 23:53:56,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531194 to 373130. [2020-07-21 23:53:56,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373130 states. [2020-07-21 23:53:57,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373130 states to 373130 states and 548795 transitions. [2020-07-21 23:53:57,894 INFO L78 Accepts]: Start accepts. Automaton has 373130 states and 548795 transitions. Word has length 333 [2020-07-21 23:53:57,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:53:57,895 INFO L479 AbstractCegarLoop]: Abstraction has 373130 states and 548795 transitions. [2020-07-21 23:53:57,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:53:57,895 INFO L276 IsEmpty]: Start isEmpty. Operand 373130 states and 548795 transitions. [2020-07-21 23:53:58,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 23:53:58,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:53:58,081 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:53:58,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:53:58,282 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:53:58,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:53:58,283 INFO L82 PathProgramCache]: Analyzing trace with hash -387091266, now seen corresponding path program 1 times [2020-07-21 23:53:58,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:53:58,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020156722] [2020-07-21 23:53:58,284 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 23:53:58,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:53:58,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:53:58,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 1180 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:53:58,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:53:58,581 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 23:53:58,582 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:53:58,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020156722] [2020-07-21 23:53:58,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:53:58,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:53:58,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534383043] [2020-07-21 23:53:58,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:53:58,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:53:58,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:53:58,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:53:58,586 INFO L87 Difference]: Start difference. First operand 373130 states and 548795 transitions. Second operand 3 states. [2020-07-21 23:55:02,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:55:02,204 INFO L93 Difference]: Finished difference Result 1077563 states and 1582893 transitions. [2020-07-21 23:55:02,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:55:02,205 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 334 [2020-07-21 23:55:02,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:55:03,285 INFO L225 Difference]: With dead ends: 1077563 [2020-07-21 23:55:03,285 INFO L226 Difference]: Without dead ends: 731418 [2020-07-21 23:55:04,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 332 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 23:55:04,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731418 states. [2020-07-21 23:55:45,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731418 to 376168. [2020-07-21 23:55:45,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 376168 states. [2020-07-21 23:55:46,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376168 states to 376168 states and 552668 transitions. [2020-07-21 23:55:46,238 INFO L78 Accepts]: Start accepts. Automaton has 376168 states and 552668 transitions. Word has length 334 [2020-07-21 23:55:46,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:55:46,238 INFO L479 AbstractCegarLoop]: Abstraction has 376168 states and 552668 transitions. [2020-07-21 23:55:46,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:55:46,238 INFO L276 IsEmpty]: Start isEmpty. Operand 376168 states and 552668 transitions. [2020-07-21 23:55:46,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 23:55:46,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:55:46,420 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:55:46,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:55:46,621 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:55:46,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:55:46,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1966909775, now seen corresponding path program 1 times [2020-07-21 23:55:46,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:55:46,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763855316] [2020-07-21 23:55:46,623 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 23:55:46,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:55:46,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:55:46,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 1466 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:55:46,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:55:46,995 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 23:55:46,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:55:46,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763855316] [2020-07-21 23:55:46,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:55:46,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:55:46,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153513902] [2020-07-21 23:55:46,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:55:46,997 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:55:46,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:55:46,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:55:46,997 INFO L87 Difference]: Start difference. First operand 376168 states and 552668 transitions. Second operand 3 states. [2020-07-21 23:56:48,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:56:48,007 INFO L93 Difference]: Finished difference Result 1065570 states and 1564235 transitions. [2020-07-21 23:56:48,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:56:48,008 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 334 [2020-07-21 23:56:48,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:56:48,952 INFO L225 Difference]: With dead ends: 1065570 [2020-07-21 23:56:48,952 INFO L226 Difference]: Without dead ends: 720752 [2020-07-21 23:56:49,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 332 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 23:56:50,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720752 states. [2020-07-21 23:58:05,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720752 to 720750. [2020-07-21 23:58:05,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 720750 states. [2020-07-21 23:58:06,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 720750 states to 720750 states and 1053174 transitions. [2020-07-21 23:58:06,335 INFO L78 Accepts]: Start accepts. Automaton has 720750 states and 1053174 transitions. Word has length 334 [2020-07-21 23:58:06,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:58:06,335 INFO L479 AbstractCegarLoop]: Abstraction has 720750 states and 1053174 transitions. [2020-07-21 23:58:06,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:58:06,335 INFO L276 IsEmpty]: Start isEmpty. Operand 720750 states and 1053174 transitions. [2020-07-21 23:58:06,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-21 23:58:06,722 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:58:06,722 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:58:06,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:06,923 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:58:06,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:58:06,924 INFO L82 PathProgramCache]: Analyzing trace with hash -47654804, now seen corresponding path program 1 times [2020-07-21 23:58:06,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:58:06,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964925935] [2020-07-21 23:58:06,926 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 23:58:08,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:58:08,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:08,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:58:08,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:08,419 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 23:58:08,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:08,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964925935] [2020-07-21 23:58:08,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:08,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:58:08,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391001771] [2020-07-21 23:58:08,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:58:08,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:08,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:58:08,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:58:08,423 INFO L87 Difference]: Start difference. First operand 720750 states and 1053174 transitions. Second operand 4 states. [2020-07-22 00:00:21,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:21,283 INFO L93 Difference]: Finished difference Result 2065798 states and 3015695 transitions. [2020-07-22 00:00:21,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:00:21,283 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 334 [2020-07-22 00:00:21,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:23,804 INFO L225 Difference]: With dead ends: 2065798 [2020-07-22 00:00:23,804 INFO L226 Difference]: Without dead ends: 1402016 [2020-07-22 00:00:24,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:00:25,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1402016 states.