/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 DAGSIZE --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.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 23:11:08,401 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 23:11:08,403 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 23:11:08,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 23:11:08,423 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 23:11:08,424 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 23:11:08,426 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 23:11:08,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 23:11:08,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 23:11:08,430 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 23:11:08,431 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 23:11:08,432 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 23:11:08,432 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 23:11:08,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 23:11:08,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 23:11:08,435 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 23:11:08,436 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 23:11:08,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 23:11:08,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 23:11:08,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 23:11:08,442 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 23:11:08,443 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 23:11:08,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 23:11:08,445 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 23:11:08,448 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 23:11:08,448 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 23:11:08,449 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 23:11:08,449 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 23:11:08,450 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 23:11:08,451 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 23:11:08,451 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 23:11:08,452 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 23:11:08,452 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 23:11:08,453 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 23:11:08,454 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 23:11:08,454 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 23:11:08,455 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 23:11:08,455 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 23:11:08,455 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 23:11:08,456 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 23:11:08,457 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 23:11:08,458 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 23:11:08,472 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 23:11:08,473 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 23:11:08,474 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 23:11:08,474 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 23:11:08,474 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 23:11:08,475 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 23:11:08,475 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 23:11:08,475 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 23:11:08,475 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 23:11:08,475 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 23:11:08,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 23:11:08,476 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 23:11:08,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 23:11:08,476 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 23:11:08,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 23:11:08,477 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 23:11:08,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 23:11:08,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 23:11:08,477 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 23:11:08,477 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 23:11:08,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 23:11:08,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 23:11:08,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 23:11:08,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 23:11:08,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 23:11:08,479 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 23:11:08,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:08,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 23:11:08,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 23:11:08,479 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 23:11:08,755 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 23:11:08,768 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 23:11:08,772 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 23:11:08,773 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 23:11:08,773 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 23:11:08,774 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:11:08,834 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fadc35409/adffe9deadb24d68a89076b56ac80cd8/FLAG0420bbf0d [2020-07-20 23:11:09,540 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 23:11:09,540 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:11:09,571 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fadc35409/adffe9deadb24d68a89076b56ac80cd8/FLAG0420bbf0d [2020-07-20 23:11:09,703 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fadc35409/adffe9deadb24d68a89076b56ac80cd8 [2020-07-20 23:11:09,713 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 23:11:09,716 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 23:11:09,717 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 23:11:09,717 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 23:11:09,721 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 23:11:09,722 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:11:09" (1/1) ... [2020-07-20 23:11:09,725 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d0f554d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:09, skipping insertion in model container [2020-07-20 23:11:09,725 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:11:09" (1/1) ... [2020-07-20 23:11:09,733 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 23:11:09,923 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 23:11:11,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:11:11,496 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 23:11:12,556 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 23:11:12,602 INFO L208 MainTranslator]: Completed translation [2020-07-20 23:11:12,603 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12 WrapperNode [2020-07-20 23:11:12,604 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 23:11:12,605 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 23:11:12,605 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 23:11:12,605 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 23:11:12,626 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,628 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,692 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,778 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,819 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,834 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... [2020-07-20 23:11:12,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 23:11:12,852 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 23:11:12,852 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 23:11:12,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 23:11:12,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 23:11:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 23:11:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 23:11:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 23:11:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 23:11:12,939 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 23:11:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 23:11:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-20 23:11:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 23:11:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 23:11:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 23:11:12,941 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 23:11:12,942 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 23:11:12,942 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 23:11:12,942 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 23:11:12,942 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 23:11:12,943 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 23:11:12,943 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 23:11:12,944 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-20 23:11:12,944 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 23:11:12,944 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 23:11:12,944 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 23:11:12,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 23:11:12,945 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 23:11:17,337 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 23:11:17,338 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 23:11:17,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:11:17 BoogieIcfgContainer [2020-07-20 23:11:17,354 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 23:11:17,356 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 23:11:17,356 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 23:11:17,358 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 23:11:17,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:11:09" (1/3) ... [2020-07-20 23:11:17,359 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e813d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:11:17, skipping insertion in model container [2020-07-20 23:11:17,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:11:12" (2/3) ... [2020-07-20 23:11:17,360 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16e813d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:11:17, skipping insertion in model container [2020-07-20 23:11:17,360 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:11:17" (3/3) ... [2020-07-20 23:11:17,362 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+nlh-reducer.c [2020-07-20 23:11:17,373 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 23:11:17,382 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 23:11:17,397 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 23:11:17,432 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 23:11:17,432 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 23:11:17,432 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 23:11:17,432 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 23:11:17,433 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 23:11:17,433 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 23:11:17,433 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 23:11:17,433 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 23:11:17,476 INFO L276 IsEmpty]: Start isEmpty. Operand 1449 states. [2020-07-20 23:11:17,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 23:11:17,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:17,511 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:17,511 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:17,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:17,519 INFO L82 PathProgramCache]: Analyzing trace with hash -2033441387, now seen corresponding path program 1 times [2020-07-20 23:11:17,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:17,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522147704] [2020-07-20 23:11:17,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:17,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:17,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:17,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 1448 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 23:11:18,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:18,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:18,445 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:18,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522147704] [2020-07-20 23:11:18,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:18,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:18,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139975271] [2020-07-20 23:11:18,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:18,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:18,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:18,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:18,472 INFO L87 Difference]: Start difference. First operand 1449 states. Second operand 3 states. [2020-07-20 23:11:18,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:18,897 INFO L93 Difference]: Finished difference Result 1974 states and 3501 transitions. [2020-07-20 23:11:18,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:18,899 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-20 23:11:18,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:18,931 INFO L225 Difference]: With dead ends: 1974 [2020-07-20 23:11:18,932 INFO L226 Difference]: Without dead ends: 1732 [2020-07-20 23:11:18,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:18,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1732 states. [2020-07-20 23:11:19,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1732 to 1730. [2020-07-20 23:11:19,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1730 states. [2020-07-20 23:11:19,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1730 states to 1730 states and 2860 transitions. [2020-07-20 23:11:19,081 INFO L78 Accepts]: Start accepts. Automaton has 1730 states and 2860 transitions. Word has length 496 [2020-07-20 23:11:19,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:19,082 INFO L479 AbstractCegarLoop]: Abstraction has 1730 states and 2860 transitions. [2020-07-20 23:11:19,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:19,083 INFO L276 IsEmpty]: Start isEmpty. Operand 1730 states and 2860 transitions. [2020-07-20 23:11:19,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-20 23:11:19,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:19,095 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:19,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:19,309 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:19,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:19,310 INFO L82 PathProgramCache]: Analyzing trace with hash 426855444, now seen corresponding path program 1 times [2020-07-20 23:11:19,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:19,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341670913] [2020-07-20 23:11:19,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:19,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:19,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:19,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 1894 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:11:19,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:20,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:20,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341670913] [2020-07-20 23:11:20,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:20,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:11:20,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059906773] [2020-07-20 23:11:20,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:11:20,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:20,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:11:20,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:11:20,191 INFO L87 Difference]: Start difference. First operand 1730 states and 2860 transitions. Second operand 4 states. [2020-07-20 23:11:20,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:20,513 INFO L93 Difference]: Finished difference Result 5127 states and 8477 transitions. [2020-07-20 23:11:20,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:11:20,514 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 496 [2020-07-20 23:11:20,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:20,534 INFO L225 Difference]: With dead ends: 5127 [2020-07-20 23:11:20,534 INFO L226 Difference]: Without dead ends: 3412 [2020-07-20 23:11:20,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:11:20,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3412 states. [2020-07-20 23:11:20,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3412 to 3410. [2020-07-20 23:11:20,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3410 states. [2020-07-20 23:11:20,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 5616 transitions. [2020-07-20 23:11:20,682 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 5616 transitions. Word has length 496 [2020-07-20 23:11:20,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:20,683 INFO L479 AbstractCegarLoop]: Abstraction has 3410 states and 5616 transitions. [2020-07-20 23:11:20,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:11:20,683 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 5616 transitions. [2020-07-20 23:11:20,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 499 [2020-07-20 23:11:20,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:20,698 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:20,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:20,913 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:20,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:20,913 INFO L82 PathProgramCache]: Analyzing trace with hash 598630969, now seen corresponding path program 1 times [2020-07-20 23:11:20,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:20,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926391126] [2020-07-20 23:11:20,915 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:21,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:21,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:21,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:21,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:21,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:21,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:21,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926391126] [2020-07-20 23:11:21,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:21,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:21,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036044697] [2020-07-20 23:11:21,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:21,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:21,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:21,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:21,661 INFO L87 Difference]: Start difference. First operand 3410 states and 5616 transitions. Second operand 3 states. [2020-07-20 23:11:22,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:22,150 INFO L93 Difference]: Finished difference Result 9907 states and 16272 transitions. [2020-07-20 23:11:22,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:22,151 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 498 [2020-07-20 23:11:22,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:22,197 INFO L225 Difference]: With dead ends: 9907 [2020-07-20 23:11:22,197 INFO L226 Difference]: Without dead ends: 6726 [2020-07-20 23:11:22,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:22,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6726 states. [2020-07-20 23:11:22,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6726 to 6724. [2020-07-20 23:11:22,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6724 states. [2020-07-20 23:11:22,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6724 states to 6724 states and 11036 transitions. [2020-07-20 23:11:22,531 INFO L78 Accepts]: Start accepts. Automaton has 6724 states and 11036 transitions. Word has length 498 [2020-07-20 23:11:22,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:22,532 INFO L479 AbstractCegarLoop]: Abstraction has 6724 states and 11036 transitions. [2020-07-20 23:11:22,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:22,532 INFO L276 IsEmpty]: Start isEmpty. Operand 6724 states and 11036 transitions. [2020-07-20 23:11:22,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 23:11:22,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:22,575 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:22,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:22,790 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:22,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:22,791 INFO L82 PathProgramCache]: Analyzing trace with hash 74932662, now seen corresponding path program 1 times [2020-07-20 23:11:22,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:22,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [297156812] [2020-07-20 23:11:22,792 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:23,269 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:23,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:23,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 1899 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:23,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:23,479 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:23,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [297156812] [2020-07-20 23:11:23,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:23,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:23,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993571230] [2020-07-20 23:11:23,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:23,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:23,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:23,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:23,482 INFO L87 Difference]: Start difference. First operand 6724 states and 11036 transitions. Second operand 3 states. [2020-07-20 23:11:23,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:23,840 INFO L93 Difference]: Finished difference Result 19916 states and 32645 transitions. [2020-07-20 23:11:23,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:23,841 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-20 23:11:23,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:23,908 INFO L225 Difference]: With dead ends: 19916 [2020-07-20 23:11:23,909 INFO L226 Difference]: Without dead ends: 13223 [2020-07-20 23:11:23,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:23,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13223 states. [2020-07-20 23:11:24,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13223 to 6750. [2020-07-20 23:11:24,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6750 states. [2020-07-20 23:11:24,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6750 states to 6750 states and 11074 transitions. [2020-07-20 23:11:24,338 INFO L78 Accepts]: Start accepts. Automaton has 6750 states and 11074 transitions. Word has length 499 [2020-07-20 23:11:24,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:24,338 INFO L479 AbstractCegarLoop]: Abstraction has 6750 states and 11074 transitions. [2020-07-20 23:11:24,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:24,339 INFO L276 IsEmpty]: Start isEmpty. Operand 6750 states and 11074 transitions. [2020-07-20 23:11:24,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 23:11:24,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:24,362 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:24,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:24,577 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:24,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:24,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1851088404, now seen corresponding path program 1 times [2020-07-20 23:11:24,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:24,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431421802] [2020-07-20 23:11:24,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:25,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:25,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:25,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1898 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:25,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:25,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:25,329 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:25,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431421802] [2020-07-20 23:11:25,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:25,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:25,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614048691] [2020-07-20 23:11:25,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:25,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:25,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:25,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:25,332 INFO L87 Difference]: Start difference. First operand 6750 states and 11074 transitions. Second operand 3 states. [2020-07-20 23:11:25,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:25,818 INFO L93 Difference]: Finished difference Result 19714 states and 32282 transitions. [2020-07-20 23:11:25,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:25,818 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 23:11:25,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:25,854 INFO L225 Difference]: With dead ends: 19714 [2020-07-20 23:11:25,855 INFO L226 Difference]: Without dead ends: 13276 [2020-07-20 23:11:25,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:25,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13276 states. [2020-07-20 23:11:26,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13276 to 13274. [2020-07-20 23:11:26,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13274 states. [2020-07-20 23:11:26,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13274 states to 13274 states and 21693 transitions. [2020-07-20 23:11:26,944 INFO L78 Accepts]: Start accepts. Automaton has 13274 states and 21693 transitions. Word has length 500 [2020-07-20 23:11:26,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:26,944 INFO L479 AbstractCegarLoop]: Abstraction has 13274 states and 21693 transitions. [2020-07-20 23:11:26,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:26,945 INFO L276 IsEmpty]: Start isEmpty. Operand 13274 states and 21693 transitions. [2020-07-20 23:11:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-20 23:11:26,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:26,971 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:27,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:27,185 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:27,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:27,185 INFO L82 PathProgramCache]: Analyzing trace with hash 444801881, now seen corresponding path program 1 times [2020-07-20 23:11:27,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:27,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779291807] [2020-07-20 23:11:27,186 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:27,516 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:27,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:27,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1449 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:27,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:27,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:27,660 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:27,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779291807] [2020-07-20 23:11:27,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:27,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:27,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575438130] [2020-07-20 23:11:27,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:27,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:27,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:27,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:27,663 INFO L87 Difference]: Start difference. First operand 13274 states and 21693 transitions. Second operand 3 states. [2020-07-20 23:11:28,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:28,370 INFO L93 Difference]: Finished difference Result 39686 states and 64847 transitions. [2020-07-20 23:11:28,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:28,371 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-20 23:11:28,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:28,438 INFO L225 Difference]: With dead ends: 39686 [2020-07-20 23:11:28,439 INFO L226 Difference]: Without dead ends: 26476 [2020-07-20 23:11:28,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:28,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26476 states. [2020-07-20 23:11:28,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26476 to 13350. [2020-07-20 23:11:28,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13350 states. [2020-07-20 23:11:29,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13350 states to 13350 states and 21799 transitions. [2020-07-20 23:11:29,010 INFO L78 Accepts]: Start accepts. Automaton has 13350 states and 21799 transitions. Word has length 500 [2020-07-20 23:11:29,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:29,010 INFO L479 AbstractCegarLoop]: Abstraction has 13350 states and 21799 transitions. [2020-07-20 23:11:29,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:29,010 INFO L276 IsEmpty]: Start isEmpty. Operand 13350 states and 21799 transitions. [2020-07-20 23:11:29,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 23:11:29,033 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:29,034 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:29,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:29,248 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:29,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:29,249 INFO L82 PathProgramCache]: Analyzing trace with hash 397975741, now seen corresponding path program 1 times [2020-07-20 23:11:29,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:29,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127096750] [2020-07-20 23:11:29,251 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:29,714 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:29,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:29,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 1904 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:29,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:29,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:29,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:29,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127096750] [2020-07-20 23:11:29,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:30,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:30,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526485915] [2020-07-20 23:11:30,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:30,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:30,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:30,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:30,002 INFO L87 Difference]: Start difference. First operand 13350 states and 21799 transitions. Second operand 3 states. [2020-07-20 23:11:30,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:30,504 INFO L93 Difference]: Finished difference Result 39842 states and 65063 transitions. [2020-07-20 23:11:30,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:30,504 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-20 23:11:30,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:30,556 INFO L225 Difference]: With dead ends: 39842 [2020-07-20 23:11:30,557 INFO L226 Difference]: Without dead ends: 26568 [2020-07-20 23:11:30,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:30,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26568 states. [2020-07-20 23:11:31,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26568 to 13442. [2020-07-20 23:11:31,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13442 states. [2020-07-20 23:11:31,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13442 states to 13442 states and 21925 transitions. [2020-07-20 23:11:31,454 INFO L78 Accepts]: Start accepts. Automaton has 13442 states and 21925 transitions. Word has length 501 [2020-07-20 23:11:31,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:31,454 INFO L479 AbstractCegarLoop]: Abstraction has 13442 states and 21925 transitions. [2020-07-20 23:11:31,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:31,455 INFO L276 IsEmpty]: Start isEmpty. Operand 13442 states and 21925 transitions. [2020-07-20 23:11:31,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 23:11:31,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:31,476 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:31,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:31,690 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:31,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:31,691 INFO L82 PathProgramCache]: Analyzing trace with hash 815858906, now seen corresponding path program 1 times [2020-07-20 23:11:31,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:31,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017806825] [2020-07-20 23:11:31,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:32,040 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:11:32,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:32,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 1466 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 23:11:32,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:32,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:32,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:32,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017806825] [2020-07-20 23:11:32,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:32,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 23:11:32,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423825302] [2020-07-20 23:11:32,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 23:11:32,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:32,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 23:11:32,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 23:11:32,238 INFO L87 Difference]: Start difference. First operand 13442 states and 21925 transitions. Second operand 9 states. [2020-07-20 23:11:43,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:43,174 INFO L93 Difference]: Finished difference Result 101669 states and 165041 transitions. [2020-07-20 23:11:43,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 23:11:43,174 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 502 [2020-07-20 23:11:43,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:43,341 INFO L225 Difference]: With dead ends: 101669 [2020-07-20 23:11:43,341 INFO L226 Difference]: Without dead ends: 98631 [2020-07-20 23:11:43,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 533 GetRequests, 496 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 23:11:43,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98631 states. [2020-07-20 23:11:45,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98631 to 32504. [2020-07-20 23:11:45,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32504 states. [2020-07-20 23:11:45,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32504 states to 32504 states and 52579 transitions. [2020-07-20 23:11:45,265 INFO L78 Accepts]: Start accepts. Automaton has 32504 states and 52579 transitions. Word has length 502 [2020-07-20 23:11:45,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:45,266 INFO L479 AbstractCegarLoop]: Abstraction has 32504 states and 52579 transitions. [2020-07-20 23:11:45,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 23:11:45,266 INFO L276 IsEmpty]: Start isEmpty. Operand 32504 states and 52579 transitions. [2020-07-20 23:11:45,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 23:11:45,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:45,303 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:45,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:45,517 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:45,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:45,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1949345144, now seen corresponding path program 1 times [2020-07-20 23:11:45,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:45,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399850316] [2020-07-20 23:11:45,520 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:45,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:45,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:45,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 1915 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:45,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:46,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:46,130 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:46,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399850316] [2020-07-20 23:11:46,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:46,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:46,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837352758] [2020-07-20 23:11:46,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:46,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:46,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:46,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:46,133 INFO L87 Difference]: Start difference. First operand 32504 states and 52579 transitions. Second operand 3 states. [2020-07-20 23:11:48,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:48,026 INFO L93 Difference]: Finished difference Result 75490 states and 121971 transitions. [2020-07-20 23:11:48,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:48,027 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 23:11:48,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:48,112 INFO L225 Difference]: With dead ends: 75490 [2020-07-20 23:11:48,112 INFO L226 Difference]: Without dead ends: 47454 [2020-07-20 23:11:48,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:48,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47454 states. [2020-07-20 23:11:51,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47454 to 41670. [2020-07-20 23:11:51,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41670 states. [2020-07-20 23:11:51,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41670 states to 41670 states and 67737 transitions. [2020-07-20 23:11:51,231 INFO L78 Accepts]: Start accepts. Automaton has 41670 states and 67737 transitions. Word has length 502 [2020-07-20 23:11:51,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:11:51,232 INFO L479 AbstractCegarLoop]: Abstraction has 41670 states and 67737 transitions. [2020-07-20 23:11:51,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:11:51,232 INFO L276 IsEmpty]: Start isEmpty. Operand 41670 states and 67737 transitions. [2020-07-20 23:11:51,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 23:11:51,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:11:51,254 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:11:51,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:51,455 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:11:51,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:11:51,456 INFO L82 PathProgramCache]: Analyzing trace with hash -940914161, now seen corresponding path program 1 times [2020-07-20 23:11:51,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:11:51,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819800910] [2020-07-20 23:11:51,457 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:11:51,871 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:11:51,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:11:51,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 1903 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:11:51,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:11:52,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:11:52,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:11:52,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819800910] [2020-07-20 23:11:52,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:11:52,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:11:52,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793151059] [2020-07-20 23:11:52,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:11:52,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:11:52,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:11:52,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:52,308 INFO L87 Difference]: Start difference. First operand 41670 states and 67737 transitions. Second operand 3 states. [2020-07-20 23:11:55,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:11:55,393 INFO L93 Difference]: Finished difference Result 122621 states and 199168 transitions. [2020-07-20 23:11:55,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:11:55,393 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 502 [2020-07-20 23:11:55,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:11:55,492 INFO L225 Difference]: With dead ends: 122621 [2020-07-20 23:11:55,492 INFO L226 Difference]: Without dead ends: 81859 [2020-07-20 23:11:55,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:11:55,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81859 states. [2020-07-20 23:12:00,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81859 to 81857. [2020-07-20 23:12:00,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81857 states. [2020-07-20 23:12:00,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81857 states to 81857 states and 132620 transitions. [2020-07-20 23:12:00,356 INFO L78 Accepts]: Start accepts. Automaton has 81857 states and 132620 transitions. Word has length 502 [2020-07-20 23:12:00,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:00,357 INFO L479 AbstractCegarLoop]: Abstraction has 81857 states and 132620 transitions. [2020-07-20 23:12:00,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:12:00,357 INFO L276 IsEmpty]: Start isEmpty. Operand 81857 states and 132620 transitions. [2020-07-20 23:12:00,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 23:12:00,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:00,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:12:00,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:00,623 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:00,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:00,624 INFO L82 PathProgramCache]: Analyzing trace with hash 227329196, now seen corresponding path program 1 times [2020-07-20 23:12:00,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:00,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533960460] [2020-07-20 23:12:00,626 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:01,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:12:01,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:01,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 1451 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 23:12:01,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:01,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:12:01,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:01,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533960460] [2020-07-20 23:12:01,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:01,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:12:01,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348611371] [2020-07-20 23:12:01,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:12:01,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:01,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:12:01,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:12:01,450 INFO L87 Difference]: Start difference. First operand 81857 states and 132620 transitions. Second operand 4 states. [2020-07-20 23:12:08,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:12:08,857 INFO L93 Difference]: Finished difference Result 237995 states and 384964 transitions. [2020-07-20 23:12:08,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:12:08,858 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 502 [2020-07-20 23:12:08,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:12:09,056 INFO L225 Difference]: With dead ends: 237995 [2020-07-20 23:12:09,056 INFO L226 Difference]: Without dead ends: 158341 [2020-07-20 23:12:09,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:12:09,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158341 states. [2020-07-20 23:12:13,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158341 to 83198. [2020-07-20 23:12:13,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83198 states. [2020-07-20 23:12:13,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83198 states to 83198 states and 135004 transitions. [2020-07-20 23:12:13,417 INFO L78 Accepts]: Start accepts. Automaton has 83198 states and 135004 transitions. Word has length 502 [2020-07-20 23:12:13,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:13,417 INFO L479 AbstractCegarLoop]: Abstraction has 83198 states and 135004 transitions. [2020-07-20 23:12:13,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:12:13,417 INFO L276 IsEmpty]: Start isEmpty. Operand 83198 states and 135004 transitions. [2020-07-20 23:12:13,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 23:12:13,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:13,466 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:12:13,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:13,680 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:13,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:13,681 INFO L82 PathProgramCache]: Analyzing trace with hash -980640222, now seen corresponding path program 1 times [2020-07-20 23:12:13,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:13,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698902138] [2020-07-20 23:12:13,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:15,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:12:15,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:15,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 1914 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:12:15,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:15,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:12:15,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:15,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698902138] [2020-07-20 23:12:15,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:15,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:12:15,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983897252] [2020-07-20 23:12:15,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:12:15,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:15,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:12:15,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:12:15,960 INFO L87 Difference]: Start difference. First operand 83198 states and 135004 transitions. Second operand 3 states. [2020-07-20 23:12:22,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:12:22,206 INFO L93 Difference]: Finished difference Result 209826 states and 341182 transitions. [2020-07-20 23:12:22,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:12:22,208 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-20 23:12:22,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:12:22,401 INFO L225 Difference]: With dead ends: 209826 [2020-07-20 23:12:22,401 INFO L226 Difference]: Without dead ends: 136836 [2020-07-20 23:12:22,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:12:22,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136836 states. [2020-07-20 23:12:28,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136836 to 121242. [2020-07-20 23:12:28,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121242 states. [2020-07-20 23:12:28,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121242 states to 121242 states and 197508 transitions. [2020-07-20 23:12:28,985 INFO L78 Accepts]: Start accepts. Automaton has 121242 states and 197508 transitions. Word has length 504 [2020-07-20 23:12:28,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:28,985 INFO L479 AbstractCegarLoop]: Abstraction has 121242 states and 197508 transitions. [2020-07-20 23:12:28,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:12:28,985 INFO L276 IsEmpty]: Start isEmpty. Operand 121242 states and 197508 transitions. [2020-07-20 23:12:29,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 23:12:29,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:12:29,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:12:29,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:29,222 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:12:29,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:12:29,222 INFO L82 PathProgramCache]: Analyzing trace with hash 359846569, now seen corresponding path program 1 times [2020-07-20 23:12:29,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:12:29,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013177057] [2020-07-20 23:12:29,224 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:12:29,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:12:29,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:12:29,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 1920 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 23:12:29,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:12:29,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:12:29,960 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:12:29,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013177057] [2020-07-20 23:12:29,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:12:29,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 23:12:29,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626726035] [2020-07-20 23:12:29,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 23:12:29,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:12:29,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 23:12:29,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 23:12:29,962 INFO L87 Difference]: Start difference. First operand 121242 states and 197508 transitions. Second operand 4 states. [2020-07-20 23:12:43,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:12:43,016 INFO L93 Difference]: Finished difference Result 359392 states and 585342 transitions. [2020-07-20 23:12:43,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 23:12:43,017 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-20 23:12:43,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:12:43,366 INFO L225 Difference]: With dead ends: 359392 [2020-07-20 23:12:43,366 INFO L226 Difference]: Without dead ends: 239232 [2020-07-20 23:12:43,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 23:12:43,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239232 states. [2020-07-20 23:12:59,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239232 to 239230. [2020-07-20 23:12:59,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239230 states. [2020-07-20 23:12:59,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239230 states to 239230 states and 388570 transitions. [2020-07-20 23:12:59,937 INFO L78 Accepts]: Start accepts. Automaton has 239230 states and 388570 transitions. Word has length 505 [2020-07-20 23:12:59,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:12:59,937 INFO L479 AbstractCegarLoop]: Abstraction has 239230 states and 388570 transitions. [2020-07-20 23:12:59,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 23:12:59,937 INFO L276 IsEmpty]: Start isEmpty. Operand 239230 states and 388570 transitions. [2020-07-20 23:13:00,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 23:13:00,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:13:00,010 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:13:00,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:00,211 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:13:00,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:13:00,212 INFO L82 PathProgramCache]: Analyzing trace with hash 304002454, now seen corresponding path program 1 times [2020-07-20 23:13:00,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:13:00,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670183442] [2020-07-20 23:13:00,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:00,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 23:13:00,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:13:00,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 1454 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:13:00,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:13:00,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:13:00,739 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:13:00,739 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670183442] [2020-07-20 23:13:00,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:13:00,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:13:00,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077498005] [2020-07-20 23:13:00,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:13:00,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:13:00,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:13:00,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:13:00,743 INFO L87 Difference]: Start difference. First operand 239230 states and 388570 transitions. Second operand 3 states. [2020-07-20 23:13:34,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:13:34,029 INFO L93 Difference]: Finished difference Result 705317 states and 1143394 transitions. [2020-07-20 23:13:34,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:13:34,030 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-20 23:13:34,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:13:34,770 INFO L225 Difference]: With dead ends: 705317 [2020-07-20 23:13:34,771 INFO L226 Difference]: Without dead ends: 472288 [2020-07-20 23:13:34,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:13:35,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472288 states. [2020-07-20 23:13:50,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472288 to 240174. [2020-07-20 23:13:50,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240174 states. [2020-07-20 23:13:51,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240174 states to 240174 states and 389965 transitions. [2020-07-20 23:13:51,322 INFO L78 Accepts]: Start accepts. Automaton has 240174 states and 389965 transitions. Word has length 507 [2020-07-20 23:13:51,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:13:51,322 INFO L479 AbstractCegarLoop]: Abstraction has 240174 states and 389965 transitions. [2020-07-20 23:13:51,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:13:51,322 INFO L276 IsEmpty]: Start isEmpty. Operand 240174 states and 389965 transitions. [2020-07-20 23:13:51,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 23:13:51,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:13:51,399 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:13:51,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:51,600 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:13:51,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:13:51,601 INFO L82 PathProgramCache]: Analyzing trace with hash 920041644, now seen corresponding path program 1 times [2020-07-20 23:13:51,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:13:51,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681986746] [2020-07-20 23:13:51,602 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:13:52,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:13:52,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:13:52,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 1919 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:13:52,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:13:52,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:13:52,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:13:52,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681986746] [2020-07-20 23:13:52,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:13:52,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:13:52,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865452704] [2020-07-20 23:13:52,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:13:52,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:13:52,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:13:52,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:13:52,948 INFO L87 Difference]: Start difference. First operand 240174 states and 389965 transitions. Second operand 3 states. [2020-07-20 23:14:25,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:14:25,837 INFO L93 Difference]: Finished difference Result 707859 states and 1147984 transitions. [2020-07-20 23:14:25,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:14:25,837 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-20 23:14:25,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:14:26,656 INFO L225 Difference]: With dead ends: 707859 [2020-07-20 23:14:26,657 INFO L226 Difference]: Without dead ends: 471577 [2020-07-20 23:14:26,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:14:27,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471577 states. [2020-07-20 23:15:01,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471577 to 471575. [2020-07-20 23:15:01,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 471575 states. [2020-07-20 23:15:02,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471575 states to 471575 states and 762740 transitions. [2020-07-20 23:15:02,454 INFO L78 Accepts]: Start accepts. Automaton has 471575 states and 762740 transitions. Word has length 507 [2020-07-20 23:15:02,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:15:02,454 INFO L479 AbstractCegarLoop]: Abstraction has 471575 states and 762740 transitions. [2020-07-20 23:15:02,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:15:02,455 INFO L276 IsEmpty]: Start isEmpty. Operand 471575 states and 762740 transitions. [2020-07-20 23:15:02,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-20 23:15:02,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:15:02,617 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:15:02,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:02,818 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:15:02,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:15:02,819 INFO L82 PathProgramCache]: Analyzing trace with hash -45068728, now seen corresponding path program 1 times [2020-07-20 23:15:02,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:15:02,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990391905] [2020-07-20 23:15:02,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:15:03,269 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:15:03,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:15:03,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 1919 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:15:03,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:15:04,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:15:04,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:15:04,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990391905] [2020-07-20 23:15:04,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:15:04,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:15:04,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878551326] [2020-07-20 23:15:04,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:15:04,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:15:04,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:15:04,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:15:04,399 INFO L87 Difference]: Start difference. First operand 471575 states and 762740 transitions. Second operand 3 states. [2020-07-20 23:15:59,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:15:59,385 INFO L93 Difference]: Finished difference Result 1004264 states and 1619332 transitions. [2020-07-20 23:15:59,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:15:59,386 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 508 [2020-07-20 23:15:59,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:16:00,617 INFO L225 Difference]: With dead ends: 1004264 [2020-07-20 23:16:00,617 INFO L226 Difference]: Without dead ends: 734925 [2020-07-20 23:16:00,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:16:01,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 734925 states. [2020-07-20 23:16:43,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 734925 to 470079. [2020-07-20 23:16:43,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470079 states. [2020-07-20 23:16:44,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470079 states to 470079 states and 760079 transitions. [2020-07-20 23:16:44,474 INFO L78 Accepts]: Start accepts. Automaton has 470079 states and 760079 transitions. Word has length 508 [2020-07-20 23:16:44,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:16:44,474 INFO L479 AbstractCegarLoop]: Abstraction has 470079 states and 760079 transitions. [2020-07-20 23:16:44,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:16:44,475 INFO L276 IsEmpty]: Start isEmpty. Operand 470079 states and 760079 transitions. [2020-07-20 23:16:44,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-20 23:16:44,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:16:44,619 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:16:44,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:16:44,820 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:16:44,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:16:44,821 INFO L82 PathProgramCache]: Analyzing trace with hash -833023124, now seen corresponding path program 1 times [2020-07-20 23:16:44,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:16:44,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250956697] [2020-07-20 23:16:44,822 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:16:45,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:16:45,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:16:45,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 1919 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:16:45,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:16:45,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:16:45,506 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:16:45,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250956697] [2020-07-20 23:16:45,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:16:45,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:16:45,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895436073] [2020-07-20 23:16:45,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:16:45,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:16:45,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:16:45,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:16:45,508 INFO L87 Difference]: Start difference. First operand 470079 states and 760079 transitions. Second operand 3 states. [2020-07-20 23:17:49,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:17:49,608 INFO L93 Difference]: Finished difference Result 1395250 states and 2255197 transitions. [2020-07-20 23:17:49,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:17:49,609 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 508 [2020-07-20 23:17:49,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:17:52,075 INFO L225 Difference]: With dead ends: 1395250 [2020-07-20 23:17:52,076 INFO L226 Difference]: Without dead ends: 926828 [2020-07-20 23:17:52,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:17:53,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 926828 states. [2020-07-20 23:19:25,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 926828 to 926826. [2020-07-20 23:19:25,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 926826 states. [2020-07-20 23:19:29,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926826 states to 926826 states and 1493341 transitions. [2020-07-20 23:19:29,296 INFO L78 Accepts]: Start accepts. Automaton has 926826 states and 1493341 transitions. Word has length 508 [2020-07-20 23:19:29,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 23:19:29,297 INFO L479 AbstractCegarLoop]: Abstraction has 926826 states and 1493341 transitions. [2020-07-20 23:19:29,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 23:19:29,297 INFO L276 IsEmpty]: Start isEmpty. Operand 926826 states and 1493341 transitions. [2020-07-20 23:19:29,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-20 23:19:29,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 23:19:29,592 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 23:19:29,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:19:29,794 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 23:19:29,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 23:19:29,794 INFO L82 PathProgramCache]: Analyzing trace with hash 358210033, now seen corresponding path program 1 times [2020-07-20 23:19:29,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 23:19:29,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140614751] [2020-07-20 23:19:29,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 23:19:30,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 23:19:30,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 23:19:30,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 1924 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 23:19:30,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 23:19:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 23:19:30,361 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 23:19:30,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140614751] [2020-07-20 23:19:30,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 23:19:30,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 23:19:30,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121882101] [2020-07-20 23:19:30,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 23:19:30,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 23:19:30,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 23:19:30,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:19:30,363 INFO L87 Difference]: Start difference. First operand 926826 states and 1493341 transitions. Second operand 3 states. [2020-07-20 23:21:45,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 23:21:45,468 INFO L93 Difference]: Finished difference Result 2441806 states and 3947295 transitions. [2020-07-20 23:21:45,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 23:21:45,468 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 510 [2020-07-20 23:21:45,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 23:21:48,510 INFO L225 Difference]: With dead ends: 2441806 [2020-07-20 23:21:48,511 INFO L226 Difference]: Without dead ends: 1598220 [2020-07-20 23:21:49,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 508 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 23:21:50,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1598220 states.