/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:57:01,496 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:57:01,499 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:57:01,511 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:57:01,512 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:57:01,513 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:57:01,514 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:57:01,516 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:57:01,517 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:57:01,518 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:57:01,519 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:57:01,520 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:57:01,520 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:57:01,521 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:57:01,522 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:57:01,523 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:57:01,524 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:57:01,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:57:01,527 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:57:01,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:57:01,530 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:57:01,531 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:57:01,532 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:57:01,533 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:57:01,535 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 23:57:01,536 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 23:57:01,536 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 23:57:01,537 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 23:57:01,537 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 23:57:01,538 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 23:57:01,538 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 23:57:01,539 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 23:57:01,540 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 23:57:01,540 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 23:57:01,541 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 23:57:01,541 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 23:57:01,542 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 23:57:01,542 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 23:57:01,543 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:57:01,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:57:01,544 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:57:01,545 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 23:57:01,560 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:57:01,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:57:01,561 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:57:01,561 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:57:01,562 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:57:01,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:57:01,562 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:57:01,562 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:57:01,562 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:57:01,563 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:57:01,564 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:57:01,564 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:57:01,564 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:57:01,565 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:57:01,565 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:57:01,565 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:57:01,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:57:01,566 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:57:01,566 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:57:01,566 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:57:01,566 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:57:01,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:01,567 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:57:01,567 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:57:01,567 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 23:57:01,847 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:57:01,861 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:57:01,864 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:57:01,866 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:57:01,866 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:57:01,867 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 23:57:01,926 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e1f6124/3f59b5fced6e44dbb1ce5041791806a6/FLAG8ce990351 [2020-07-21 23:57:02,594 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:57:02,597 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 23:57:02,640 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e1f6124/3f59b5fced6e44dbb1ce5041791806a6/FLAG8ce990351 [2020-07-21 23:57:02,675 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59e1f6124/3f59b5fced6e44dbb1ce5041791806a6 [2020-07-21 23:57:02,689 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:57:02,693 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:57:02,699 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:57:02,700 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:57:02,706 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:57:02,707 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:57:02" (1/1) ... [2020-07-21 23:57:02,710 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@196f72ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:02, skipping insertion in model container [2020-07-21 23:57:02,711 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:57:02" (1/1) ... [2020-07-21 23:57:02,720 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:57:02,924 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:57:04,535 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:57:04,550 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:57:06,160 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:57:06,197 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:57:06,198 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06 WrapperNode [2020-07-21 23:57:06,198 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:57:06,199 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:57:06,199 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:57:06,199 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:57:06,215 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,283 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,283 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,389 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,411 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... [2020-07-21 23:57:06,441 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:57:06,443 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:57:06,443 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:57:06,444 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:57:06,445 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:57:06,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:57:06,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:57:06,520 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:57:06,521 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:57:06,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:57:06,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 23:57:06,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar [2020-07-21 23:57:06,522 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:57:06,522 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 23:57:06,522 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:57:06,522 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:57:06,523 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 23:57:06,523 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 23:57:06,523 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 23:57:06,523 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 23:57:06,524 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 23:57:06,524 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 23:57:06,524 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 23:57:06,524 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 23:57:06,525 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 23:57:06,525 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:57:06,525 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:57:06,525 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:57:10,701 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:57:10,701 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 23:57:10,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:57:10 BoogieIcfgContainer [2020-07-21 23:57:10,713 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:57:10,714 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:57:10,714 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:57:10,718 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:57:10,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:57:02" (1/3) ... [2020-07-21 23:57:10,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a605ce7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:57:10, skipping insertion in model container [2020-07-21 23:57:10,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:57:06" (2/3) ... [2020-07-21 23:57:10,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a605ce7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:57:10, skipping insertion in model container [2020-07-21 23:57:10,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:57:10" (3/3) ... [2020-07-21 23:57:10,721 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c [2020-07-21 23:57:10,732 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:57:10,741 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-21 23:57:10,755 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-21 23:57:10,785 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:57:10,785 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:57:10,786 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:57:10,786 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:57:10,786 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:57:10,786 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:57:10,786 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:57:10,787 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:57:10,830 INFO L276 IsEmpty]: Start isEmpty. Operand 1506 states. [2020-07-21 23:57:10,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-21 23:57:10,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:10,868 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:10,868 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:10,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:10,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1738290825, now seen corresponding path program 1 times [2020-07-21 23:57:10,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:10,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [513559006] [2020-07-21 23:57:10,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:11,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:11,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:11,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:57:11,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:12,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:12,129 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:12,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [513559006] [2020-07-21 23:57:12,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:12,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:57:12,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823844851] [2020-07-21 23:57:12,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:57:12,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:12,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:57:12,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:57:12,161 INFO L87 Difference]: Start difference. First operand 1506 states. Second operand 4 states. [2020-07-21 23:57:12,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:12,562 INFO L93 Difference]: Finished difference Result 4461 states and 8055 transitions. [2020-07-21 23:57:12,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 23:57:12,564 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 493 [2020-07-21 23:57:12,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:12,600 INFO L225 Difference]: With dead ends: 4461 [2020-07-21 23:57:12,600 INFO L226 Difference]: Without dead ends: 2962 [2020-07-21 23:57:12,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 490 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:57:12,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2962 states. [2020-07-21 23:57:12,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2962 to 2917. [2020-07-21 23:57:12,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2917 states. [2020-07-21 23:57:12,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2917 states to 2917 states and 4790 transitions. [2020-07-21 23:57:12,847 INFO L78 Accepts]: Start accepts. Automaton has 2917 states and 4790 transitions. Word has length 493 [2020-07-21 23:57:12,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:12,854 INFO L479 AbstractCegarLoop]: Abstraction has 2917 states and 4790 transitions. [2020-07-21 23:57:12,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:57:12,854 INFO L276 IsEmpty]: Start isEmpty. Operand 2917 states and 4790 transitions. [2020-07-21 23:57:12,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-21 23:57:12,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:12,881 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:13,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:13,095 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:13,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:13,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1745979400, now seen corresponding path program 1 times [2020-07-21 23:57:13,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:13,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011533859] [2020-07-21 23:57:13,097 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:13,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:13,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:13,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 2122 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:13,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:13,998 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:13,998 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:13,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011533859] [2020-07-21 23:57:13,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:14,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:14,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082356903] [2020-07-21 23:57:14,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:14,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:14,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:14,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:14,003 INFO L87 Difference]: Start difference. First operand 2917 states and 4790 transitions. Second operand 3 states. [2020-07-21 23:57:14,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:14,322 INFO L93 Difference]: Finished difference Result 8441 states and 13816 transitions. [2020-07-21 23:57:14,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:14,323 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 495 [2020-07-21 23:57:14,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:14,356 INFO L225 Difference]: With dead ends: 8441 [2020-07-21 23:57:14,356 INFO L226 Difference]: Without dead ends: 5753 [2020-07-21 23:57:14,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:14,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5753 states. [2020-07-21 23:57:14,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5753 to 5710. [2020-07-21 23:57:14,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5710 states. [2020-07-21 23:57:14,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5710 states to 5710 states and 9351 transitions. [2020-07-21 23:57:14,590 INFO L78 Accepts]: Start accepts. Automaton has 5710 states and 9351 transitions. Word has length 495 [2020-07-21 23:57:14,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:14,591 INFO L479 AbstractCegarLoop]: Abstraction has 5710 states and 9351 transitions. [2020-07-21 23:57:14,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:14,591 INFO L276 IsEmpty]: Start isEmpty. Operand 5710 states and 9351 transitions. [2020-07-21 23:57:14,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 23:57:14,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:14,611 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:14,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:14,825 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:14,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:14,826 INFO L82 PathProgramCache]: Analyzing trace with hash -2031538529, now seen corresponding path program 1 times [2020-07-21 23:57:14,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:14,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484680252] [2020-07-21 23:57:14,827 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:15,207 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:57:15,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:15,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 1739 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:15,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:15,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:15,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:15,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484680252] [2020-07-21 23:57:15,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:15,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:15,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113861862] [2020-07-21 23:57:15,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:15,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:15,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:15,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:15,424 INFO L87 Difference]: Start difference. First operand 5710 states and 9351 transitions. Second operand 3 states. [2020-07-21 23:57:15,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:15,730 INFO L93 Difference]: Finished difference Result 16874 states and 27590 transitions. [2020-07-21 23:57:15,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:15,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-21 23:57:15,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:15,786 INFO L225 Difference]: With dead ends: 16874 [2020-07-21 23:57:15,786 INFO L226 Difference]: Without dead ends: 11195 [2020-07-21 23:57:15,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:15,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11195 states. [2020-07-21 23:57:16,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11195 to 5736. [2020-07-21 23:57:16,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5736 states. [2020-07-21 23:57:16,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5736 states to 5736 states and 9389 transitions. [2020-07-21 23:57:16,138 INFO L78 Accepts]: Start accepts. Automaton has 5736 states and 9389 transitions. Word has length 496 [2020-07-21 23:57:16,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:16,138 INFO L479 AbstractCegarLoop]: Abstraction has 5736 states and 9389 transitions. [2020-07-21 23:57:16,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:16,139 INFO L276 IsEmpty]: Start isEmpty. Operand 5736 states and 9389 transitions. [2020-07-21 23:57:16,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-21 23:57:16,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:16,161 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:16,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:16,375 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:16,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:16,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1933455501, now seen corresponding path program 1 times [2020-07-21 23:57:16,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:16,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383696569] [2020-07-21 23:57:16,377 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:16,825 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:57:16,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:16,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:57:16,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:17,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:17,002 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:17,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383696569] [2020-07-21 23:57:17,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:17,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:57:17,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089367260] [2020-07-21 23:57:17,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:57:17,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:17,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:57:17,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:57:17,005 INFO L87 Difference]: Start difference. First operand 5736 states and 9389 transitions. Second operand 4 states. [2020-07-21 23:57:17,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:17,512 INFO L93 Difference]: Finished difference Result 13543 states and 22348 transitions. [2020-07-21 23:57:17,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:57:17,513 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 497 [2020-07-21 23:57:17,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:17,547 INFO L225 Difference]: With dead ends: 13543 [2020-07-21 23:57:17,547 INFO L226 Difference]: Without dead ends: 6868 [2020-07-21 23:57:17,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:57:17,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6868 states. [2020-07-21 23:57:18,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6868 to 6825. [2020-07-21 23:57:18,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6825 states. [2020-07-21 23:57:18,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6825 states to 6825 states and 11231 transitions. [2020-07-21 23:57:18,537 INFO L78 Accepts]: Start accepts. Automaton has 6825 states and 11231 transitions. Word has length 497 [2020-07-21 23:57:18,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:18,537 INFO L479 AbstractCegarLoop]: Abstraction has 6825 states and 11231 transitions. [2020-07-21 23:57:18,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:57:18,538 INFO L276 IsEmpty]: Start isEmpty. Operand 6825 states and 11231 transitions. [2020-07-21 23:57:18,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 23:57:18,559 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:18,560 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:18,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:18,773 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:18,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:18,774 INFO L82 PathProgramCache]: Analyzing trace with hash 791346258, now seen corresponding path program 1 times [2020-07-21 23:57:18,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:18,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498852929] [2020-07-21 23:57:18,775 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:19,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:19,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:19,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 2128 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:19,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:19,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:19,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:19,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498852929] [2020-07-21 23:57:19,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:19,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:19,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901104012] [2020-07-21 23:57:19,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:19,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:19,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:19,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:19,642 INFO L87 Difference]: Start difference. First operand 6825 states and 11231 transitions. Second operand 3 states. [2020-07-21 23:57:20,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:20,033 INFO L93 Difference]: Finished difference Result 12318 states and 19936 transitions. [2020-07-21 23:57:20,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:20,034 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 23:57:20,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:20,066 INFO L225 Difference]: With dead ends: 12318 [2020-07-21 23:57:20,069 INFO L226 Difference]: Without dead ends: 8731 [2020-07-21 23:57:20,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:20,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8731 states. [2020-07-21 23:57:20,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8731 to 7641. [2020-07-21 23:57:20,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7641 states. [2020-07-21 23:57:20,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7641 states to 7641 states and 12572 transitions. [2020-07-21 23:57:20,460 INFO L78 Accepts]: Start accepts. Automaton has 7641 states and 12572 transitions. Word has length 499 [2020-07-21 23:57:20,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:20,461 INFO L479 AbstractCegarLoop]: Abstraction has 7641 states and 12572 transitions. [2020-07-21 23:57:20,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:20,461 INFO L276 IsEmpty]: Start isEmpty. Operand 7641 states and 12572 transitions. [2020-07-21 23:57:20,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 23:57:20,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:20,479 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:20,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:20,693 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:20,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:20,694 INFO L82 PathProgramCache]: Analyzing trace with hash -160987480, now seen corresponding path program 1 times [2020-07-21 23:57:20,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:20,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382509210] [2020-07-21 23:57:20,695 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:21,124 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:21,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:21,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 2125 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:21,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:21,542 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:21,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382509210] [2020-07-21 23:57:21,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:21,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:21,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752118097] [2020-07-21 23:57:21,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:21,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:21,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:21,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:21,547 INFO L87 Difference]: Start difference. First operand 7641 states and 12572 transitions. Second operand 3 states. [2020-07-21 23:57:22,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:22,120 INFO L93 Difference]: Finished difference Result 22400 states and 36811 transitions. [2020-07-21 23:57:22,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:22,121 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 23:57:22,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:22,171 INFO L225 Difference]: With dead ends: 22400 [2020-07-21 23:57:22,172 INFO L226 Difference]: Without dead ends: 15135 [2020-07-21 23:57:22,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:22,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15135 states. [2020-07-21 23:57:22,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15135 to 15059. [2020-07-21 23:57:22,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15059 states. [2020-07-21 23:57:22,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15059 states to 15059 states and 24701 transitions. [2020-07-21 23:57:22,870 INFO L78 Accepts]: Start accepts. Automaton has 15059 states and 24701 transitions. Word has length 499 [2020-07-21 23:57:22,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:22,870 INFO L479 AbstractCegarLoop]: Abstraction has 15059 states and 24701 transitions. [2020-07-21 23:57:22,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:22,871 INFO L276 IsEmpty]: Start isEmpty. Operand 15059 states and 24701 transitions. [2020-07-21 23:57:22,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 23:57:22,904 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:22,905 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:23,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:23,121 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:23,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:23,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1312362157, now seen corresponding path program 1 times [2020-07-21 23:57:23,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:23,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085087577] [2020-07-21 23:57:23,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:23,506 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:57:23,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:23,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 1741 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:23,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:23,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:23,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:23,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085087577] [2020-07-21 23:57:23,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:23,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:23,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130885014] [2020-07-21 23:57:23,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:23,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:23,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:23,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:23,834 INFO L87 Difference]: Start difference. First operand 15059 states and 24701 transitions. Second operand 3 states. [2020-07-21 23:57:24,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:24,820 INFO L93 Difference]: Finished difference Result 44896 states and 73628 transitions. [2020-07-21 23:57:24,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:24,820 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 23:57:24,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:24,905 INFO L225 Difference]: With dead ends: 44896 [2020-07-21 23:57:24,906 INFO L226 Difference]: Without dead ends: 29974 [2020-07-21 23:57:24,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 497 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:25,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29974 states. [2020-07-21 23:57:25,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29974 to 15152. [2020-07-21 23:57:25,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15152 states. [2020-07-21 23:57:25,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15152 states to 15152 states and 24842 transitions. [2020-07-21 23:57:25,979 INFO L78 Accepts]: Start accepts. Automaton has 15152 states and 24842 transitions. Word has length 499 [2020-07-21 23:57:25,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:25,979 INFO L479 AbstractCegarLoop]: Abstraction has 15152 states and 24842 transitions. [2020-07-21 23:57:25,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:25,980 INFO L276 IsEmpty]: Start isEmpty. Operand 15152 states and 24842 transitions. [2020-07-21 23:57:26,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 23:57:26,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:26,006 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:26,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:26,221 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:26,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:26,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1131026839, now seen corresponding path program 1 times [2020-07-21 23:57:26,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:26,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85021838] [2020-07-21 23:57:26,222 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:26,588 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:57:26,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:26,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:26,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:26,758 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:26,758 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:26,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85021838] [2020-07-21 23:57:26,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:26,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:26,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436880484] [2020-07-21 23:57:26,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:26,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:26,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:26,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:26,765 INFO L87 Difference]: Start difference. First operand 15152 states and 24842 transitions. Second operand 3 states. [2020-07-21 23:57:27,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:27,532 INFO L93 Difference]: Finished difference Result 44512 states and 72932 transitions. [2020-07-21 23:57:27,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:27,532 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-21 23:57:27,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:27,606 INFO L225 Difference]: With dead ends: 44512 [2020-07-21 23:57:27,606 INFO L226 Difference]: Without dead ends: 29846 [2020-07-21 23:57:27,650 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 [2020-07-21 23:57:27,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29846 states. [2020-07-21 23:57:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29846 to 15304. [2020-07-21 23:57:28,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15304 states. [2020-07-21 23:57:28,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15304 states to 15304 states and 25066 transitions. [2020-07-21 23:57:28,485 INFO L78 Accepts]: Start accepts. Automaton has 15304 states and 25066 transitions. Word has length 500 [2020-07-21 23:57:28,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:28,486 INFO L479 AbstractCegarLoop]: Abstraction has 15304 states and 25066 transitions. [2020-07-21 23:57:28,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:28,486 INFO L276 IsEmpty]: Start isEmpty. Operand 15304 states and 25066 transitions. [2020-07-21 23:57:28,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 23:57:28,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:28,526 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:28,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:28,740 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:28,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:28,742 INFO L82 PathProgramCache]: Analyzing trace with hash -2123165756, now seen corresponding path program 1 times [2020-07-21 23:57:28,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:28,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763254728] [2020-07-21 23:57:28,744 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:29,715 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:57:29,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:29,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 1739 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:29,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:29,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:29,980 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:29,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763254728] [2020-07-21 23:57:29,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:29,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:29,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589134545] [2020-07-21 23:57:29,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:29,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:29,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:29,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:29,987 INFO L87 Difference]: Start difference. First operand 15304 states and 25066 transitions. Second operand 3 states. [2020-07-21 23:57:31,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:31,104 INFO L93 Difference]: Finished difference Result 45523 states and 74540 transitions. [2020-07-21 23:57:31,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:31,104 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-21 23:57:31,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:31,176 INFO L225 Difference]: With dead ends: 45523 [2020-07-21 23:57:31,177 INFO L226 Difference]: Without dead ends: 30410 [2020-07-21 23:57:31,209 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 [2020-07-21 23:57:31,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30410 states. [2020-07-21 23:57:32,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30410 to 15436. [2020-07-21 23:57:32,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15436 states. [2020-07-21 23:57:32,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15436 states to 15436 states and 25237 transitions. [2020-07-21 23:57:32,162 INFO L78 Accepts]: Start accepts. Automaton has 15436 states and 25237 transitions. Word has length 500 [2020-07-21 23:57:32,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:32,163 INFO L479 AbstractCegarLoop]: Abstraction has 15436 states and 25237 transitions. [2020-07-21 23:57:32,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:32,163 INFO L276 IsEmpty]: Start isEmpty. Operand 15436 states and 25237 transitions. [2020-07-21 23:57:32,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 23:57:32,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:32,183 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:32,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:32,398 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:32,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:32,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1141222616, now seen corresponding path program 1 times [2020-07-21 23:57:32,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:32,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113603222] [2020-07-21 23:57:32,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:32,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:32,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:32,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 2131 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:32,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:32,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:32,947 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:32,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113603222] [2020-07-21 23:57:32,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:32,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:32,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145695807] [2020-07-21 23:57:32,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:32,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:32,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:32,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:32,949 INFO L87 Difference]: Start difference. First operand 15436 states and 25237 transitions. Second operand 3 states. [2020-07-21 23:57:33,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:33,759 INFO L93 Difference]: Finished difference Result 28750 states and 46585 transitions. [2020-07-21 23:57:33,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:33,760 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-21 23:57:33,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:33,790 INFO L225 Difference]: With dead ends: 28750 [2020-07-21 23:57:33,790 INFO L226 Difference]: Without dead ends: 20438 [2020-07-21 23:57:33,804 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 [2020-07-21 23:57:33,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20438 states. [2020-07-21 23:57:34,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20438 to 18348. [2020-07-21 23:57:34,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18348 states. [2020-07-21 23:57:34,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18348 states to 18348 states and 30049 transitions. [2020-07-21 23:57:34,601 INFO L78 Accepts]: Start accepts. Automaton has 18348 states and 30049 transitions. Word has length 501 [2020-07-21 23:57:34,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:34,602 INFO L479 AbstractCegarLoop]: Abstraction has 18348 states and 30049 transitions. [2020-07-21 23:57:34,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:34,602 INFO L276 IsEmpty]: Start isEmpty. Operand 18348 states and 30049 transitions. [2020-07-21 23:57:34,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 23:57:34,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:34,619 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] [2020-07-21 23:57:34,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:34,820 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:34,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:34,821 INFO L82 PathProgramCache]: Analyzing trace with hash 56197873, now seen corresponding path program 1 times [2020-07-21 23:57:34,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:34,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054722974] [2020-07-21 23:57:34,822 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:35,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:35,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:35,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 2127 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:35,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:35,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:35,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:35,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054722974] [2020-07-21 23:57:35,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:35,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:35,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671302557] [2020-07-21 23:57:35,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:35,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:35,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:35,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:35,466 INFO L87 Difference]: Start difference. First operand 18348 states and 30049 transitions. Second operand 3 states. [2020-07-21 23:57:36,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:36,651 INFO L93 Difference]: Finished difference Result 52529 states and 85894 transitions. [2020-07-21 23:57:36,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:36,651 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 501 [2020-07-21 23:57:36,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:36,718 INFO L225 Difference]: With dead ends: 52529 [2020-07-21 23:57:36,719 INFO L226 Difference]: Without dead ends: 35725 [2020-07-21 23:57:36,758 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 [2020-07-21 23:57:36,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35725 states. [2020-07-21 23:57:38,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35725 to 35684. [2020-07-21 23:57:38,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35684 states. [2020-07-21 23:57:38,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35684 states to 35684 states and 58227 transitions. [2020-07-21 23:57:38,387 INFO L78 Accepts]: Start accepts. Automaton has 35684 states and 58227 transitions. Word has length 501 [2020-07-21 23:57:38,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:38,388 INFO L479 AbstractCegarLoop]: Abstraction has 35684 states and 58227 transitions. [2020-07-21 23:57:38,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:38,388 INFO L276 IsEmpty]: Start isEmpty. Operand 35684 states and 58227 transitions. [2020-07-21 23:57:38,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-21 23:57:38,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:38,413 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:38,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:38,628 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:38,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:38,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1807316952, now seen corresponding path program 1 times [2020-07-21 23:57:38,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:38,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27621728] [2020-07-21 23:57:38,630 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:39,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:39,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:39,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 2133 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:57:39,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:39,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:39,301 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:39,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27621728] [2020-07-21 23:57:39,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:39,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:57:39,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743303365] [2020-07-21 23:57:39,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:57:39,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:39,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:57:39,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:57:39,304 INFO L87 Difference]: Start difference. First operand 35684 states and 58227 transitions. Second operand 4 states. [2020-07-21 23:57:42,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:42,269 INFO L93 Difference]: Finished difference Result 103181 states and 168292 transitions. [2020-07-21 23:57:42,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:57:42,270 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 502 [2020-07-21 23:57:42,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:42,359 INFO L225 Difference]: With dead ends: 103181 [2020-07-21 23:57:42,359 INFO L226 Difference]: Without dead ends: 69145 [2020-07-21 23:57:42,412 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 [2020-07-21 23:57:42,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69145 states. [2020-07-21 23:57:45,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69145 to 69011. [2020-07-21 23:57:45,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69011 states. [2020-07-21 23:57:45,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69011 states to 69011 states and 112116 transitions. [2020-07-21 23:57:45,209 INFO L78 Accepts]: Start accepts. Automaton has 69011 states and 112116 transitions. Word has length 502 [2020-07-21 23:57:45,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:45,209 INFO L479 AbstractCegarLoop]: Abstraction has 69011 states and 112116 transitions. [2020-07-21 23:57:45,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:57:45,209 INFO L276 IsEmpty]: Start isEmpty. Operand 69011 states and 112116 transitions. [2020-07-21 23:57:45,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 23:57:45,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:45,269 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:45,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:45,484 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:45,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:45,485 INFO L82 PathProgramCache]: Analyzing trace with hash -816137863, now seen corresponding path program 1 times [2020-07-21 23:57:45,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:45,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268215469] [2020-07-21 23:57:45,486 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:45,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:57:45,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:57:45,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 2129 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:57:45,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:57:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:57:46,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:57:46,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268215469] [2020-07-21 23:57:46,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:57:46,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:57:46,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579800347] [2020-07-21 23:57:46,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:57:46,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:57:46,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:57:46,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:57:46,116 INFO L87 Difference]: Start difference. First operand 69011 states and 112116 transitions. Second operand 3 states. [2020-07-21 23:57:51,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:57:51,862 INFO L93 Difference]: Finished difference Result 200467 states and 325408 transitions. [2020-07-21 23:57:51,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:57:51,863 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 23:57:51,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:57:52,032 INFO L225 Difference]: With dead ends: 200467 [2020-07-21 23:57:52,033 INFO L226 Difference]: Without dead ends: 134581 [2020-07-21 23:57:52,091 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 [2020-07-21 23:57:52,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134581 states. [2020-07-21 23:57:59,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134581 to 134399. [2020-07-21 23:57:59,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134399 states. [2020-07-21 23:57:59,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134399 states to 134399 states and 217564 transitions. [2020-07-21 23:57:59,595 INFO L78 Accepts]: Start accepts. Automaton has 134399 states and 217564 transitions. Word has length 504 [2020-07-21 23:57:59,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:57:59,595 INFO L479 AbstractCegarLoop]: Abstraction has 134399 states and 217564 transitions. [2020-07-21 23:57:59,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:57:59,595 INFO L276 IsEmpty]: Start isEmpty. Operand 134399 states and 217564 transitions. [2020-07-21 23:57:59,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 23:57:59,674 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:57:59,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:57:59,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:57:59,875 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:57:59,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:57:59,876 INFO L82 PathProgramCache]: Analyzing trace with hash 626054159, now seen corresponding path program 1 times [2020-07-21 23:57:59,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:57:59,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978922434] [2020-07-21 23:57:59,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:00,251 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:58:00,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:00,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 1748 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:58:00,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:00,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:58:00,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:00,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978922434] [2020-07-21 23:58:00,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:00,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:58:00,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640382502] [2020-07-21 23:58:00,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:58:00,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:00,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:58:00,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:00,416 INFO L87 Difference]: Start difference. First operand 134399 states and 217564 transitions. Second operand 3 states. [2020-07-21 23:58:11,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:58:11,607 INFO L93 Difference]: Finished difference Result 397953 states and 643810 transitions. [2020-07-21 23:58:11,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:58:11,608 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 505 [2020-07-21 23:58:11,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:58:12,001 INFO L225 Difference]: With dead ends: 397953 [2020-07-21 23:58:12,001 INFO L226 Difference]: Without dead ends: 265679 [2020-07-21 23:58:12,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 503 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:12,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265679 states. [2020-07-21 23:58:21,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265679 to 134925. [2020-07-21 23:58:21,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134925 states. [2020-07-21 23:58:22,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134925 states to 134925 states and 218320 transitions. [2020-07-21 23:58:22,088 INFO L78 Accepts]: Start accepts. Automaton has 134925 states and 218320 transitions. Word has length 505 [2020-07-21 23:58:22,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:58:22,088 INFO L479 AbstractCegarLoop]: Abstraction has 134925 states and 218320 transitions. [2020-07-21 23:58:22,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:58:22,088 INFO L276 IsEmpty]: Start isEmpty. Operand 134925 states and 218320 transitions. [2020-07-21 23:58:22,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 23:58:22,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:58:22,176 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:58:22,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:22,377 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:58:22,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:58:22,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1051577625, now seen corresponding path program 1 times [2020-07-21 23:58:22,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:58:22,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873853261] [2020-07-21 23:58:22,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:22,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:58:22,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:22,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 1747 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:58:22,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:22,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:58:22,913 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:22,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873853261] [2020-07-21 23:58:22,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:22,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:58:22,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956981145] [2020-07-21 23:58:22,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:58:22,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:22,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:58:22,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:22,916 INFO L87 Difference]: Start difference. First operand 134925 states and 218320 transitions. Second operand 3 states. [2020-07-21 23:58:36,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:58:36,837 INFO L93 Difference]: Finished difference Result 399493 states and 646200 transitions. [2020-07-21 23:58:36,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:58:36,838 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 506 [2020-07-21 23:58:36,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:58:37,178 INFO L225 Difference]: With dead ends: 399493 [2020-07-21 23:58:37,178 INFO L226 Difference]: Without dead ends: 267159 [2020-07-21 23:58:37,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:37,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267159 states. [2020-07-21 23:58:43,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267159 to 135905. [2020-07-21 23:58:43,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135905 states. [2020-07-21 23:58:44,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135905 states to 135905 states and 219760 transitions. [2020-07-21 23:58:44,155 INFO L78 Accepts]: Start accepts. Automaton has 135905 states and 219760 transitions. Word has length 506 [2020-07-21 23:58:44,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:58:44,155 INFO L479 AbstractCegarLoop]: Abstraction has 135905 states and 219760 transitions. [2020-07-21 23:58:44,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:58:44,156 INFO L276 IsEmpty]: Start isEmpty. Operand 135905 states and 219760 transitions. [2020-07-21 23:58:44,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 23:58:44,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:58:44,242 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] [2020-07-21 23:58:44,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:44,443 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:58:44,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:58:44,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1404135771, now seen corresponding path program 1 times [2020-07-21 23:58:44,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:58:44,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615866343] [2020-07-21 23:58:44,444 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:58:44,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:58:44,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:58:44,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 1745 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:58:44,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:58:44,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:58:44,955 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:58:44,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615866343] [2020-07-21 23:58:44,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:58:44,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:58:44,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801872231] [2020-07-21 23:58:44,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:58:44,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:58:44,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:58:44,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:58:44,957 INFO L87 Difference]: Start difference. First operand 135905 states and 219760 transitions. Second operand 3 states. [2020-07-21 23:59:00,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:00,752 INFO L93 Difference]: Finished difference Result 401263 states and 648630 transitions. [2020-07-21 23:59:00,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:59:00,752 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 507 [2020-07-21 23:59:00,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:01,040 INFO L225 Difference]: With dead ends: 401263 [2020-07-21 23:59:01,040 INFO L226 Difference]: Without dead ends: 268719 [2020-07-21 23:59:01,144 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 [2020-07-21 23:59:01,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268719 states. [2020-07-21 23:59:08,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268719 to 137465. [2020-07-21 23:59:08,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137465 states. [2020-07-21 23:59:08,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137465 states to 137465 states and 221800 transitions. [2020-07-21 23:59:08,510 INFO L78 Accepts]: Start accepts. Automaton has 137465 states and 221800 transitions. Word has length 507 [2020-07-21 23:59:08,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:08,511 INFO L479 AbstractCegarLoop]: Abstraction has 137465 states and 221800 transitions. [2020-07-21 23:59:08,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:59:08,511 INFO L276 IsEmpty]: Start isEmpty. Operand 137465 states and 221800 transitions. [2020-07-21 23:59:08,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 509 [2020-07-21 23:59:08,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:08,605 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] [2020-07-21 23:59:08,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:08,806 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:08,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:08,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1466108367, now seen corresponding path program 1 times [2020-07-21 23:59:08,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:08,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026744601] [2020-07-21 23:59:08,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:09,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:09,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:09,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 1743 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:59:09,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:09,297 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:09,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026744601] [2020-07-21 23:59:09,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:09,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:59:09,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976480693] [2020-07-21 23:59:09,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:59:09,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:09,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:59:09,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:59:09,299 INFO L87 Difference]: Start difference. First operand 137465 states and 221800 transitions. Second operand 4 states. [2020-07-21 23:59:19,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:19,855 INFO L93 Difference]: Finished difference Result 294023 states and 476276 transitions. [2020-07-21 23:59:19,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:59:19,856 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 508 [2020-07-21 23:59:19,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:20,047 INFO L225 Difference]: With dead ends: 294023 [2020-07-21 23:59:20,047 INFO L226 Difference]: Without dead ends: 162179 [2020-07-21 23:59:20,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:59:20,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162179 states. [2020-07-21 23:59:27,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162179 to 139677. [2020-07-21 23:59:27,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139677 states. [2020-07-21 23:59:27,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139677 states to 139677 states and 225194 transitions. [2020-07-21 23:59:27,474 INFO L78 Accepts]: Start accepts. Automaton has 139677 states and 225194 transitions. Word has length 508 [2020-07-21 23:59:27,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:27,474 INFO L479 AbstractCegarLoop]: Abstraction has 139677 states and 225194 transitions. [2020-07-21 23:59:27,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:59:27,474 INFO L276 IsEmpty]: Start isEmpty. Operand 139677 states and 225194 transitions. [2020-07-21 23:59:27,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 23:59:27,559 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:27,559 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] [2020-07-21 23:59:27,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:27,760 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:27,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:27,761 INFO L82 PathProgramCache]: Analyzing trace with hash -645565231, now seen corresponding path program 1 times [2020-07-21 23:59:27,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:27,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722246401] [2020-07-21 23:59:27,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:28,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 23:59:28,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:28,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 1736 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 23:59:28,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:28,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:28,263 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:28,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722246401] [2020-07-21 23:59:28,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:28,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:59:28,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094101967] [2020-07-21 23:59:28,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:59:28,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:28,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:59:28,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:59:28,265 INFO L87 Difference]: Start difference. First operand 139677 states and 225194 transitions. Second operand 4 states. [2020-07-21 23:59:41,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:59:41,650 INFO L93 Difference]: Finished difference Result 321961 states and 521421 transitions. [2020-07-21 23:59:41,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:59:41,650 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 509 [2020-07-21 23:59:41,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:59:41,848 INFO L225 Difference]: With dead ends: 321961 [2020-07-21 23:59:41,848 INFO L226 Difference]: Without dead ends: 165585 [2020-07-21 23:59:41,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 506 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 23:59:42,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165585 states. [2020-07-21 23:59:49,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165585 to 165475. [2020-07-21 23:59:49,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165475 states. [2020-07-21 23:59:50,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165475 states to 165475 states and 266625 transitions. [2020-07-21 23:59:50,199 INFO L78 Accepts]: Start accepts. Automaton has 165475 states and 266625 transitions. Word has length 509 [2020-07-21 23:59:50,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:59:50,199 INFO L479 AbstractCegarLoop]: Abstraction has 165475 states and 266625 transitions. [2020-07-21 23:59:50,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:59:50,200 INFO L276 IsEmpty]: Start isEmpty. Operand 165475 states and 266625 transitions. [2020-07-21 23:59:50,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-21 23:59:50,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:59:50,321 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] [2020-07-21 23:59:50,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:50,533 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:59:50,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:59:50,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1759102675, now seen corresponding path program 1 times [2020-07-21 23:59:50,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:59:50,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704923560] [2020-07-21 23:59:50,535 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:59:50,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:59:50,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:59:50,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 2138 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 23:59:50,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:59:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:59:51,078 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:59:51,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704923560] [2020-07-21 23:59:51,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:59:51,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:59:51,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453693672] [2020-07-21 23:59:51,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:59:51,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:59:51,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:59:51,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:59:51,080 INFO L87 Difference]: Start difference. First operand 165475 states and 266625 transitions. Second operand 3 states. [2020-07-22 00:00:06,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:06,114 INFO L93 Difference]: Finished difference Result 305883 states and 491730 transitions. [2020-07-22 00:00:06,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:00:06,114 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 510 [2020-07-22 00:00:06,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:06,459 INFO L225 Difference]: With dead ends: 305883 [2020-07-22 00:00:06,459 INFO L226 Difference]: Without dead ends: 221205 [2020-07-22 00:00:06,597 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 [2020-07-22 00:00:06,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221205 states. [2020-07-22 00:00:17,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221205 to 206179. [2020-07-22 00:00:17,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206179 states. [2020-07-22 00:00:17,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206179 states to 206179 states and 333681 transitions. [2020-07-22 00:00:17,988 INFO L78 Accepts]: Start accepts. Automaton has 206179 states and 333681 transitions. Word has length 510 [2020-07-22 00:00:17,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:17,989 INFO L479 AbstractCegarLoop]: Abstraction has 206179 states and 333681 transitions. [2020-07-22 00:00:17,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:00:17,989 INFO L276 IsEmpty]: Start isEmpty. Operand 206179 states and 333681 transitions. [2020-07-22 00:00:18,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-22 00:00:18,162 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:18,162 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, 1] [2020-07-22 00:00:18,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:18,363 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:18,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:18,364 INFO L82 PathProgramCache]: Analyzing trace with hash -342264576, now seen corresponding path program 1 times [2020-07-22 00:00:18,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:18,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984737274] [2020-07-22 00:00:18,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:18,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:00:18,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:18,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:00:18,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:18,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:18,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:18,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984737274] [2020-07-22 00:00:18,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:18,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:00:18,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364132166] [2020-07-22 00:00:18,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:00:18,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:18,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:00:18,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:00:18,925 INFO L87 Difference]: Start difference. First operand 206179 states and 333681 transitions. Second operand 4 states. [2020-07-22 00:00:36,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:00:36,718 INFO L93 Difference]: Finished difference Result 469173 states and 761144 transitions. [2020-07-22 00:00:36,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:00:36,719 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 511 [2020-07-22 00:00:36,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:00:37,116 INFO L225 Difference]: With dead ends: 469173 [2020-07-22 00:00:37,117 INFO L226 Difference]: Without dead ends: 245614 [2020-07-22 00:00:37,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 508 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:00:37,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245614 states. [2020-07-22 00:00:56,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245614 to 245573. [2020-07-22 00:00:56,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245573 states. [2020-07-22 00:00:57,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245573 states to 245573 states and 396845 transitions. [2020-07-22 00:00:57,090 INFO L78 Accepts]: Start accepts. Automaton has 245573 states and 396845 transitions. Word has length 511 [2020-07-22 00:00:57,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:00:57,090 INFO L479 AbstractCegarLoop]: Abstraction has 245573 states and 396845 transitions. [2020-07-22 00:00:57,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:00:57,090 INFO L276 IsEmpty]: Start isEmpty. Operand 245573 states and 396845 transitions. [2020-07-22 00:00:57,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 513 [2020-07-22 00:00:57,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:00:57,259 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, 1, 1] [2020-07-22 00:00:57,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:57,468 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:00:57,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:00:57,469 INFO L82 PathProgramCache]: Analyzing trace with hash 662762928, now seen corresponding path program 1 times [2020-07-22 00:00:57,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:00:57,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204802359] [2020-07-22 00:00:57,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:00:57,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:00:57,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:00:57,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 1736 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:00:57,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:00:58,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:00:58,073 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:00:58,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204802359] [2020-07-22 00:00:58,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:00:58,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:00:58,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113235597] [2020-07-22 00:00:58,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:00:58,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:00:58,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:00:58,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:00:58,077 INFO L87 Difference]: Start difference. First operand 245573 states and 396845 transitions. Second operand 4 states. [2020-07-22 00:01:28,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:01:28,406 INFO L93 Difference]: Finished difference Result 695338 states and 1122497 transitions. [2020-07-22 00:01:28,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-22 00:01:28,407 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 512 [2020-07-22 00:01:28,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:01:29,135 INFO L225 Difference]: With dead ends: 695338 [2020-07-22 00:01:29,135 INFO L226 Difference]: Without dead ends: 453292 [2020-07-22 00:01:29,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 509 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:01:30,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453292 states. [2020-07-22 00:02:02,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453292 to 453259. [2020-07-22 00:02:02,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 453259 states. [2020-07-22 00:02:03,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453259 states to 453259 states and 727890 transitions. [2020-07-22 00:02:03,224 INFO L78 Accepts]: Start accepts. Automaton has 453259 states and 727890 transitions. Word has length 512 [2020-07-22 00:02:03,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:02:03,224 INFO L479 AbstractCegarLoop]: Abstraction has 453259 states and 727890 transitions. [2020-07-22 00:02:03,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:02:03,224 INFO L276 IsEmpty]: Start isEmpty. Operand 453259 states and 727890 transitions. [2020-07-22 00:02:04,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 514 [2020-07-22 00:02:04,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:02:04,582 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, 1, 1, 1] [2020-07-22 00:02:04,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:02:04,782 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:02:04,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:02:04,783 INFO L82 PathProgramCache]: Analyzing trace with hash -440131580, now seen corresponding path program 1 times [2020-07-22 00:02:04,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:02:04,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400145856] [2020-07-22 00:02:04,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:02:05,208 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:02:05,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:02:05,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 2142 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-22 00:02:05,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:02:05,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:02:05,400 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:02:05,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400145856] [2020-07-22 00:02:05,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:02:05,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-22 00:02:05,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661079080] [2020-07-22 00:02:05,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-22 00:02:05,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:02:05,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-22 00:02:05,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:02:05,403 INFO L87 Difference]: Start difference. First operand 453259 states and 727890 transitions. Second operand 3 states. [2020-07-22 00:02:54,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:02:54,675 INFO L93 Difference]: Finished difference Result 972436 states and 1549817 transitions. [2020-07-22 00:02:54,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-22 00:02:54,675 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 513 [2020-07-22 00:02:54,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:02:55,709 INFO L225 Difference]: With dead ends: 972436 [2020-07-22 00:02:55,710 INFO L226 Difference]: Without dead ends: 714427 [2020-07-22 00:02:55,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 511 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-22 00:02:56,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714427 states. [2020-07-22 00:03:58,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714427 to 713649. [2020-07-22 00:03:58,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 713649 states. [2020-07-22 00:03:59,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 713649 states to 713649 states and 1136771 transitions. [2020-07-22 00:03:59,565 INFO L78 Accepts]: Start accepts. Automaton has 713649 states and 1136771 transitions. Word has length 513 [2020-07-22 00:03:59,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:03:59,566 INFO L479 AbstractCegarLoop]: Abstraction has 713649 states and 1136771 transitions. [2020-07-22 00:03:59,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-22 00:03:59,566 INFO L276 IsEmpty]: Start isEmpty. Operand 713649 states and 1136771 transitions. [2020-07-22 00:04:00,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 514 [2020-07-22 00:04:00,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:04:00,014 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, 1, 1, 1] [2020-07-22 00:04:00,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:04:00,215 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:04:00,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:04:00,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1145739967, now seen corresponding path program 1 times [2020-07-22 00:04:00,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:04:00,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962898379] [2020-07-22 00:04:00,217 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:04:01,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:04:01,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:04:01,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 2141 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:04:01,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:04:02,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:04:02,208 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:04:02,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962898379] [2020-07-22 00:04:02,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:04:02,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-22 00:04:02,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319961786] [2020-07-22 00:04:02,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-22 00:04:02,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:04:02,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-22 00:04:02,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:04:02,210 INFO L87 Difference]: Start difference. First operand 713649 states and 1136771 transitions. Second operand 5 states. [2020-07-22 00:04:41,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:04:41,433 INFO L93 Difference]: Finished difference Result 949147 states and 1514181 transitions. [2020-07-22 00:04:41,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-22 00:04:41,434 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 513 [2020-07-22 00:04:41,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:04:42,823 INFO L225 Difference]: With dead ends: 949147 [2020-07-22 00:04:42,824 INFO L226 Difference]: Without dead ends: 453259 [2020-07-22 00:04:43,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 509 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-22 00:04:43,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453259 states. [2020-07-22 00:05:21,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453259 to 453259. [2020-07-22 00:05:21,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 453259 states. [2020-07-22 00:05:22,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453259 states to 453259 states and 725035 transitions. [2020-07-22 00:05:22,535 INFO L78 Accepts]: Start accepts. Automaton has 453259 states and 725035 transitions. Word has length 513 [2020-07-22 00:05:22,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:05:22,536 INFO L479 AbstractCegarLoop]: Abstraction has 453259 states and 725035 transitions. [2020-07-22 00:05:22,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-22 00:05:22,536 INFO L276 IsEmpty]: Start isEmpty. Operand 453259 states and 725035 transitions. [2020-07-22 00:05:23,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 514 [2020-07-22 00:05:23,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:05:23,752 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, 1, 1, 1] [2020-07-22 00:05:23,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:05:23,953 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:05:23,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:05:23,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1730665727, now seen corresponding path program 1 times [2020-07-22 00:05:23,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:05:23,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1538748910] [2020-07-22 00:05:23,956 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:05:24,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-22 00:05:24,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:05:24,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 2143 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-22 00:05:24,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:05:24,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:05:24,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:05:24,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1538748910] [2020-07-22 00:05:24,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:05:24,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:05:24,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291189758] [2020-07-22 00:05:24,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:05:24,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:05:24,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:05:24,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:05:24,617 INFO L87 Difference]: Start difference. First operand 453259 states and 725035 transitions. Second operand 4 states. [2020-07-22 00:06:29,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-22 00:06:29,368 INFO L93 Difference]: Finished difference Result 1347329 states and 2156569 transitions. [2020-07-22 00:06:29,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-22 00:06:29,369 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 513 [2020-07-22 00:06:29,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-22 00:06:30,873 INFO L225 Difference]: With dead ends: 1347329 [2020-07-22 00:06:30,873 INFO L226 Difference]: Without dead ends: 896525 [2020-07-22 00:06:31,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-22 00:06:32,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 896525 states. [2020-07-22 00:07:56,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 896525 to 895316. [2020-07-22 00:07:56,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 895316 states. [2020-07-22 00:07:59,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895316 states to 895316 states and 1427442 transitions. [2020-07-22 00:07:59,736 INFO L78 Accepts]: Start accepts. Automaton has 895316 states and 1427442 transitions. Word has length 513 [2020-07-22 00:07:59,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-22 00:07:59,736 INFO L479 AbstractCegarLoop]: Abstraction has 895316 states and 1427442 transitions. [2020-07-22 00:07:59,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-22 00:07:59,736 INFO L276 IsEmpty]: Start isEmpty. Operand 895316 states and 1427442 transitions. [2020-07-22 00:08:00,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 515 [2020-07-22 00:08:00,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-22 00:08:00,678 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, 1, 1, 1, 1] [2020-07-22 00:08:00,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:08:00,879 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-22 00:08:00,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-22 00:08:00,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1433545021, now seen corresponding path program 1 times [2020-07-22 00:08:00,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-22 00:08:00,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715602163] [2020-07-22 00:08:00,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-22 00:08:01,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-22 00:08:01,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-22 00:08:01,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 1752 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-22 00:08:01,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-22 00:08:02,779 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-22 00:08:02,779 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-22 00:08:02,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715602163] [2020-07-22 00:08:02,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-22 00:08:02,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-22 00:08:02,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824631136] [2020-07-22 00:08:02,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-22 00:08:02,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-22 00:08:02,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-22 00:08:02,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-22 00:08:02,781 INFO L87 Difference]: Start difference. First operand 895316 states and 1427442 transitions. Second operand 4 states.