/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 21:08:11,370 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 21:08:11,374 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 21:08:11,389 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 21:08:11,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 21:08:11,392 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 21:08:11,394 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 21:08:11,405 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 21:08:11,407 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 21:08:11,407 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 21:08:11,409 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 21:08:11,410 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 21:08:11,411 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 21:08:11,414 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 21:08:11,417 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 21:08:11,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 21:08:11,421 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 21:08:11,424 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 21:08:11,425 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 21:08:11,432 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 21:08:11,436 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 21:08:11,437 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 21:08:11,439 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 21:08:11,439 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 21:08:11,443 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 21:08:11,443 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 21:08:11,443 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 21:08:11,446 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 21:08:11,446 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 21:08:11,447 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 21:08:11,448 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 21:08:11,449 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 21:08:11,450 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 21:08:11,451 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 21:08:11,455 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 21:08:11,455 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 21:08:11,456 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 21:08:11,456 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 21:08:11,456 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 21:08:11,457 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 21:08:11,459 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 21:08:11,459 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 21:08:11,485 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 21:08:11,485 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 21:08:11,487 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 21:08:11,487 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 21:08:11,487 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 21:08:11,487 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 21:08:11,487 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 21:08:11,488 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 21:08:11,488 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 21:08:11,488 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 21:08:11,489 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 21:08:11,489 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 21:08:11,490 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 21:08:11,490 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 21:08:11,490 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 21:08:11,490 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 21:08:11,491 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 21:08:11,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 21:08:11,491 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 21:08:11,491 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 21:08:11,491 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 21:08:11,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:08:11,492 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 21:08:11,492 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 21:08:11,492 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 21:08:11,493 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 21:08:11,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:11,493 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 21:08:11,493 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 21:08:11,493 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 21:08:11,775 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 21:08:11,795 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 21:08:11,798 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 21:08:11,800 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 21:08:11,800 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 21:08:11,801 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:08:11,869 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ebd43c5f/ea049705b0c94ad6b9a13abd144b343c/FLAG349d16af1 [2020-07-21 21:08:12,532 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 21:08:12,533 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:08:12,563 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ebd43c5f/ea049705b0c94ad6b9a13abd144b343c/FLAG349d16af1 [2020-07-21 21:08:12,703 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ebd43c5f/ea049705b0c94ad6b9a13abd144b343c [2020-07-21 21:08:12,716 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 21:08:12,719 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 21:08:12,720 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 21:08:12,720 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 21:08:12,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 21:08:12,724 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:08:12" (1/1) ... [2020-07-21 21:08:12,727 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5da7f1fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:12, skipping insertion in model container [2020-07-21 21:08:12,727 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:08:12" (1/1) ... [2020-07-21 21:08:12,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 21:08:12,917 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 21:08:14,500 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:08:14,514 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 21:08:15,611 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:08:15,649 INFO L208 MainTranslator]: Completed translation [2020-07-21 21:08:15,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15 WrapperNode [2020-07-21 21:08:15,651 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 21:08:15,652 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 21:08:15,652 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 21:08:15,653 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 21:08:15,668 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,670 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,723 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,724 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,801 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,847 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,875 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (1/1) ... [2020-07-21 21:08:15,905 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 21:08:15,907 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 21:08:15,907 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 21:08:15,907 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 21:08:15,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (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 21:08:15,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 21:08:15,990 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 21:08:15,990 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 21:08:15,990 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 21:08:15,991 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 21:08:15,991 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 21:08:15,991 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 21:08:15,991 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 21:08:15,992 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 21:08:15,992 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 21:08:15,992 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 21:08:15,992 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 21:08:15,992 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 21:08:15,993 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 21:08:15,993 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 21:08:15,993 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 21:08:15,993 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 21:08:15,994 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 21:08:15,994 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 21:08:15,994 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 21:08:15,994 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 21:08:15,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 21:08:19,859 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 21:08:19,860 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 21:08:19,871 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:08:19 BoogieIcfgContainer [2020-07-21 21:08:19,871 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 21:08:19,873 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 21:08:19,873 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 21:08:19,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 21:08:19,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 09:08:12" (1/3) ... [2020-07-21 21:08:19,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15f188ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:08:19, skipping insertion in model container [2020-07-21 21:08:19,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:08:15" (2/3) ... [2020-07-21 21:08:19,877 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15f188ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:08:19, skipping insertion in model container [2020-07-21 21:08:19,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:08:19" (3/3) ... [2020-07-21 21:08:19,879 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:08:19,890 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 21:08:19,898 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 21:08:19,912 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 21:08:19,940 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 21:08:19,941 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 21:08:19,941 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 21:08:19,941 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 21:08:19,941 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 21:08:19,941 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 21:08:19,941 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 21:08:19,942 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 21:08:19,981 INFO L276 IsEmpty]: Start isEmpty. Operand 1431 states. [2020-07-21 21:08:20,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 21:08:20,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:20,017 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:08:20,017 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:20,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:20,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times [2020-07-21 21:08:20,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:20,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894428272] [2020-07-21 21:08:20,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:20,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:20,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:20,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 1724 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:08:20,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:21,187 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 21:08:21,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:21,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894428272] [2020-07-21 21:08:21,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:21,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:21,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528915807] [2020-07-21 21:08:21,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:21,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:21,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:21,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:21,214 INFO L87 Difference]: Start difference. First operand 1431 states. Second operand 4 states. [2020-07-21 21:08:21,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:21,698 INFO L93 Difference]: Finished difference Result 4236 states and 7632 transitions. [2020-07-21 21:08:21,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 21:08:21,700 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 487 [2020-07-21 21:08:21,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:21,736 INFO L225 Difference]: With dead ends: 4236 [2020-07-21 21:08:21,736 INFO L226 Difference]: Without dead ends: 2814 [2020-07-21 21:08:21,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 484 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 21:08:21,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2814 states. [2020-07-21 21:08:21,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812. [2020-07-21 21:08:21,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2812 states. [2020-07-21 21:08:21,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions. [2020-07-21 21:08:21,954 INFO L78 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487 [2020-07-21 21:08:21,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:21,958 INFO L479 AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions. [2020-07-21 21:08:21,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:21,958 INFO L276 IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions. [2020-07-21 21:08:21,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 21:08:21,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:21,978 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:08:22,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:22,193 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:22,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:22,194 INFO L82 PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times [2020-07-21 21:08:22,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:22,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576639933] [2020-07-21 21:08:22,195 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:22,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:22,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:22,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 1725 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:08:22,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:23,069 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 21:08:23,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:23,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576639933] [2020-07-21 21:08:23,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:23,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:23,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134480298] [2020-07-21 21:08:23,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:23,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:23,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:23,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:23,077 INFO L87 Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 4 states. [2020-07-21 21:08:23,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:23,493 INFO L93 Difference]: Finished difference Result 8344 states and 13766 transitions. [2020-07-21 21:08:23,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:23,493 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 489 [2020-07-21 21:08:23,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:23,529 INFO L225 Difference]: With dead ends: 8344 [2020-07-21 21:08:23,530 INFO L226 Difference]: Without dead ends: 5550 [2020-07-21 21:08:23,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 486 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 21:08:23,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5550 states. [2020-07-21 21:08:23,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5550 to 5548. [2020-07-21 21:08:23,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5548 states. [2020-07-21 21:08:23,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5548 states to 5548 states and 9114 transitions. [2020-07-21 21:08:23,803 INFO L78 Accepts]: Start accepts. Automaton has 5548 states and 9114 transitions. Word has length 489 [2020-07-21 21:08:23,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:23,804 INFO L479 AbstractCegarLoop]: Abstraction has 5548 states and 9114 transitions. [2020-07-21 21:08:23,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:23,804 INFO L276 IsEmpty]: Start isEmpty. Operand 5548 states and 9114 transitions. [2020-07-21 21:08:23,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 494 [2020-07-21 21:08:23,823 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:23,823 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 21:08:24,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:24,037 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:24,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:24,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1329199647, now seen corresponding path program 1 times [2020-07-21 21:08:24,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:24,039 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282324734] [2020-07-21 21:08:24,040 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:24,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:24,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:24,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 1728 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:08:24,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:24,750 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 21:08:24,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:24,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282324734] [2020-07-21 21:08:24,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:24,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:24,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584598454] [2020-07-21 21:08:24,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:24,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:24,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:24,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:24,754 INFO L87 Difference]: Start difference. First operand 5548 states and 9114 transitions. Second operand 4 states. [2020-07-21 21:08:25,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:25,336 INFO L93 Difference]: Finished difference Result 16469 states and 27051 transitions. [2020-07-21 21:08:25,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:25,337 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 493 [2020-07-21 21:08:25,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:25,390 INFO L225 Difference]: With dead ends: 16469 [2020-07-21 21:08:25,390 INFO L226 Difference]: Without dead ends: 10956 [2020-07-21 21:08:25,407 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 21:08:25,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10956 states. [2020-07-21 21:08:25,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10956 to 10954. [2020-07-21 21:08:25,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10954 states. [2020-07-21 21:08:25,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10954 states to 10954 states and 17915 transitions. [2020-07-21 21:08:25,935 INFO L78 Accepts]: Start accepts. Automaton has 10954 states and 17915 transitions. Word has length 493 [2020-07-21 21:08:25,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:25,936 INFO L479 AbstractCegarLoop]: Abstraction has 10954 states and 17915 transitions. [2020-07-21 21:08:25,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:25,936 INFO L276 IsEmpty]: Start isEmpty. Operand 10954 states and 17915 transitions. [2020-07-21 21:08:25,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2020-07-21 21:08:25,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:25,968 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 21:08:26,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:26,184 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:26,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:26,184 INFO L82 PathProgramCache]: Analyzing trace with hash 985173439, now seen corresponding path program 1 times [2020-07-21 21:08:26,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:26,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888597457] [2020-07-21 21:08:26,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:26,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:26,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:26,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 1735 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:08:26,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:26,761 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 21:08:26,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:26,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888597457] [2020-07-21 21:08:26,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:26,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:08:26,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948544572] [2020-07-21 21:08:26,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:08:26,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:26,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:08:26,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:08:26,765 INFO L87 Difference]: Start difference. First operand 10954 states and 17915 transitions. Second operand 3 states. [2020-07-21 21:08:27,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:27,340 INFO L93 Difference]: Finished difference Result 32723 states and 53518 transitions. [2020-07-21 21:08:27,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:08:27,340 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 496 [2020-07-21 21:08:27,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:27,432 INFO L225 Difference]: With dead ends: 32723 [2020-07-21 21:08:27,433 INFO L226 Difference]: Without dead ends: 21835 [2020-07-21 21:08:27,463 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 21:08:27,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21835 states. [2020-07-21 21:08:27,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21835 to 11017. [2020-07-21 21:08:27,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11017 states. [2020-07-21 21:08:28,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11017 states to 11017 states and 17999 transitions. [2020-07-21 21:08:28,050 INFO L78 Accepts]: Start accepts. Automaton has 11017 states and 17999 transitions. Word has length 496 [2020-07-21 21:08:28,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:28,050 INFO L479 AbstractCegarLoop]: Abstraction has 11017 states and 17999 transitions. [2020-07-21 21:08:28,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:08:28,051 INFO L276 IsEmpty]: Start isEmpty. Operand 11017 states and 17999 transitions. [2020-07-21 21:08:28,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-21 21:08:28,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:28,086 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 21:08:28,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:28,288 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:28,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:28,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1705424078, now seen corresponding path program 1 times [2020-07-21 21:08:28,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:28,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619973830] [2020-07-21 21:08:28,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:29,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:29,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:29,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 1744 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 21:08:29,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:29,520 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 21:08:29,520 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:29,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619973830] [2020-07-21 21:08:29,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:29,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 21:08:29,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76491862] [2020-07-21 21:08:29,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 21:08:29,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:29,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 21:08:29,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-21 21:08:29,523 INFO L87 Difference]: Start difference. First operand 11017 states and 17999 transitions. Second operand 9 states. [2020-07-21 21:08:39,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:39,531 INFO L93 Difference]: Finished difference Result 73603 states and 118484 transitions. [2020-07-21 21:08:39,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 21:08:39,532 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 497 [2020-07-21 21:08:39,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:39,698 INFO L225 Difference]: With dead ends: 73603 [2020-07-21 21:08:39,698 INFO L226 Difference]: Without dead ends: 71689 [2020-07-21 21:08:39,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 504 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 21:08:39,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71689 states. [2020-07-21 21:08:41,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71689 to 23377. [2020-07-21 21:08:41,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23377 states. [2020-07-21 21:08:41,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23377 states to 23377 states and 37635 transitions. [2020-07-21 21:08:41,380 INFO L78 Accepts]: Start accepts. Automaton has 23377 states and 37635 transitions. Word has length 497 [2020-07-21 21:08:41,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:41,381 INFO L479 AbstractCegarLoop]: Abstraction has 23377 states and 37635 transitions. [2020-07-21 21:08:41,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 21:08:41,381 INFO L276 IsEmpty]: Start isEmpty. Operand 23377 states and 37635 transitions. [2020-07-21 21:08:41,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-21 21:08:41,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:41,422 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 21:08:41,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:41,638 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:41,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:41,639 INFO L82 PathProgramCache]: Analyzing trace with hash -530811245, now seen corresponding path program 1 times [2020-07-21 21:08:41,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:41,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379923411] [2020-07-21 21:08:41,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:42,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:42,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:42,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 1738 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:08:42,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:42,408 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 21:08:42,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:42,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379923411] [2020-07-21 21:08:42,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:42,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:08:42,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748910999] [2020-07-21 21:08:42,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:08:42,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:42,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:08:42,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:08:42,411 INFO L87 Difference]: Start difference. First operand 23377 states and 37635 transitions. Second operand 3 states. [2020-07-21 21:08:44,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:44,476 INFO L93 Difference]: Finished difference Result 52657 states and 84345 transitions. [2020-07-21 21:08:44,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:08:44,477 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 497 [2020-07-21 21:08:44,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:44,571 INFO L225 Difference]: With dead ends: 52657 [2020-07-21 21:08:44,571 INFO L226 Difference]: Without dead ends: 33705 [2020-07-21 21:08:44,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 495 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 21:08:44,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33705 states. [2020-07-21 21:08:45,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33705 to 27719. [2020-07-21 21:08:45,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27719 states. [2020-07-21 21:08:45,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27719 states to 27719 states and 44857 transitions. [2020-07-21 21:08:45,621 INFO L78 Accepts]: Start accepts. Automaton has 27719 states and 44857 transitions. Word has length 497 [2020-07-21 21:08:45,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:45,621 INFO L479 AbstractCegarLoop]: Abstraction has 27719 states and 44857 transitions. [2020-07-21 21:08:45,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:08:45,622 INFO L276 IsEmpty]: Start isEmpty. Operand 27719 states and 44857 transitions. [2020-07-21 21:08:45,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 21:08:45,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:45,660 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 21:08:45,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:45,862 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:45,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:45,863 INFO L82 PathProgramCache]: Analyzing trace with hash 532673534, now seen corresponding path program 1 times [2020-07-21 21:08:45,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:45,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945714082] [2020-07-21 21:08:45,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:46,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:46,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:46,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:08:46,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:46,531 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 21:08:46,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:46,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945714082] [2020-07-21 21:08:46,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:46,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:46,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982393197] [2020-07-21 21:08:46,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:46,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:46,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:46,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:46,534 INFO L87 Difference]: Start difference. First operand 27719 states and 44857 transitions. Second operand 4 states. [2020-07-21 21:08:48,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:48,379 INFO L93 Difference]: Finished difference Result 81784 states and 132120 transitions. [2020-07-21 21:08:48,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:48,380 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 499 [2020-07-21 21:08:48,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:48,512 INFO L225 Difference]: With dead ends: 81784 [2020-07-21 21:08:48,512 INFO L226 Difference]: Without dead ends: 55352 [2020-07-21 21:08:48,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 496 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 21:08:48,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55352 states. [2020-07-21 21:08:50,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55352 to 29080. [2020-07-21 21:08:50,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29080 states. [2020-07-21 21:08:50,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29080 states to 29080 states and 47290 transitions. [2020-07-21 21:08:50,112 INFO L78 Accepts]: Start accepts. Automaton has 29080 states and 47290 transitions. Word has length 499 [2020-07-21 21:08:50,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:50,113 INFO L479 AbstractCegarLoop]: Abstraction has 29080 states and 47290 transitions. [2020-07-21 21:08:50,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:50,113 INFO L276 IsEmpty]: Start isEmpty. Operand 29080 states and 47290 transitions. [2020-07-21 21:08:50,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 21:08:50,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:50,133 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 21:08:50,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:50,341 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:50,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:50,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1583669253, now seen corresponding path program 1 times [2020-07-21 21:08:50,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:50,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875291534] [2020-07-21 21:08:50,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:50,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:08:50,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:50,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 1734 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:08:50,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:50,868 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 21:08:50,868 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:50,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875291534] [2020-07-21 21:08:50,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:50,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:08:50,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908079758] [2020-07-21 21:08:50,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:08:50,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:50,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:08:50,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:08:50,871 INFO L87 Difference]: Start difference. First operand 29080 states and 47290 transitions. Second operand 4 states. [2020-07-21 21:08:53,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:53,839 INFO L93 Difference]: Finished difference Result 84598 states and 137171 transitions. [2020-07-21 21:08:53,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:53,840 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 499 [2020-07-21 21:08:53,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:53,945 INFO L225 Difference]: With dead ends: 84598 [2020-07-21 21:08:53,945 INFO L226 Difference]: Without dead ends: 57950 [2020-07-21 21:08:54,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 496 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 21:08:54,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57950 states. [2020-07-21 21:08:55,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57950 to 31694. [2020-07-21 21:08:55,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31694 states. [2020-07-21 21:08:55,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31694 states to 31694 states and 51965 transitions. [2020-07-21 21:08:55,589 INFO L78 Accepts]: Start accepts. Automaton has 31694 states and 51965 transitions. Word has length 499 [2020-07-21 21:08:55,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:08:55,589 INFO L479 AbstractCegarLoop]: Abstraction has 31694 states and 51965 transitions. [2020-07-21 21:08:55,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:08:55,589 INFO L276 IsEmpty]: Start isEmpty. Operand 31694 states and 51965 transitions. [2020-07-21 21:08:55,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-21 21:08:55,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:08:55,612 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 21:08:55,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:08:55,826 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:08:55,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:08:55,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1016842434, now seen corresponding path program 1 times [2020-07-21 21:08:55,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:08:55,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649060122] [2020-07-21 21:08:55,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:08:56,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:08:56,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:08:56,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 3122 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:08:56,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:08:56,618 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 21:08:56,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:08:56,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649060122] [2020-07-21 21:08:56,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:08:56,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:08:56,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119538473] [2020-07-21 21:08:56,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:08:56,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:08:56,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:08:56,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:08:56,621 INFO L87 Difference]: Start difference. First operand 31694 states and 51965 transitions. Second operand 3 states. [2020-07-21 21:08:59,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:59,285 INFO L93 Difference]: Finished difference Result 90263 states and 147383 transitions. [2020-07-21 21:08:59,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:08:59,285 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 499 [2020-07-21 21:08:59,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:59,340 INFO L225 Difference]: With dead ends: 90263 [2020-07-21 21:08:59,341 INFO L226 Difference]: Without dead ends: 61119 [2020-07-21 21:08:59,366 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 21:08:59,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61119 states. [2020-07-21 21:09:03,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61119 to 61117. [2020-07-21 21:09:03,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61117 states. [2020-07-21 21:09:03,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61117 states to 61117 states and 99635 transitions. [2020-07-21 21:09:03,263 INFO L78 Accepts]: Start accepts. Automaton has 61117 states and 99635 transitions. Word has length 499 [2020-07-21 21:09:03,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:03,264 INFO L479 AbstractCegarLoop]: Abstraction has 61117 states and 99635 transitions. [2020-07-21 21:09:03,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:09:03,264 INFO L276 IsEmpty]: Start isEmpty. Operand 61117 states and 99635 transitions. [2020-07-21 21:09:03,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 21:09:03,312 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:03,312 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 21:09:03,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:03,522 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:03,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:03,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1200784840, now seen corresponding path program 1 times [2020-07-21 21:09:03,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:03,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686970084] [2020-07-21 21:09:03,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:09:04,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:09:04,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:04,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 3132 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 21:09:04,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:04,544 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 21:09:04,544 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:04,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686970084] [2020-07-21 21:09:04,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:04,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 21:09:04,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989131087] [2020-07-21 21:09:04,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 21:09:04,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:04,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 21:09:04,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 21:09:04,547 INFO L87 Difference]: Start difference. First operand 61117 states and 99635 transitions. Second operand 8 states. [2020-07-21 21:09:11,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:09:11,264 INFO L93 Difference]: Finished difference Result 97881 states and 159231 transitions. [2020-07-21 21:09:11,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 21:09:11,265 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 500 [2020-07-21 21:09:11,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:09:11,334 INFO L225 Difference]: With dead ends: 97881 [2020-07-21 21:09:11,334 INFO L226 Difference]: Without dead ends: 71047 [2020-07-21 21:09:11,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 21:09:11,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71047 states. [2020-07-21 21:09:13,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71047 to 35483. [2020-07-21 21:09:13,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35483 states. [2020-07-21 21:09:13,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35483 states to 35483 states and 58169 transitions. [2020-07-21 21:09:13,233 INFO L78 Accepts]: Start accepts. Automaton has 35483 states and 58169 transitions. Word has length 500 [2020-07-21 21:09:13,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:13,234 INFO L479 AbstractCegarLoop]: Abstraction has 35483 states and 58169 transitions. [2020-07-21 21:09:13,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 21:09:13,234 INFO L276 IsEmpty]: Start isEmpty. Operand 35483 states and 58169 transitions. [2020-07-21 21:09:13,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2020-07-21 21:09:13,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:13,259 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] [2020-07-21 21:09:13,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:13,461 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:13,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:13,462 INFO L82 PathProgramCache]: Analyzing trace with hash -383900535, now seen corresponding path program 1 times [2020-07-21 21:09:13,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:13,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081197643] [2020-07-21 21:09:13,463 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:09:14,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:09:14,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:14,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 3128 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:09:14,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:14,531 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 21:09:14,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:14,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081197643] [2020-07-21 21:09:14,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:14,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:09:14,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780417600] [2020-07-21 21:09:14,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:09:14,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:14,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:09:14,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:09:14,534 INFO L87 Difference]: Start difference. First operand 35483 states and 58169 transitions. Second operand 3 states. [2020-07-21 21:09:18,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:09:18,925 INFO L93 Difference]: Finished difference Result 95336 states and 154716 transitions. [2020-07-21 21:09:18,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:09:18,926 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 500 [2020-07-21 21:09:18,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:09:19,007 INFO L225 Difference]: With dead ends: 95336 [2020-07-21 21:09:19,007 INFO L226 Difference]: Without dead ends: 66434 [2020-07-21 21:09:19,037 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 21:09:19,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66434 states. [2020-07-21 21:09:22,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66434 to 66432. [2020-07-21 21:09:22,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66432 states. [2020-07-21 21:09:22,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66432 states to 66432 states and 108021 transitions. [2020-07-21 21:09:22,659 INFO L78 Accepts]: Start accepts. Automaton has 66432 states and 108021 transitions. Word has length 500 [2020-07-21 21:09:22,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:22,660 INFO L479 AbstractCegarLoop]: Abstraction has 66432 states and 108021 transitions. [2020-07-21 21:09:22,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:09:22,660 INFO L276 IsEmpty]: Start isEmpty. Operand 66432 states and 108021 transitions. [2020-07-21 21:09:22,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 21:09:22,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:22,706 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 21:09:22,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:22,907 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:22,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:22,908 INFO L82 PathProgramCache]: Analyzing trace with hash -121501563, now seen corresponding path program 1 times [2020-07-21 21:09:22,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:22,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273479791] [2020-07-21 21:09:22,909 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:09:23,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:09:23,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:23,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 1735 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:09:23,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:23,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:09:23,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:23,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273479791] [2020-07-21 21:09:23,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:23,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:09:23,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864923379] [2020-07-21 21:09:23,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:09:23,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:23,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:09:23,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:09:23,454 INFO L87 Difference]: Start difference. First operand 66432 states and 108021 transitions. Second operand 4 states. [2020-07-21 21:09:29,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:09:29,627 INFO L93 Difference]: Finished difference Result 149246 states and 242713 transitions. [2020-07-21 21:09:29,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:09:29,627 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-21 21:09:29,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:09:29,704 INFO L225 Difference]: With dead ends: 149246 [2020-07-21 21:09:29,705 INFO L226 Difference]: Without dead ends: 78631 [2020-07-21 21:09:29,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:09:29,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78631 states. [2020-07-21 21:09:33,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78631 to 78629. [2020-07-21 21:09:33,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78629 states. [2020-07-21 21:09:33,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78629 states to 78629 states and 127735 transitions. [2020-07-21 21:09:33,945 INFO L78 Accepts]: Start accepts. Automaton has 78629 states and 127735 transitions. Word has length 501 [2020-07-21 21:09:33,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:33,945 INFO L479 AbstractCegarLoop]: Abstraction has 78629 states and 127735 transitions. [2020-07-21 21:09:33,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:09:33,946 INFO L276 IsEmpty]: Start isEmpty. Operand 78629 states and 127735 transitions. [2020-07-21 21:09:34,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 21:09:34,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:34,008 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 21:09:34,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:34,210 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:34,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:34,211 INFO L82 PathProgramCache]: Analyzing trace with hash -994632166, now seen corresponding path program 1 times [2020-07-21 21:09:34,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:34,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043676811] [2020-07-21 21:09:34,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:09:34,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:09:34,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:34,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 21:09:34,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:35,421 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 21:09:35,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:35,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043676811] [2020-07-21 21:09:35,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:35,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 21:09:35,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075863506] [2020-07-21 21:09:35,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 21:09:35,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:35,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 21:09:35,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 21:09:35,423 INFO L87 Difference]: Start difference. First operand 78629 states and 127735 transitions. Second operand 8 states. [2020-07-21 21:09:48,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:09:48,140 INFO L93 Difference]: Finished difference Result 167659 states and 267825 transitions. [2020-07-21 21:09:48,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 21:09:48,141 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 501 [2020-07-21 21:09:48,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:09:48,271 INFO L225 Difference]: With dead ends: 167659 [2020-07-21 21:09:48,271 INFO L226 Difference]: Without dead ends: 128053 [2020-07-21 21:09:48,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-21 21:09:48,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128053 states. [2020-07-21 21:09:54,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128053 to 90193. [2020-07-21 21:09:54,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90193 states. [2020-07-21 21:09:54,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90193 states to 90193 states and 144583 transitions. [2020-07-21 21:09:54,272 INFO L78 Accepts]: Start accepts. Automaton has 90193 states and 144583 transitions. Word has length 501 [2020-07-21 21:09:54,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:09:54,273 INFO L479 AbstractCegarLoop]: Abstraction has 90193 states and 144583 transitions. [2020-07-21 21:09:54,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 21:09:54,273 INFO L276 IsEmpty]: Start isEmpty. Operand 90193 states and 144583 transitions. [2020-07-21 21:09:54,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-21 21:09:54,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:09:54,336 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 21:09:54,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:09:54,538 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:09:54,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:09:54,538 INFO L82 PathProgramCache]: Analyzing trace with hash -510984818, now seen corresponding path program 1 times [2020-07-21 21:09:54,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:09:54,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998653127] [2020-07-21 21:09:54,539 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:09:54,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:09:54,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:09:54,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 1741 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:09:54,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:09:55,191 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 21:09:55,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:09:55,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998653127] [2020-07-21 21:09:55,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:09:55,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:09:55,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426668919] [2020-07-21 21:09:55,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:09:55,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:09:55,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:09:55,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:09:55,193 INFO L87 Difference]: Start difference. First operand 90193 states and 144583 transitions. Second operand 4 states. [2020-07-21 21:10:08,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:10:08,626 INFO L93 Difference]: Finished difference Result 261421 states and 418222 transitions. [2020-07-21 21:10:08,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:10:08,626 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 501 [2020-07-21 21:10:08,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:10:08,812 INFO L225 Difference]: With dead ends: 261421 [2020-07-21 21:10:08,812 INFO L226 Difference]: Without dead ends: 173102 [2020-07-21 21:10:08,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:10:08,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173102 states. [2020-07-21 21:10:23,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173102 to 173100. [2020-07-21 21:10:23,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173100 states. [2020-07-21 21:10:23,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173100 states to 173100 states and 275656 transitions. [2020-07-21 21:10:23,345 INFO L78 Accepts]: Start accepts. Automaton has 173100 states and 275656 transitions. Word has length 501 [2020-07-21 21:10:23,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:10:23,345 INFO L479 AbstractCegarLoop]: Abstraction has 173100 states and 275656 transitions. [2020-07-21 21:10:23,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:10:23,346 INFO L276 IsEmpty]: Start isEmpty. Operand 173100 states and 275656 transitions. [2020-07-21 21:10:23,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 21:10:23,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:10:23,507 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 21:10:23,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:10:23,708 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:10:23,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:10:23,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1809354574, now seen corresponding path program 1 times [2020-07-21 21:10:23,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:10:23,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257111420] [2020-07-21 21:10:23,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:10:24,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:10:24,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:10:24,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 3134 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:10:24,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:10:24,687 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 21:10:24,687 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:10:24,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257111420] [2020-07-21 21:10:24,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:10:24,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 21:10:24,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043501141] [2020-07-21 21:10:24,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 21:10:24,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:10:24,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 21:10:24,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:10:24,689 INFO L87 Difference]: Start difference. First operand 173100 states and 275656 transitions. Second operand 5 states. [2020-07-21 21:10:46,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:10:46,624 INFO L93 Difference]: Finished difference Result 321237 states and 505286 transitions. [2020-07-21 21:10:46,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 21:10:46,624 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 504 [2020-07-21 21:10:46,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:10:46,918 INFO L225 Difference]: With dead ends: 321237 [2020-07-21 21:10:46,918 INFO L226 Difference]: Without dead ends: 274071 [2020-07-21 21:10:46,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 21:10:47,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274071 states. [2020-07-21 21:11:13,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274071 to 274069. [2020-07-21 21:11:13,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274069 states. [2020-07-21 21:11:13,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274069 states to 274069 states and 429578 transitions. [2020-07-21 21:11:13,880 INFO L78 Accepts]: Start accepts. Automaton has 274069 states and 429578 transitions. Word has length 504 [2020-07-21 21:11:13,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:11:13,881 INFO L479 AbstractCegarLoop]: Abstraction has 274069 states and 429578 transitions. [2020-07-21 21:11:13,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 21:11:13,881 INFO L276 IsEmpty]: Start isEmpty. Operand 274069 states and 429578 transitions. [2020-07-21 21:11:14,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 21:11:14,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:11:14,060 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 21:11:14,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:11:14,261 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:11:14,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:11:14,263 INFO L82 PathProgramCache]: Analyzing trace with hash 920557922, now seen corresponding path program 1 times [2020-07-21 21:11:14,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:11:14,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646588030] [2020-07-21 21:11:14,264 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:11:14,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:11:14,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:11:14,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 1741 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 21:11:14,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:11:15,591 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 21:11:15,592 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:11:15,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646588030] [2020-07-21 21:11:15,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:11:15,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:11:15,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472405037] [2020-07-21 21:11:15,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:11:15,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:11:15,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:11:15,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:11:15,594 INFO L87 Difference]: Start difference. First operand 274069 states and 429578 transitions. Second operand 3 states. [2020-07-21 21:11:48,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:11:48,545 INFO L93 Difference]: Finished difference Result 452901 states and 717092 transitions. [2020-07-21 21:11:48,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:11:48,545 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 21:11:48,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:11:48,984 INFO L225 Difference]: With dead ends: 452901 [2020-07-21 21:11:48,985 INFO L226 Difference]: Without dead ends: 365343 [2020-07-21 21:11:49,098 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 21:11:49,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365343 states. [2020-07-21 21:12:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365343 to 365341. [2020-07-21 21:12:27,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 365341 states. [2020-07-21 21:12:27,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365341 states to 365341 states and 574784 transitions. [2020-07-21 21:12:27,726 INFO L78 Accepts]: Start accepts. Automaton has 365341 states and 574784 transitions. Word has length 504 [2020-07-21 21:12:27,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:12:27,727 INFO L479 AbstractCegarLoop]: Abstraction has 365341 states and 574784 transitions. [2020-07-21 21:12:27,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:12:27,727 INFO L276 IsEmpty]: Start isEmpty. Operand 365341 states and 574784 transitions. [2020-07-21 21:12:27,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-21 21:12:27,925 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:12:27,926 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 21:12:28,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:12:28,132 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:12:28,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:12:28,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1963311401, now seen corresponding path program 1 times [2020-07-21 21:12:28,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:12:28,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089191182] [2020-07-21 21:12:28,134 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:12:28,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:12:28,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:12:28,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 3135 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:12:28,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:12:28,906 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 21:12:28,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:12:28,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089191182] [2020-07-21 21:12:28,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:12:28,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:12:28,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152082195] [2020-07-21 21:12:28,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:12:28,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:12:28,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:12:28,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:12:28,908 INFO L87 Difference]: Start difference. First operand 365341 states and 574784 transitions. Second operand 3 states. [2020-07-21 21:13:41,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:13:41,151 INFO L93 Difference]: Finished difference Result 1049815 states and 1645381 transitions. [2020-07-21 21:13:41,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:13:41,152 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 504 [2020-07-21 21:13:41,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:13:42,085 INFO L225 Difference]: With dead ends: 1049815 [2020-07-21 21:13:42,086 INFO L226 Difference]: Without dead ends: 710033 [2020-07-21 21:13:42,343 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 21:13:43,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710033 states. [2020-07-21 21:15:06,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710033 to 710031. [2020-07-21 21:15:06,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 710031 states. [2020-07-21 21:15:07,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 710031 states to 710031 states and 1111080 transitions. [2020-07-21 21:15:07,095 INFO L78 Accepts]: Start accepts. Automaton has 710031 states and 1111080 transitions. Word has length 504 [2020-07-21 21:15:07,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:15:07,096 INFO L479 AbstractCegarLoop]: Abstraction has 710031 states and 1111080 transitions. [2020-07-21 21:15:07,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:15:07,096 INFO L276 IsEmpty]: Start isEmpty. Operand 710031 states and 1111080 transitions. [2020-07-21 21:15:07,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 21:15:07,504 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:15:07,505 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 21:15:07,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:15:07,706 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:15:07,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:15:07,707 INFO L82 PathProgramCache]: Analyzing trace with hash 140733853, now seen corresponding path program 1 times [2020-07-21 21:15:07,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:15:07,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843193926] [2020-07-21 21:15:07,708 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:15:08,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:15:08,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:15:08,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 1744 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:15:08,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:15:09,473 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 21:15:09,473 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:15:09,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843193926] [2020-07-21 21:15:09,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:15:09,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:15:09,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905307317] [2020-07-21 21:15:09,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:15:09,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:15:09,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:15:09,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:15:09,483 INFO L87 Difference]: Start difference. First operand 710031 states and 1111080 transitions. Second operand 4 states. [2020-07-21 21:17:44,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:17:44,906 INFO L93 Difference]: Finished difference Result 2058875 states and 3212017 transitions. [2020-07-21 21:17:44,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:17:44,906 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 505 [2020-07-21 21:17:44,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:17:47,455 INFO L225 Difference]: With dead ends: 2058875 [2020-07-21 21:17:47,455 INFO L226 Difference]: Without dead ends: 1393053 [2020-07-21 21:17:47,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:17:48,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1393053 states. [2020-07-21 21:19:24,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1393053 to 754223. [2020-07-21 21:19:24,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 754223 states. [2020-07-21 21:19:25,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754223 states to 754223 states and 1184421 transitions. [2020-07-21 21:19:25,816 INFO L78 Accepts]: Start accepts. Automaton has 754223 states and 1184421 transitions. Word has length 505 [2020-07-21 21:19:25,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:19:25,816 INFO L479 AbstractCegarLoop]: Abstraction has 754223 states and 1184421 transitions. [2020-07-21 21:19:25,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:19:25,817 INFO L276 IsEmpty]: Start isEmpty. Operand 754223 states and 1184421 transitions. [2020-07-21 21:19:26,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 507 [2020-07-21 21:19:26,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:19:26,263 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 21:19:26,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:19:26,477 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:19:26,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:19:26,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1286477006, now seen corresponding path program 1 times [2020-07-21 21:19:26,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:19:26,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514049388] [2020-07-21 21:19:26,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 21:19:27,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 21:19:27,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:19:27,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 3147 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 21:19:27,059 INFO L286 TraceCheckSpWp]: Computing forward predicates...