/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_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 21:01:53,466 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 21:01:53,468 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 21:01:53,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 21:01:53,480 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 21:01:53,481 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 21:01:53,483 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 21:01:53,484 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 21:01:53,486 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 21:01:53,487 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 21:01:53,488 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 21:01:53,489 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 21:01:53,490 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 21:01:53,491 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 21:01:53,492 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 21:01:53,493 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 21:01:53,494 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 21:01:53,495 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 21:01:53,497 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 21:01:53,500 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 21:01:53,501 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 21:01:53,503 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 21:01:53,508 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 21:01:53,509 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 21:01:53,513 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 21:01:53,513 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 21:01:53,513 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 21:01:53,515 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 21:01:53,515 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 21:01:53,516 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 21:01:53,517 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 21:01:53,518 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 21:01:53,518 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 21:01:53,519 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 21:01:53,520 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 21:01:53,521 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 21:01:53,521 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 21:01:53,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 21:01:53,522 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 21:01:53,523 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 21:01:53,524 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 21:01:53,525 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 21:01:53,540 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 21:01:53,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 21:01:53,541 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 21:01:53,542 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 21:01:53,542 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 21:01:53,542 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 21:01:53,542 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 21:01:53,542 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 21:01:53,543 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 21:01:53,543 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 21:01:53,543 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 21:01:53,543 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 21:01:53,543 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 21:01:53,544 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 21:01:53,544 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 21:01:53,544 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 21:01:53,544 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 21:01:53,544 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 21:01:53,545 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 21:01:53,545 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 21:01:53,545 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 21:01:53,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 21:01:53,546 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 21:01:53,546 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 21:01:53,546 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 21:01:53,546 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 21:01:53,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:01:53,547 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 21:01:53,547 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 21:01:53,547 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 21:01:53,837 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 21:01:53,851 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 21:01:53,855 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 21:01:53,856 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 21:01:53,857 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 21:01:53,858 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:01:53,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f782a6af/fe718717481440dab4c51b718c1f71da/FLAGdf2d78bcf [2020-07-21 21:01:54,606 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 21:01:54,606 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:01:54,639 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f782a6af/fe718717481440dab4c51b718c1f71da/FLAGdf2d78bcf [2020-07-21 21:01:54,819 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1f782a6af/fe718717481440dab4c51b718c1f71da [2020-07-21 21:01:54,827 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 21:01:54,829 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 21:01:54,831 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 21:01:54,831 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 21:01:54,836 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 21:01:54,837 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:01:54" (1/1) ... [2020-07-21 21:01:54,840 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@729ac8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:54, skipping insertion in model container [2020-07-21 21:01:54,840 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 09:01:54" (1/1) ... [2020-07-21 21:01:54,849 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 21:01:55,019 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 21:01:56,420 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:01:56,435 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 21:01:57,437 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 21:01:57,477 INFO L208 MainTranslator]: Completed translation [2020-07-21 21:01:57,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57 WrapperNode [2020-07-21 21:01:57,478 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 21:01:57,479 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 21:01:57,479 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 21:01:57,479 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 21:01:57,494 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,548 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,549 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,648 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,661 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (1/1) ... [2020-07-21 21:01:57,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 21:01:57,680 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 21:01:57,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 21:01:57,682 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 21:01:57,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (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 21:01:57,767 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 21:01:57,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 21:01:57,768 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 21:01:57,768 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 21:01:57,769 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 21:01:57,769 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 21:01:57,770 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 21:01:57,770 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-21 21:01:57,770 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 21:01:57,771 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 21:01:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-21 21:01:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-21 21:01:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-21 21:01:57,772 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-21 21:01:57,773 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-21 21:01:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-21 21:01:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-07-21 21:01:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 21:01:57,774 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-21 21:01:57,775 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 21:01:57,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 21:01:57,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 21:02:01,501 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 21:02:01,501 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 21:02:01,521 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:02:01 BoogieIcfgContainer [2020-07-21 21:02:01,521 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 21:02:01,523 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 21:02:01,523 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 21:02:01,527 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 21:02:01,527 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 09:01:54" (1/3) ... [2020-07-21 21:02:01,528 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63250e56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:02:01, skipping insertion in model container [2020-07-21 21:02:01,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 09:01:57" (2/3) ... [2020-07-21 21:02:01,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@63250e56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 09:02:01, skipping insertion in model container [2020-07-21 21:02:01,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 09:02:01" (3/3) ... [2020-07-21 21:02:01,535 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c [2020-07-21 21:02:01,548 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 21:02:01,568 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 21:02:01,587 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 21:02:01,631 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 21:02:01,632 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 21:02:01,632 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 21:02:01,632 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 21:02:01,632 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 21:02:01,632 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 21:02:01,633 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 21:02:01,633 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 21:02:01,681 INFO L276 IsEmpty]: Start isEmpty. Operand 1322 states. [2020-07-21 21:02:01,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 21:02:01,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:01,734 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] [2020-07-21 21:02:01,735 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:01,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:01,742 INFO L82 PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times [2020-07-21 21:02:01,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:01,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674850915] [2020-07-21 21:02:01,752 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 21:02:02,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:02,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:02,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1634 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 21:02:02,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:02,806 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 21:02:02,806 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:02,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674850915] [2020-07-21 21:02:02,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:02,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:02,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535464403] [2020-07-21 21:02:02,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:02,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:02,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:02,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:02,835 INFO L87 Difference]: Start difference. First operand 1322 states. Second operand 3 states. [2020-07-21 21:02:03,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:03,165 INFO L93 Difference]: Finished difference Result 1763 states and 3140 transitions. [2020-07-21 21:02:03,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:03,167 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 467 [2020-07-21 21:02:03,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:03,197 INFO L225 Difference]: With dead ends: 1763 [2020-07-21 21:02:03,197 INFO L226 Difference]: Without dead ends: 1559 [2020-07-21 21:02:03,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 465 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 21:02:03,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1559 states. [2020-07-21 21:02:03,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1559 to 1557. [2020-07-21 21:02:03,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1557 states. [2020-07-21 21:02:03,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1557 states to 1557 states and 2577 transitions. [2020-07-21 21:02:03,356 INFO L78 Accepts]: Start accepts. Automaton has 1557 states and 2577 transitions. Word has length 467 [2020-07-21 21:02:03,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:03,357 INFO L479 AbstractCegarLoop]: Abstraction has 1557 states and 2577 transitions. [2020-07-21 21:02:03,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:03,358 INFO L276 IsEmpty]: Start isEmpty. Operand 1557 states and 2577 transitions. [2020-07-21 21:02:03,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 21:02:03,370 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:03,370 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] [2020-07-21 21:02:03,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:03,585 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:03,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:03,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times [2020-07-21 21:02:03,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:03,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570511287] [2020-07-21 21:02:03,588 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 21:02:04,086 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:04,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:04,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 1635 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:02:04,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:04,628 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 21:02:04,629 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:04,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570511287] [2020-07-21 21:02:04,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:04,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:02:04,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466608843] [2020-07-21 21:02:04,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:02:04,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:04,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:02:04,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:02:04,639 INFO L87 Difference]: Start difference. First operand 1557 states and 2577 transitions. Second operand 4 states. [2020-07-21 21:02:04,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:04,993 INFO L93 Difference]: Finished difference Result 4574 states and 7564 transitions. [2020-07-21 21:02:04,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:02:04,994 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 467 [2020-07-21 21:02:04,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:05,013 INFO L225 Difference]: With dead ends: 4574 [2020-07-21 21:02:05,014 INFO L226 Difference]: Without dead ends: 3058 [2020-07-21 21:02:05,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 464 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 21:02:05,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3058 states. [2020-07-21 21:02:05,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3058 to 3056. [2020-07-21 21:02:05,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3056 states. [2020-07-21 21:02:05,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3056 states to 3056 states and 5035 transitions. [2020-07-21 21:02:05,178 INFO L78 Accepts]: Start accepts. Automaton has 3056 states and 5035 transitions. Word has length 467 [2020-07-21 21:02:05,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:05,179 INFO L479 AbstractCegarLoop]: Abstraction has 3056 states and 5035 transitions. [2020-07-21 21:02:05,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:02:05,180 INFO L276 IsEmpty]: Start isEmpty. Operand 3056 states and 5035 transitions. [2020-07-21 21:02:05,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 21:02:05,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:05,191 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] [2020-07-21 21:02:05,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:05,405 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:05,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:05,406 INFO L82 PathProgramCache]: Analyzing trace with hash -112603437, now seen corresponding path program 1 times [2020-07-21 21:02:05,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:05,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261325237] [2020-07-21 21:02:05,407 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 21:02:05,752 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:05,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:05,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:05,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:05,977 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 21:02:05,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:05,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261325237] [2020-07-21 21:02:05,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:05,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:05,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213988867] [2020-07-21 21:02:05,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:05,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:05,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:05,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:05,981 INFO L87 Difference]: Start difference. First operand 3056 states and 5035 transitions. Second operand 3 states. [2020-07-21 21:02:06,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:06,330 INFO L93 Difference]: Finished difference Result 8821 states and 14487 transitions. [2020-07-21 21:02:06,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:06,331 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 469 [2020-07-21 21:02:06,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:06,370 INFO L225 Difference]: With dead ends: 8821 [2020-07-21 21:02:06,371 INFO L226 Difference]: Without dead ends: 5977 [2020-07-21 21:02:06,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 467 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 21:02:06,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5977 states. [2020-07-21 21:02:06,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5977 to 5975. [2020-07-21 21:02:06,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5975 states. [2020-07-21 21:02:06,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5975 states to 5975 states and 9800 transitions. [2020-07-21 21:02:06,762 INFO L78 Accepts]: Start accepts. Automaton has 5975 states and 9800 transitions. Word has length 469 [2020-07-21 21:02:06,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:06,763 INFO L479 AbstractCegarLoop]: Abstraction has 5975 states and 9800 transitions. [2020-07-21 21:02:06,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:06,763 INFO L276 IsEmpty]: Start isEmpty. Operand 5975 states and 9800 transitions. [2020-07-21 21:02:06,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-21 21:02:06,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:06,783 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] [2020-07-21 21:02:06,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:06,998 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:06,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:06,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1876984335, now seen corresponding path program 1 times [2020-07-21 21:02:06,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:07,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680746565] [2020-07-21 21:02:07,001 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 21:02:07,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:07,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:07,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 1636 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:07,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:07,572 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 21:02:07,573 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:07,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680746565] [2020-07-21 21:02:07,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:07,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:07,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750132083] [2020-07-21 21:02:07,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:07,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:07,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:07,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:07,576 INFO L87 Difference]: Start difference. First operand 5975 states and 9800 transitions. Second operand 3 states. [2020-07-21 21:02:08,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:08,129 INFO L93 Difference]: Finished difference Result 17633 states and 28870 transitions. [2020-07-21 21:02:08,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:08,130 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 470 [2020-07-21 21:02:08,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:08,189 INFO L225 Difference]: With dead ends: 17633 [2020-07-21 21:02:08,190 INFO L226 Difference]: Without dead ends: 11740 [2020-07-21 21:02:08,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 468 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 21:02:08,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11740 states. [2020-07-21 21:02:08,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11740 to 6003. [2020-07-21 21:02:08,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6003 states. [2020-07-21 21:02:08,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6003 states to 6003 states and 9840 transitions. [2020-07-21 21:02:08,575 INFO L78 Accepts]: Start accepts. Automaton has 6003 states and 9840 transitions. Word has length 470 [2020-07-21 21:02:08,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:08,576 INFO L479 AbstractCegarLoop]: Abstraction has 6003 states and 9840 transitions. [2020-07-21 21:02:08,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:08,576 INFO L276 IsEmpty]: Start isEmpty. Operand 6003 states and 9840 transitions. [2020-07-21 21:02:08,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2020-07-21 21:02:08,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:08,594 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] [2020-07-21 21:02:08,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:08,810 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:08,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:08,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1139279160, now seen corresponding path program 1 times [2020-07-21 21:02:08,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:08,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284575427] [2020-07-21 21:02:08,812 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 21:02:09,282 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:09,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:09,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:09,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:09,648 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 21:02:09,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:09,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284575427] [2020-07-21 21:02:09,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:09,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:09,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786030157] [2020-07-21 21:02:09,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:09,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:09,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:09,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:09,651 INFO L87 Difference]: Start difference. First operand 6003 states and 9840 transitions. Second operand 3 states. [2020-07-21 21:02:10,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:10,258 INFO L93 Difference]: Finished difference Result 17634 states and 28873 transitions. [2020-07-21 21:02:10,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:10,259 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 471 [2020-07-21 21:02:10,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:10,330 INFO L225 Difference]: With dead ends: 17634 [2020-07-21 21:02:10,330 INFO L226 Difference]: Without dead ends: 11860 [2020-07-21 21:02:10,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 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 21:02:10,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11860 states. [2020-07-21 21:02:11,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11860 to 11858. [2020-07-21 21:02:11,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11858 states. [2020-07-21 21:02:11,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11858 states to 11858 states and 19366 transitions. [2020-07-21 21:02:11,032 INFO L78 Accepts]: Start accepts. Automaton has 11858 states and 19366 transitions. Word has length 471 [2020-07-21 21:02:11,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:11,033 INFO L479 AbstractCegarLoop]: Abstraction has 11858 states and 19366 transitions. [2020-07-21 21:02:11,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:11,033 INFO L276 IsEmpty]: Start isEmpty. Operand 11858 states and 19366 transitions. [2020-07-21 21:02:11,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 472 [2020-07-21 21:02:11,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:11,061 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] [2020-07-21 21:02:11,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:11,275 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:11,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:11,276 INFO L82 PathProgramCache]: Analyzing trace with hash 245920979, now seen corresponding path program 1 times [2020-07-21 21:02:11,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:11,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624393444] [2020-07-21 21:02:11,276 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 21:02:11,658 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:11,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:11,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 1639 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:11,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:11,884 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 21:02:11,893 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:11,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624393444] [2020-07-21 21:02:11,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:11,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:11,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570148245] [2020-07-21 21:02:11,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:11,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:11,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:11,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:11,901 INFO L87 Difference]: Start difference. First operand 11858 states and 19366 transitions. Second operand 3 states. [2020-07-21 21:02:12,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:12,662 INFO L93 Difference]: Finished difference Result 35238 states and 57510 transitions. [2020-07-21 21:02:12,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:12,663 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 471 [2020-07-21 21:02:12,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:12,717 INFO L225 Difference]: With dead ends: 35238 [2020-07-21 21:02:12,717 INFO L226 Difference]: Without dead ends: 23542 [2020-07-21 21:02:12,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 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 21:02:12,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23542 states. [2020-07-21 21:02:14,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23542 to 11964. [2020-07-21 21:02:14,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11964 states. [2020-07-21 21:02:14,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11964 states to 11964 states and 19514 transitions. [2020-07-21 21:02:14,130 INFO L78 Accepts]: Start accepts. Automaton has 11964 states and 19514 transitions. Word has length 471 [2020-07-21 21:02:14,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:14,130 INFO L479 AbstractCegarLoop]: Abstraction has 11964 states and 19514 transitions. [2020-07-21 21:02:14,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:14,131 INFO L276 IsEmpty]: Start isEmpty. Operand 11964 states and 19514 transitions. [2020-07-21 21:02:14,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2020-07-21 21:02:14,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:14,157 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] [2020-07-21 21:02:14,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:14,371 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:14,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:14,372 INFO L82 PathProgramCache]: Analyzing trace with hash 826255240, now seen corresponding path program 1 times [2020-07-21 21:02:14,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:14,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152000890] [2020-07-21 21:02:14,373 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 21:02:14,761 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:14,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:14,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:14,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:14,894 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 21:02:14,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:14,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152000890] [2020-07-21 21:02:14,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:14,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:14,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505855565] [2020-07-21 21:02:14,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:14,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:14,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:14,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:14,898 INFO L87 Difference]: Start difference. First operand 11964 states and 19514 transitions. Second operand 3 states. [2020-07-21 21:02:15,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:15,737 INFO L93 Difference]: Finished difference Result 35432 states and 57772 transitions. [2020-07-21 21:02:15,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:15,738 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 472 [2020-07-21 21:02:15,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:15,799 INFO L225 Difference]: With dead ends: 35432 [2020-07-21 21:02:15,799 INFO L226 Difference]: Without dead ends: 23690 [2020-07-21 21:02:15,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 470 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 21:02:15,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23690 states. [2020-07-21 21:02:16,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23690 to 12112. [2020-07-21 21:02:16,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12112 states. [2020-07-21 21:02:16,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12112 states to 12112 states and 19714 transitions. [2020-07-21 21:02:16,514 INFO L78 Accepts]: Start accepts. Automaton has 12112 states and 19714 transitions. Word has length 472 [2020-07-21 21:02:16,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:16,515 INFO L479 AbstractCegarLoop]: Abstraction has 12112 states and 19714 transitions. [2020-07-21 21:02:16,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:16,515 INFO L276 IsEmpty]: Start isEmpty. Operand 12112 states and 19714 transitions. [2020-07-21 21:02:16,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-21 21:02:16,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:16,540 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] [2020-07-21 21:02:16,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:16,754 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:16,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:16,754 INFO L82 PathProgramCache]: Analyzing trace with hash -613978243, now seen corresponding path program 1 times [2020-07-21 21:02:16,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:16,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749094150] [2020-07-21 21:02:16,755 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 21:02:17,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:17,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:17,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:02:17,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:17,393 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 21:02:17,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:17,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749094150] [2020-07-21 21:02:17,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:17,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:02:17,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440785438] [2020-07-21 21:02:17,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:02:17,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:17,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:02:17,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:02:17,396 INFO L87 Difference]: Start difference. First operand 12112 states and 19714 transitions. Second operand 4 states. [2020-07-21 21:02:17,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:17,942 INFO L93 Difference]: Finished difference Result 26509 states and 43352 transitions. [2020-07-21 21:02:17,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:02:17,942 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 473 [2020-07-21 21:02:17,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:17,977 INFO L225 Difference]: With dead ends: 26509 [2020-07-21 21:02:17,978 INFO L226 Difference]: Without dead ends: 14412 [2020-07-21 21:02:18,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 470 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 21:02:18,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14412 states. [2020-07-21 21:02:18,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14412 to 12390. [2020-07-21 21:02:18,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12390 states. [2020-07-21 21:02:18,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12390 states to 12390 states and 20139 transitions. [2020-07-21 21:02:18,647 INFO L78 Accepts]: Start accepts. Automaton has 12390 states and 20139 transitions. Word has length 473 [2020-07-21 21:02:18,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:18,647 INFO L479 AbstractCegarLoop]: Abstraction has 12390 states and 20139 transitions. [2020-07-21 21:02:18,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:02:18,647 INFO L276 IsEmpty]: Start isEmpty. Operand 12390 states and 20139 transitions. [2020-07-21 21:02:18,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-21 21:02:18,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:18,667 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:18,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:18,881 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:18,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:18,882 INFO L82 PathProgramCache]: Analyzing trace with hash -960013676, now seen corresponding path program 1 times [2020-07-21 21:02:18,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:18,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604299877] [2020-07-21 21:02:18,883 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 21:02:19,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:19,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:19,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:19,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:19,486 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 21:02:19,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:19,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604299877] [2020-07-21 21:02:19,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:19,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:19,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237504001] [2020-07-21 21:02:19,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:19,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:19,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:19,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:19,490 INFO L87 Difference]: Start difference. First operand 12390 states and 20139 transitions. Second operand 3 states. [2020-07-21 21:02:20,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:20,248 INFO L93 Difference]: Finished difference Result 37066 states and 60231 transitions. [2020-07-21 21:02:20,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:20,248 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 476 [2020-07-21 21:02:20,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:20,298 INFO L225 Difference]: With dead ends: 37066 [2020-07-21 21:02:20,298 INFO L226 Difference]: Without dead ends: 24723 [2020-07-21 21:02:20,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 474 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 21:02:20,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24723 states. [2020-07-21 21:02:21,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24723 to 12440. [2020-07-21 21:02:21,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12440 states. [2020-07-21 21:02:21,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12440 states to 12440 states and 20212 transitions. [2020-07-21 21:02:21,173 INFO L78 Accepts]: Start accepts. Automaton has 12440 states and 20212 transitions. Word has length 476 [2020-07-21 21:02:21,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:21,173 INFO L479 AbstractCegarLoop]: Abstraction has 12440 states and 20212 transitions. [2020-07-21 21:02:21,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:21,173 INFO L276 IsEmpty]: Start isEmpty. Operand 12440 states and 20212 transitions. [2020-07-21 21:02:21,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-21 21:02:21,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:21,187 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] [2020-07-21 21:02:21,393 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:21,394 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:21,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:21,395 INFO L82 PathProgramCache]: Analyzing trace with hash -120817321, now seen corresponding path program 1 times [2020-07-21 21:02:21,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:21,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986869218] [2020-07-21 21:02:21,396 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 21:02:21,769 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:21,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:21,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:21,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:21,909 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 21:02:21,910 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:21,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986869218] [2020-07-21 21:02:21,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:21,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:21,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032726673] [2020-07-21 21:02:21,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:21,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:21,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:21,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:21,912 INFO L87 Difference]: Start difference. First operand 12440 states and 20212 transitions. Second operand 3 states. [2020-07-21 21:02:23,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:23,231 INFO L93 Difference]: Finished difference Result 37181 states and 60408 transitions. [2020-07-21 21:02:23,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:23,232 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 477 [2020-07-21 21:02:23,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:23,268 INFO L225 Difference]: With dead ends: 37181 [2020-07-21 21:02:23,268 INFO L226 Difference]: Without dead ends: 24794 [2020-07-21 21:02:23,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 475 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 21:02:23,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24794 states. [2020-07-21 21:02:24,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24794 to 12507. [2020-07-21 21:02:24,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12507 states. [2020-07-21 21:02:24,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12507 states to 12507 states and 20307 transitions. [2020-07-21 21:02:24,060 INFO L78 Accepts]: Start accepts. Automaton has 12507 states and 20307 transitions. Word has length 477 [2020-07-21 21:02:24,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:24,061 INFO L479 AbstractCegarLoop]: Abstraction has 12507 states and 20307 transitions. [2020-07-21 21:02:24,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:24,061 INFO L276 IsEmpty]: Start isEmpty. Operand 12507 states and 20307 transitions. [2020-07-21 21:02:24,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-21 21:02:24,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:24,073 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:24,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:24,279 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:24,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:24,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1329649522, now seen corresponding path program 1 times [2020-07-21 21:02:24,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:24,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715295047] [2020-07-21 21:02:24,281 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 21:02:24,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:24,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:24,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:24,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:24,790 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 21:02:24,790 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:24,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715295047] [2020-07-21 21:02:24,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:24,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:24,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201926126] [2020-07-21 21:02:24,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:24,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:24,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:24,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:24,793 INFO L87 Difference]: Start difference. First operand 12507 states and 20307 transitions. Second operand 3 states. [2020-07-21 21:02:26,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:26,054 INFO L93 Difference]: Finished difference Result 37313 states and 60587 transitions. [2020-07-21 21:02:26,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:26,054 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 478 [2020-07-21 21:02:26,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:26,090 INFO L225 Difference]: With dead ends: 37313 [2020-07-21 21:02:26,090 INFO L226 Difference]: Without dead ends: 24882 [2020-07-21 21:02:26,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 476 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:26,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24882 states. [2020-07-21 21:02:26,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24882 to 12599. [2020-07-21 21:02:26,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12599 states. [2020-07-21 21:02:26,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12599 states to 12599 states and 20433 transitions. [2020-07-21 21:02:26,752 INFO L78 Accepts]: Start accepts. Automaton has 12599 states and 20433 transitions. Word has length 478 [2020-07-21 21:02:26,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:26,753 INFO L479 AbstractCegarLoop]: Abstraction has 12599 states and 20433 transitions. [2020-07-21 21:02:26,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:26,753 INFO L276 IsEmpty]: Start isEmpty. Operand 12599 states and 20433 transitions. [2020-07-21 21:02:26,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 480 [2020-07-21 21:02:26,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:26,763 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:26,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:26,978 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:26,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:26,979 INFO L82 PathProgramCache]: Analyzing trace with hash -234986813, now seen corresponding path program 1 times [2020-07-21 21:02:26,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:26,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890923136] [2020-07-21 21:02:26,980 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 21:02:27,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:27,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:27,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:02:27,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:27,588 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 21:02:27,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:27,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890923136] [2020-07-21 21:02:27,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:27,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:02:27,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001019380] [2020-07-21 21:02:27,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:02:27,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:27,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:02:27,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:02:27,591 INFO L87 Difference]: Start difference. First operand 12599 states and 20433 transitions. Second operand 4 states. [2020-07-21 21:02:28,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:28,363 INFO L93 Difference]: Finished difference Result 28780 states and 47015 transitions. [2020-07-21 21:02:28,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:02:28,364 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 479 [2020-07-21 21:02:28,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:28,385 INFO L225 Difference]: With dead ends: 28780 [2020-07-21 21:02:28,385 INFO L226 Difference]: Without dead ends: 15137 [2020-07-21 21:02:28,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 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 21:02:28,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15137 states. [2020-07-21 21:02:29,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15137 to 15135. [2020-07-21 21:02:29,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15135 states. [2020-07-21 21:02:29,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15135 states to 15135 states and 24589 transitions. [2020-07-21 21:02:29,067 INFO L78 Accepts]: Start accepts. Automaton has 15135 states and 24589 transitions. Word has length 479 [2020-07-21 21:02:29,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:29,068 INFO L479 AbstractCegarLoop]: Abstraction has 15135 states and 24589 transitions. [2020-07-21 21:02:29,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:02:29,068 INFO L276 IsEmpty]: Start isEmpty. Operand 15135 states and 24589 transitions. [2020-07-21 21:02:29,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 482 [2020-07-21 21:02:29,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:29,080 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:29,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:29,281 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:29,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:29,281 INFO L82 PathProgramCache]: Analyzing trace with hash 263154430, now seen corresponding path program 1 times [2020-07-21 21:02:29,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:29,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786234851] [2020-07-21 21:02:29,283 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 21:02:29,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:29,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:29,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 1656 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:02:29,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:30,043 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 21:02:30,044 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:30,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786234851] [2020-07-21 21:02:30,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:30,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:02:30,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547803501] [2020-07-21 21:02:30,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:02:30,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:30,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:02:30,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:02:30,046 INFO L87 Difference]: Start difference. First operand 15135 states and 24589 transitions. Second operand 4 states. [2020-07-21 21:02:31,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:31,280 INFO L93 Difference]: Finished difference Result 43297 states and 70497 transitions. [2020-07-21 21:02:31,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:02:31,280 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 481 [2020-07-21 21:02:31,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:31,314 INFO L225 Difference]: With dead ends: 43297 [2020-07-21 21:02:31,314 INFO L226 Difference]: Without dead ends: 29695 [2020-07-21 21:02:31,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 478 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 21:02:31,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29695 states. [2020-07-21 21:02:32,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29695 to 29693. [2020-07-21 21:02:32,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29693 states. [2020-07-21 21:02:32,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29693 states to 29693 states and 48083 transitions. [2020-07-21 21:02:32,708 INFO L78 Accepts]: Start accepts. Automaton has 29693 states and 48083 transitions. Word has length 481 [2020-07-21 21:02:32,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:32,709 INFO L479 AbstractCegarLoop]: Abstraction has 29693 states and 48083 transitions. [2020-07-21 21:02:32,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:02:32,709 INFO L276 IsEmpty]: Start isEmpty. Operand 29693 states and 48083 transitions. [2020-07-21 21:02:32,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 484 [2020-07-21 21:02:32,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:32,735 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:32,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:32,943 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:32,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:32,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1063510114, now seen corresponding path program 1 times [2020-07-21 21:02:32,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:32,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882148421] [2020-07-21 21:02:32,945 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 21:02:33,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:33,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:33,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:33,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:33,496 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 21:02:33,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:33,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882148421] [2020-07-21 21:02:33,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:33,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:33,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159742404] [2020-07-21 21:02:33,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:33,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:33,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:33,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:33,499 INFO L87 Difference]: Start difference. First operand 29693 states and 48083 transitions. Second operand 3 states. [2020-07-21 21:02:35,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:35,939 INFO L93 Difference]: Finished difference Result 82382 states and 133468 transitions. [2020-07-21 21:02:35,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:35,939 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 483 [2020-07-21 21:02:35,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:36,002 INFO L225 Difference]: With dead ends: 82382 [2020-07-21 21:02:36,002 INFO L226 Difference]: Without dead ends: 56552 [2020-07-21 21:02:36,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 481 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:36,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56552 states. [2020-07-21 21:02:39,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56552 to 56550. [2020-07-21 21:02:39,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56550 states. [2020-07-21 21:02:39,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56550 states to 56550 states and 91306 transitions. [2020-07-21 21:02:39,523 INFO L78 Accepts]: Start accepts. Automaton has 56550 states and 91306 transitions. Word has length 483 [2020-07-21 21:02:39,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:39,524 INFO L479 AbstractCegarLoop]: Abstraction has 56550 states and 91306 transitions. [2020-07-21 21:02:39,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:39,524 INFO L276 IsEmpty]: Start isEmpty. Operand 56550 states and 91306 transitions. [2020-07-21 21:02:39,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 21:02:39,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:39,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:39,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:39,789 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:39,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:39,790 INFO L82 PathProgramCache]: Analyzing trace with hash 879645627, now seen corresponding path program 1 times [2020-07-21 21:02:39,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:39,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848592640] [2020-07-21 21:02:39,791 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 21:02:40,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:40,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:40,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 1657 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:40,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:40,585 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 21:02:40,585 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:40,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848592640] [2020-07-21 21:02:40,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:40,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:40,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596385812] [2020-07-21 21:02:40,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:40,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:40,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:40,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:40,588 INFO L87 Difference]: Start difference. First operand 56550 states and 91306 transitions. Second operand 3 states. [2020-07-21 21:02:45,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:45,625 INFO L93 Difference]: Finished difference Result 110883 states and 178760 transitions. [2020-07-21 21:02:45,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:45,625 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 484 [2020-07-21 21:02:45,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:45,707 INFO L225 Difference]: With dead ends: 110883 [2020-07-21 21:02:45,708 INFO L226 Difference]: Without dead ends: 83058 [2020-07-21 21:02:45,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:45,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83058 states. [2020-07-21 21:02:48,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83058 to 56122. [2020-07-21 21:02:48,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56122 states. [2020-07-21 21:02:48,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56122 states to 56122 states and 90641 transitions. [2020-07-21 21:02:48,568 INFO L78 Accepts]: Start accepts. Automaton has 56122 states and 90641 transitions. Word has length 484 [2020-07-21 21:02:48,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:48,568 INFO L479 AbstractCegarLoop]: Abstraction has 56122 states and 90641 transitions. [2020-07-21 21:02:48,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:48,568 INFO L276 IsEmpty]: Start isEmpty. Operand 56122 states and 90641 transitions. [2020-07-21 21:02:48,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2020-07-21 21:02:48,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:48,607 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:48,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:48,808 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:48,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:48,809 INFO L82 PathProgramCache]: Analyzing trace with hash -679371241, now seen corresponding path program 1 times [2020-07-21 21:02:48,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:48,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650826656] [2020-07-21 21:02:48,810 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 21:02:49,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:49,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:49,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 1646 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:49,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:49,306 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 21:02:49,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:49,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650826656] [2020-07-21 21:02:49,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:49,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:49,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481768073] [2020-07-21 21:02:49,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:49,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:49,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:49,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:49,309 INFO L87 Difference]: Start difference. First operand 56122 states and 90641 transitions. Second operand 3 states. [2020-07-21 21:02:55,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:02:55,588 INFO L93 Difference]: Finished difference Result 159518 states and 257343 transitions. [2020-07-21 21:02:55,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:02:55,589 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 484 [2020-07-21 21:02:55,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:02:55,699 INFO L225 Difference]: With dead ends: 159518 [2020-07-21 21:02:55,699 INFO L226 Difference]: Without dead ends: 107868 [2020-07-21 21:02:55,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:55,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107868 states. [2020-07-21 21:02:58,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107868 to 56618. [2020-07-21 21:02:58,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56618 states. [2020-07-21 21:02:58,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56618 states to 56618 states and 91319 transitions. [2020-07-21 21:02:58,821 INFO L78 Accepts]: Start accepts. Automaton has 56618 states and 91319 transitions. Word has length 484 [2020-07-21 21:02:58,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:02:58,821 INFO L479 AbstractCegarLoop]: Abstraction has 56618 states and 91319 transitions. [2020-07-21 21:02:58,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:02:58,821 INFO L276 IsEmpty]: Start isEmpty. Operand 56618 states and 91319 transitions. [2020-07-21 21:02:58,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 21:02:58,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:02:58,860 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:02:59,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:02:59,061 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:02:59,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:02:59,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1061486733, now seen corresponding path program 1 times [2020-07-21 21:02:59,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:02:59,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [310952648] [2020-07-21 21:02:59,063 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 21:02:59,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:02:59,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:02:59,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 1646 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:02:59,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:02:59,556 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 21:02:59,556 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:02:59,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [310952648] [2020-07-21 21:02:59,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:02:59,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:02:59,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493273171] [2020-07-21 21:02:59,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:02:59,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:02:59,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:02:59,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:02:59,559 INFO L87 Difference]: Start difference. First operand 56618 states and 91319 transitions. Second operand 3 states. [2020-07-21 21:03:06,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:06,112 INFO L93 Difference]: Finished difference Result 160822 states and 259242 transitions. [2020-07-21 21:03:06,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:03:06,112 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 21:03:06,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:06,225 INFO L225 Difference]: With dead ends: 160822 [2020-07-21 21:03:06,225 INFO L226 Difference]: Without dead ends: 108718 [2020-07-21 21:03:06,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:06,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108718 states. [2020-07-21 21:03:09,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108718 to 57292. [2020-07-21 21:03:09,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57292 states. [2020-07-21 21:03:09,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57292 states to 57292 states and 92197 transitions. [2020-07-21 21:03:09,535 INFO L78 Accepts]: Start accepts. Automaton has 57292 states and 92197 transitions. Word has length 485 [2020-07-21 21:03:09,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:09,535 INFO L479 AbstractCegarLoop]: Abstraction has 57292 states and 92197 transitions. [2020-07-21 21:03:09,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:03:09,535 INFO L276 IsEmpty]: Start isEmpty. Operand 57292 states and 92197 transitions. [2020-07-21 21:03:09,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 21:03:09,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:09,592 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:03:09,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:09,793 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:09,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:09,794 INFO L82 PathProgramCache]: Analyzing trace with hash -817784016, now seen corresponding path program 1 times [2020-07-21 21:03:09,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:09,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304441462] [2020-07-21 21:03:09,795 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 21:03:10,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:10,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:10,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 1648 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:03:10,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:10,274 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 21:03:10,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:10,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304441462] [2020-07-21 21:03:10,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:10,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:03:10,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138535892] [2020-07-21 21:03:10,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:03:10,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:10,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:03:10,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:10,277 INFO L87 Difference]: Start difference. First operand 57292 states and 92197 transitions. Second operand 3 states. [2020-07-21 21:03:15,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:15,944 INFO L93 Difference]: Finished difference Result 167183 states and 268935 transitions. [2020-07-21 21:03:15,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:03:15,945 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 485 [2020-07-21 21:03:15,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:16,063 INFO L225 Difference]: With dead ends: 167183 [2020-07-21 21:03:16,063 INFO L226 Difference]: Without dead ends: 110095 [2020-07-21 21:03:16,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:16,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110095 states. [2020-07-21 21:03:21,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110095 to 57234. [2020-07-21 21:03:21,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57234 states. [2020-07-21 21:03:21,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57234 states to 57234 states and 92093 transitions. [2020-07-21 21:03:21,931 INFO L78 Accepts]: Start accepts. Automaton has 57234 states and 92093 transitions. Word has length 485 [2020-07-21 21:03:21,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:21,931 INFO L479 AbstractCegarLoop]: Abstraction has 57234 states and 92093 transitions. [2020-07-21 21:03:21,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:03:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 57234 states and 92093 transitions. [2020-07-21 21:03:21,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 21:03:21,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:21,972 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:03:22,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:22,173 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:22,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1352989543, now seen corresponding path program 1 times [2020-07-21 21:03:22,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:22,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637240154] [2020-07-21 21:03:22,174 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 21:03:22,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:22,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:22,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 1658 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:03:22,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:22,747 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 21:03:22,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:22,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637240154] [2020-07-21 21:03:22,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:22,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:03:22,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102162742] [2020-07-21 21:03:22,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:03:22,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:22,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:03:22,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:03:22,750 INFO L87 Difference]: Start difference. First operand 57234 states and 92093 transitions. Second operand 4 states. [2020-07-21 21:03:28,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:28,974 INFO L93 Difference]: Finished difference Result 167170 states and 269331 transitions. [2020-07-21 21:03:28,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:03:28,975 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 485 [2020-07-21 21:03:28,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:29,091 INFO L225 Difference]: With dead ends: 167170 [2020-07-21 21:03:29,091 INFO L226 Difference]: Without dead ends: 111571 [2020-07-21 21:03:29,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 482 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 21:03:29,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111571 states. [2020-07-21 21:03:36,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111571 to 111301. [2020-07-21 21:03:36,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111301 states. [2020-07-21 21:03:36,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111301 states to 111301 states and 178476 transitions. [2020-07-21 21:03:36,388 INFO L78 Accepts]: Start accepts. Automaton has 111301 states and 178476 transitions. Word has length 485 [2020-07-21 21:03:36,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:36,388 INFO L479 AbstractCegarLoop]: Abstraction has 111301 states and 178476 transitions. [2020-07-21 21:03:36,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:03:36,388 INFO L276 IsEmpty]: Start isEmpty. Operand 111301 states and 178476 transitions. [2020-07-21 21:03:36,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 21:03:36,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:36,467 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:03:36,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:36,668 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:36,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:36,669 INFO L82 PathProgramCache]: Analyzing trace with hash -734544368, now seen corresponding path program 1 times [2020-07-21 21:03:36,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:36,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948414617] [2020-07-21 21:03:36,669 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:37,013 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:03:37,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:03:37,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 1648 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:03:37,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:03:37,135 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 21:03:37,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:03:37,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948414617] [2020-07-21 21:03:37,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:03:37,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:03:37,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319933195] [2020-07-21 21:03:37,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:03:37,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:03:37,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:03:37,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:37,138 INFO L87 Difference]: Start difference. First operand 111301 states and 178476 transitions. Second operand 3 states. [2020-07-21 21:03:51,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:03:51,412 INFO L93 Difference]: Finished difference Result 320149 states and 513106 transitions. [2020-07-21 21:03:51,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:03:51,413 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-21 21:03:51,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:03:51,642 INFO L225 Difference]: With dead ends: 320149 [2020-07-21 21:03:51,642 INFO L226 Difference]: Without dead ends: 215087 [2020-07-21 21:03:51,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:03:51,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215087 states. [2020-07-21 21:03:59,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215087 to 113405. [2020-07-21 21:03:59,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113405 states. [2020-07-21 21:03:59,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113405 states to 113405 states and 181300 transitions. [2020-07-21 21:03:59,678 INFO L78 Accepts]: Start accepts. Automaton has 113405 states and 181300 transitions. Word has length 487 [2020-07-21 21:03:59,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:03:59,678 INFO L479 AbstractCegarLoop]: Abstraction has 113405 states and 181300 transitions. [2020-07-21 21:03:59,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:03:59,678 INFO L276 IsEmpty]: Start isEmpty. Operand 113405 states and 181300 transitions. [2020-07-21 21:03:59,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 21:03:59,759 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:03:59,759 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 21:03:59,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:03:59,960 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:03:59,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:03:59,961 INFO L82 PathProgramCache]: Analyzing trace with hash 51944452, now seen corresponding path program 1 times [2020-07-21 21:03:59,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:03:59,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086110463] [2020-07-21 21:03:59,961 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:00,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:00,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:00,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 1651 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:00,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:00,509 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 21:04:00,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:00,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086110463] [2020-07-21 21:04:00,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:00,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:00,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355654953] [2020-07-21 21:04:00,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:00,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:00,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:00,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:00,511 INFO L87 Difference]: Start difference. First operand 113405 states and 181300 transitions. Second operand 3 states. [2020-07-21 21:04:15,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:04:15,568 INFO L93 Difference]: Finished difference Result 331207 states and 529630 transitions. [2020-07-21 21:04:15,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:04:15,568 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-21 21:04:15,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:04:16,128 INFO L225 Difference]: With dead ends: 331207 [2020-07-21 21:04:16,128 INFO L226 Difference]: Without dead ends: 222217 [2020-07-21 21:04:16,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:16,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222217 states. [2020-07-21 21:04:33,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222217 to 222215. [2020-07-21 21:04:33,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222215 states. [2020-07-21 21:04:34,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222215 states to 222215 states and 353948 transitions. [2020-07-21 21:04:34,093 INFO L78 Accepts]: Start accepts. Automaton has 222215 states and 353948 transitions. Word has length 487 [2020-07-21 21:04:34,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:04:34,093 INFO L479 AbstractCegarLoop]: Abstraction has 222215 states and 353948 transitions. [2020-07-21 21:04:34,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:04:34,093 INFO L276 IsEmpty]: Start isEmpty. Operand 222215 states and 353948 transitions. [2020-07-21 21:04:34,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 21:04:34,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:04:34,270 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 21:04:34,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:34,471 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:04:34,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:04:34,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1456513389, now seen corresponding path program 1 times [2020-07-21 21:04:34,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:04:34,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056533971] [2020-07-21 21:04:34,473 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:04:34,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:04:34,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:04:34,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 1659 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:04:34,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:04:35,558 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 21:04:35,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:04:35,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056533971] [2020-07-21 21:04:35,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:04:35,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:04:35,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328245997] [2020-07-21 21:04:35,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:04:35,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:04:35,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:04:35,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:04:35,560 INFO L87 Difference]: Start difference. First operand 222215 states and 353948 transitions. Second operand 3 states. [2020-07-21 21:05:06,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:05:06,797 INFO L93 Difference]: Finished difference Result 650331 states and 1035146 transitions. [2020-07-21 21:05:06,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:05:06,798 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 487 [2020-07-21 21:05:06,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:05:07,333 INFO L225 Difference]: With dead ends: 650331 [2020-07-21 21:05:07,333 INFO L226 Difference]: Without dead ends: 435393 [2020-07-21 21:05:07,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 485 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:07,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435393 states. [2020-07-21 21:05:48,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435393 to 434255. [2020-07-21 21:05:48,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434255 states. [2020-07-21 21:05:49,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434255 states to 434255 states and 688920 transitions. [2020-07-21 21:05:49,175 INFO L78 Accepts]: Start accepts. Automaton has 434255 states and 688920 transitions. Word has length 487 [2020-07-21 21:05:49,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:05:49,176 INFO L479 AbstractCegarLoop]: Abstraction has 434255 states and 688920 transitions. [2020-07-21 21:05:49,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:05:49,176 INFO L276 IsEmpty]: Start isEmpty. Operand 434255 states and 688920 transitions. [2020-07-21 21:05:50,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 21:05:50,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:05:50,238 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 21:05:50,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:50,448 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:05:50,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:05:50,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1337719059, now seen corresponding path program 1 times [2020-07-21 21:05:50,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:05:50,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591284715] [2020-07-21 21:05:50,451 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:05:50,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:05:50,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:05:50,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 1662 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 21:05:50,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:05:50,909 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 21:05:50,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:05:50,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591284715] [2020-07-21 21:05:50,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:05:50,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 21:05:50,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912418522] [2020-07-21 21:05:50,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 21:05:50,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:05:50,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 21:05:50,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:05:50,911 INFO L87 Difference]: Start difference. First operand 434255 states and 688920 transitions. Second operand 3 states. [2020-07-21 21:06:58,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:06:58,716 INFO L93 Difference]: Finished difference Result 1272981 states and 2018152 transitions. [2020-07-21 21:06:58,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 21:06:58,717 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 489 [2020-07-21 21:06:58,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:06:59,946 INFO L225 Difference]: With dead ends: 1272981 [2020-07-21 21:06:59,946 INFO L226 Difference]: Without dead ends: 840393 [2020-07-21 21:07:00,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 21:07:00,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 840393 states. [2020-07-21 21:07:46,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 840393 to 433083. [2020-07-21 21:07:46,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 433083 states. [2020-07-21 21:07:47,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433083 states to 433083 states and 686785 transitions. [2020-07-21 21:07:47,399 INFO L78 Accepts]: Start accepts. Automaton has 433083 states and 686785 transitions. Word has length 489 [2020-07-21 21:07:47,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:07:47,399 INFO L479 AbstractCegarLoop]: Abstraction has 433083 states and 686785 transitions. [2020-07-21 21:07:47,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 21:07:47,399 INFO L276 IsEmpty]: Start isEmpty. Operand 433083 states and 686785 transitions. [2020-07-21 21:07:47,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-21 21:07:47,826 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:07:47,826 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:07:48,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:07:48,027 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:07:48,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:07:48,028 INFO L82 PathProgramCache]: Analyzing trace with hash 233364911, now seen corresponding path program 1 times [2020-07-21 21:07:48,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:07:48,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [122611403] [2020-07-21 21:07:48,029 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:07:48,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:07:48,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:07:48,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 1661 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 21:07:48,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:07:48,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:07:48,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:07:48,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [122611403] [2020-07-21 21:07:48,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:07:48,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:07:48,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330471894] [2020-07-21 21:07:48,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:07:48,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:07:48,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:07:48,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:07:48,516 INFO L87 Difference]: Start difference. First operand 433083 states and 686785 transitions. Second operand 4 states. [2020-07-21 21:08:57,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:08:57,934 INFO L93 Difference]: Finished difference Result 1219675 states and 1930461 transitions. [2020-07-21 21:08:57,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:08:57,935 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 490 [2020-07-21 21:08:57,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:08:59,121 INFO L225 Difference]: With dead ends: 1219675 [2020-07-21 21:08:59,121 INFO L226 Difference]: Without dead ends: 847705 [2020-07-21 21:09:00,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:09:00,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847705 states. [2020-07-21 21:10:00,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847705 to 486111. [2020-07-21 21:10:00,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 486111 states. [2020-07-21 21:10:01,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486111 states to 486111 states and 773575 transitions. [2020-07-21 21:10:01,974 INFO L78 Accepts]: Start accepts. Automaton has 486111 states and 773575 transitions. Word has length 490 [2020-07-21 21:10:01,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:10:01,974 INFO L479 AbstractCegarLoop]: Abstraction has 486111 states and 773575 transitions. [2020-07-21 21:10:01,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:10:01,974 INFO L276 IsEmpty]: Start isEmpty. Operand 486111 states and 773575 transitions. [2020-07-21 21:10:02,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-21 21:10:02,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 21:10:02,465 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 21:10:02,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:10:02,666 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 21:10:02,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 21:10:02,667 INFO L82 PathProgramCache]: Analyzing trace with hash 821292396, now seen corresponding path program 1 times [2020-07-21 21:10:02,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 21:10:02,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119145103] [2020-07-21 21:10:02,668 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 21:10:03,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 21:10:03,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 21:10:03,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 1660 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 21:10:03,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 21:10:03,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 21:10:03,263 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 21:10:03,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119145103] [2020-07-21 21:10:03,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 21:10:03,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 21:10:03,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389320823] [2020-07-21 21:10:03,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 21:10:03,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 21:10:03,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 21:10:03,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 21:10:03,264 INFO L87 Difference]: Start difference. First operand 486111 states and 773575 transitions. Second operand 4 states. [2020-07-21 21:11:25,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 21:11:25,831 INFO L93 Difference]: Finished difference Result 1402963 states and 2232673 transitions. [2020-07-21 21:11:25,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 21:11:25,832 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 490 [2020-07-21 21:11:25,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 21:11:27,225 INFO L225 Difference]: With dead ends: 1402963 [2020-07-21 21:11:27,226 INFO L226 Difference]: Without dead ends: 948909 [2020-07-21 21:11:27,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 21:11:28,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 948909 states. [2020-07-21 21:13:13,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 948909 to 948859. [2020-07-21 21:13:13,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 948859 states. [2020-07-21 21:13:15,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 948859 states to 948859 states and 1503262 transitions. [2020-07-21 21:13:15,486 INFO L78 Accepts]: Start accepts. Automaton has 948859 states and 1503262 transitions. Word has length 490 [2020-07-21 21:13:15,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 21:13:15,487 INFO L479 AbstractCegarLoop]: Abstraction has 948859 states and 1503262 transitions. [2020-07-21 21:13:15,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 21:13:15,487 INFO L276 IsEmpty]: Start isEmpty. Operand 948859 states and 1503262 transitions.