/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 NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 18:28:54,512 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 18:28:54,515 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 18:28:54,527 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 18:28:54,527 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 18:28:54,528 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 18:28:54,529 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 18:28:54,531 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 18:28:54,533 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 18:28:54,534 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 18:28:54,535 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 18:28:54,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 18:28:54,536 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 18:28:54,537 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 18:28:54,538 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 18:28:54,539 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 18:28:54,540 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 18:28:54,541 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 18:28:54,543 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 18:28:54,544 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 18:28:54,546 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 18:28:54,547 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 18:28:54,548 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 18:28:54,549 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 18:28:54,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 18:28:54,551 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 18:28:54,551 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 18:28:54,552 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 18:28:54,553 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 18:28:54,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 18:28:54,554 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 18:28:54,555 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 18:28:54,555 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 18:28:54,556 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 18:28:54,557 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 18:28:54,557 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 18:28:54,558 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 18:28:54,558 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 18:28:54,558 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 18:28:54,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 18:28:54,560 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 18:28:54,561 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 18:28:54,587 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 18:28:54,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 18:28:54,589 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 18:28:54,589 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 18:28:54,589 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 18:28:54,590 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 18:28:54,590 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 18:28:54,590 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 18:28:54,590 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 18:28:54,590 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 18:28:54,591 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 18:28:54,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 18:28:54,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 18:28:54,591 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 18:28:54,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 18:28:54,592 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 18:28:54,593 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 18:28:54,593 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 18:28:54,593 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 18:28:54,593 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 18:28:54,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 18:28:54,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:28:54,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 18:28:54,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 18:28:54,595 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 18:28:54,595 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 18:28:54,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:28:54,595 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 18:28:54,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 18:28:54,596 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 -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 18:28:54,890 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 18:28:54,903 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 18:28:54,907 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 18:28:54,908 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 18:28:54,908 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 18:28:54,909 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-20 18:28:54,968 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/851af5ab7/3f2783b45dc8480f842379ef6fcc0237/FLAGd00971e7d [2020-07-20 18:28:55,593 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 18:28:55,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-20 18:28:55,621 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/851af5ab7/3f2783b45dc8480f842379ef6fcc0237/FLAGd00971e7d [2020-07-20 18:28:55,794 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/851af5ab7/3f2783b45dc8480f842379ef6fcc0237 [2020-07-20 18:28:55,804 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 18:28:55,807 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 18:28:55,809 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 18:28:55,809 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 18:28:55,812 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 18:28:55,814 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:28:55" (1/1) ... [2020-07-20 18:28:55,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d4cd0db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:55, skipping insertion in model container [2020-07-20 18:28:55,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:28:55" (1/1) ... [2020-07-20 18:28:55,825 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 18:28:55,928 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 18:28:56,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:28:57,001 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 18:28:57,550 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:28:57,572 INFO L208 MainTranslator]: Completed translation [2020-07-20 18:28:57,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57 WrapperNode [2020-07-20 18:28:57,573 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 18:28:57,574 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 18:28:57,574 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 18:28:57,574 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 18:28:57,593 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,594 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,622 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,623 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,684 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,716 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,731 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (1/1) ... [2020-07-20 18:28:57,753 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 18:28:57,755 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 18:28:57,756 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 18:28:57,756 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 18:28:57,757 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (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 [2020-07-20 18:28:57,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 18:28:57,864 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 18:28:57,865 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 18:28:57,865 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 18:28:57,865 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 18:28:57,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 18:28:57,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 18:28:57,867 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-07-20 18:28:57,867 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 18:28:57,867 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 18:28:57,868 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-07-20 18:28:57,869 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-07-20 18:28:57,869 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-07-20 18:28:57,869 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-07-20 18:28:57,869 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-07-20 18:28:57,870 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-07-20 18:28:57,871 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 18:28:57,871 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 18:28:57,871 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 18:28:57,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 18:28:57,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 18:29:00,761 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 18:29:00,761 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 18:29:00,775 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:29:00 BoogieIcfgContainer [2020-07-20 18:29:00,775 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 18:29:00,777 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 18:29:00,777 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 18:29:00,781 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 18:29:00,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:28:55" (1/3) ... [2020-07-20 18:29:00,782 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5144fb8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:29:00, skipping insertion in model container [2020-07-20 18:29:00,782 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:28:57" (2/3) ... [2020-07-20 18:29:00,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5144fb8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:29:00, skipping insertion in model container [2020-07-20 18:29:00,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:29:00" (3/3) ... [2020-07-20 18:29:00,785 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.3.ufo.BOUNDED-8.pals.c.v+nlh-reducer.c [2020-07-20 18:29:00,796 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 18:29:00,808 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 18:29:00,822 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 18:29:00,850 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 18:29:00,850 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 18:29:00,850 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 18:29:00,850 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 18:29:00,851 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 18:29:00,851 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 18:29:00,851 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 18:29:00,851 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 18:29:00,884 INFO L276 IsEmpty]: Start isEmpty. Operand 795 states. [2020-07-20 18:29:00,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2020-07-20 18:29:00,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:00,917 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:00,917 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:00,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:00,923 INFO L82 PathProgramCache]: Analyzing trace with hash -2046950044, now seen corresponding path program 1 times [2020-07-20 18:29:00,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:00,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056405226] [2020-07-20 18:29:00,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:01,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:01,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:01,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 1959 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:01,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:01,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:01,868 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:01,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056405226] [2020-07-20 18:29:01,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:01,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:01,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166365292] [2020-07-20 18:29:01,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:01,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:01,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:01,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:01,895 INFO L87 Difference]: Start difference. First operand 795 states. Second operand 4 states. [2020-07-20 18:29:02,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:02,264 INFO L93 Difference]: Finished difference Result 2311 states and 4106 transitions. [2020-07-20 18:29:02,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 18:29:02,266 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 324 [2020-07-20 18:29:02,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:02,291 INFO L225 Difference]: With dead ends: 2311 [2020-07-20 18:29:02,292 INFO L226 Difference]: Without dead ends: 1535 [2020-07-20 18:29:02,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:02,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1535 states. [2020-07-20 18:29:02,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1535 to 1533. [2020-07-20 18:29:02,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1533 states. [2020-07-20 18:29:02,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1533 states to 1533 states and 2382 transitions. [2020-07-20 18:29:02,451 INFO L78 Accepts]: Start accepts. Automaton has 1533 states and 2382 transitions. Word has length 324 [2020-07-20 18:29:02,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:02,454 INFO L479 AbstractCegarLoop]: Abstraction has 1533 states and 2382 transitions. [2020-07-20 18:29:02,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:02,454 INFO L276 IsEmpty]: Start isEmpty. Operand 1533 states and 2382 transitions. [2020-07-20 18:29:02,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-20 18:29:02,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:02,467 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] [2020-07-20 18:29:02,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:02,679 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:02,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:02,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1039151531, now seen corresponding path program 1 times [2020-07-20 18:29:02,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:02,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213805049] [2020-07-20 18:29:02,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:03,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:03,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:03,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 1963 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:03,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:03,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:03,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:03,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213805049] [2020-07-20 18:29:03,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:03,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:03,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597418709] [2020-07-20 18:29:03,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:03,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:03,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:03,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:03,307 INFO L87 Difference]: Start difference. First operand 1533 states and 2382 transitions. Second operand 3 states. [2020-07-20 18:29:03,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:03,484 INFO L93 Difference]: Finished difference Result 4371 states and 6753 transitions. [2020-07-20 18:29:03,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:03,485 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-20 18:29:03,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:03,501 INFO L225 Difference]: With dead ends: 4371 [2020-07-20 18:29:03,502 INFO L226 Difference]: Without dead ends: 2965 [2020-07-20 18:29:03,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:03,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2965 states. [2020-07-20 18:29:03,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2965 to 2963. [2020-07-20 18:29:03,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2963 states. [2020-07-20 18:29:03,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2963 states to 2963 states and 4572 transitions. [2020-07-20 18:29:03,627 INFO L78 Accepts]: Start accepts. Automaton has 2963 states and 4572 transitions. Word has length 326 [2020-07-20 18:29:03,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:03,628 INFO L479 AbstractCegarLoop]: Abstraction has 2963 states and 4572 transitions. [2020-07-20 18:29:03,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:03,628 INFO L276 IsEmpty]: Start isEmpty. Operand 2963 states and 4572 transitions. [2020-07-20 18:29:03,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-07-20 18:29:03,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:03,639 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:03,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:03,854 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:03,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:03,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1642540496, now seen corresponding path program 1 times [2020-07-20 18:29:03,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:03,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994454094] [2020-07-20 18:29:03,855 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:04,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:04,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:04,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:04,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:04,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:04,234 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:04,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994454094] [2020-07-20 18:29:04,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:04,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:04,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112047272] [2020-07-20 18:29:04,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:04,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:04,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:04,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:04,237 INFO L87 Difference]: Start difference. First operand 2963 states and 4572 transitions. Second operand 3 states. [2020-07-20 18:29:04,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:04,429 INFO L93 Difference]: Finished difference Result 8707 states and 13399 transitions. [2020-07-20 18:29:04,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:04,430 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 326 [2020-07-20 18:29:04,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:04,460 INFO L225 Difference]: With dead ends: 8707 [2020-07-20 18:29:04,461 INFO L226 Difference]: Without dead ends: 5838 [2020-07-20 18:29:04,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:04,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5838 states. [2020-07-20 18:29:04,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5838 to 2976. [2020-07-20 18:29:04,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2976 states. [2020-07-20 18:29:04,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2976 states to 2976 states and 4588 transitions. [2020-07-20 18:29:04,698 INFO L78 Accepts]: Start accepts. Automaton has 2976 states and 4588 transitions. Word has length 326 [2020-07-20 18:29:04,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:04,698 INFO L479 AbstractCegarLoop]: Abstraction has 2976 states and 4588 transitions. [2020-07-20 18:29:04,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:04,699 INFO L276 IsEmpty]: Start isEmpty. Operand 2976 states and 4588 transitions. [2020-07-20 18:29:04,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 18:29:04,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:04,709 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:04,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:04,924 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:04,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:04,925 INFO L82 PathProgramCache]: Analyzing trace with hash -668412942, now seen corresponding path program 1 times [2020-07-20 18:29:04,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:04,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709413343] [2020-07-20 18:29:04,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:05,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:05,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:05,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 1964 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:05,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:05,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:05,391 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:05,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709413343] [2020-07-20 18:29:05,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:05,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:05,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856905072] [2020-07-20 18:29:05,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:05,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:05,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:05,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:05,395 INFO L87 Difference]: Start difference. First operand 2976 states and 4588 transitions. Second operand 3 states. [2020-07-20 18:29:05,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:05,686 INFO L93 Difference]: Finished difference Result 8732 states and 13432 transitions. [2020-07-20 18:29:05,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:05,687 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 327 [2020-07-20 18:29:05,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:05,713 INFO L225 Difference]: With dead ends: 8732 [2020-07-20 18:29:05,714 INFO L226 Difference]: Without dead ends: 5821 [2020-07-20 18:29:05,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:05,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5821 states. [2020-07-20 18:29:05,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5821 to 2992. [2020-07-20 18:29:05,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2992 states. [2020-07-20 18:29:05,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2992 states to 2992 states and 4608 transitions. [2020-07-20 18:29:05,883 INFO L78 Accepts]: Start accepts. Automaton has 2992 states and 4608 transitions. Word has length 327 [2020-07-20 18:29:05,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:05,883 INFO L479 AbstractCegarLoop]: Abstraction has 2992 states and 4608 transitions. [2020-07-20 18:29:05,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:05,883 INFO L276 IsEmpty]: Start isEmpty. Operand 2992 states and 4608 transitions. [2020-07-20 18:29:05,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-20 18:29:05,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:05,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:06,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:06,110 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:06,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:06,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1292238374, now seen corresponding path program 1 times [2020-07-20 18:29:06,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:06,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045731348] [2020-07-20 18:29:06,113 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:06,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:06,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:06,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 1964 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:06,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:06,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:06,722 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:06,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045731348] [2020-07-20 18:29:06,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:06,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:06,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007967160] [2020-07-20 18:29:06,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:06,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:06,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:06,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:06,725 INFO L87 Difference]: Start difference. First operand 2992 states and 4608 transitions. Second operand 3 states. [2020-07-20 18:29:06,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:06,971 INFO L93 Difference]: Finished difference Result 8695 states and 13359 transitions. [2020-07-20 18:29:06,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:06,972 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 328 [2020-07-20 18:29:06,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:06,998 INFO L225 Difference]: With dead ends: 8695 [2020-07-20 18:29:06,999 INFO L226 Difference]: Without dead ends: 5860 [2020-07-20 18:29:07,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:07,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5860 states. [2020-07-20 18:29:07,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5860 to 5858. [2020-07-20 18:29:07,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5858 states. [2020-07-20 18:29:07,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5858 states to 5858 states and 8969 transitions. [2020-07-20 18:29:07,268 INFO L78 Accepts]: Start accepts. Automaton has 5858 states and 8969 transitions. Word has length 328 [2020-07-20 18:29:07,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:07,269 INFO L479 AbstractCegarLoop]: Abstraction has 5858 states and 8969 transitions. [2020-07-20 18:29:07,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:07,269 INFO L276 IsEmpty]: Start isEmpty. Operand 5858 states and 8969 transitions. [2020-07-20 18:29:07,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2020-07-20 18:29:07,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:07,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:07,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:07,498 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:07,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:07,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1969038845, now seen corresponding path program 1 times [2020-07-20 18:29:07,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:07,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241858901] [2020-07-20 18:29:07,499 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:07,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:07,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:07,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 1145 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:29:07,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:07,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:07,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:07,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241858901] [2020-07-20 18:29:07,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:07,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:07,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128586316] [2020-07-20 18:29:07,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:07,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:07,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:07,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:07,933 INFO L87 Difference]: Start difference. First operand 5858 states and 8969 transitions. Second operand 4 states. [2020-07-20 18:29:08,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:08,271 INFO L93 Difference]: Finished difference Result 15968 states and 24270 transitions. [2020-07-20 18:29:08,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:08,272 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 328 [2020-07-20 18:29:08,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:08,307 INFO L225 Difference]: With dead ends: 15968 [2020-07-20 18:29:08,307 INFO L226 Difference]: Without dead ends: 10726 [2020-07-20 18:29:08,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:08,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10726 states. [2020-07-20 18:29:08,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10726 to 6208. [2020-07-20 18:29:08,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6208 states. [2020-07-20 18:29:08,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6208 states to 6208 states and 9566 transitions. [2020-07-20 18:29:08,623 INFO L78 Accepts]: Start accepts. Automaton has 6208 states and 9566 transitions. Word has length 328 [2020-07-20 18:29:08,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:08,623 INFO L479 AbstractCegarLoop]: Abstraction has 6208 states and 9566 transitions. [2020-07-20 18:29:08,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:08,623 INFO L276 IsEmpty]: Start isEmpty. Operand 6208 states and 9566 transitions. [2020-07-20 18:29:08,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:08,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:08,637 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:08,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:08,850 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:08,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:08,850 INFO L82 PathProgramCache]: Analyzing trace with hash -244524821, now seen corresponding path program 1 times [2020-07-20 18:29:08,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:08,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164981566] [2020-07-20 18:29:08,851 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:09,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:09,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:09,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:09,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:09,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:09,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:09,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164981566] [2020-07-20 18:29:09,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:09,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:09,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153311162] [2020-07-20 18:29:09,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:09,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:09,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:09,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:09,284 INFO L87 Difference]: Start difference. First operand 6208 states and 9566 transitions. Second operand 4 states. [2020-07-20 18:29:09,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:09,666 INFO L93 Difference]: Finished difference Result 13957 states and 21436 transitions. [2020-07-20 18:29:09,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:09,666 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 330 [2020-07-20 18:29:09,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:09,686 INFO L225 Difference]: With dead ends: 13957 [2020-07-20 18:29:09,687 INFO L226 Difference]: Without dead ends: 7159 [2020-07-20 18:29:09,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:09,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7159 states. [2020-07-20 18:29:09,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7159 to 7157. [2020-07-20 18:29:09,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7157 states. [2020-07-20 18:29:09,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7157 states to 7157 states and 10955 transitions. [2020-07-20 18:29:09,987 INFO L78 Accepts]: Start accepts. Automaton has 7157 states and 10955 transitions. Word has length 330 [2020-07-20 18:29:09,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:09,988 INFO L479 AbstractCegarLoop]: Abstraction has 7157 states and 10955 transitions. [2020-07-20 18:29:09,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:09,988 INFO L276 IsEmpty]: Start isEmpty. Operand 7157 states and 10955 transitions. [2020-07-20 18:29:10,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2020-07-20 18:29:10,005 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:10,006 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:10,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:10,221 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:10,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:10,221 INFO L82 PathProgramCache]: Analyzing trace with hash -958899585, now seen corresponding path program 1 times [2020-07-20 18:29:10,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:10,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574906862] [2020-07-20 18:29:10,222 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:10,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:10,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:10,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 1976 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:10,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:10,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:10,844 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:10,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574906862] [2020-07-20 18:29:10,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:10,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:10,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695888095] [2020-07-20 18:29:10,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:10,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:10,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:10,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:10,847 INFO L87 Difference]: Start difference. First operand 7157 states and 10955 transitions. Second operand 3 states. [2020-07-20 18:29:11,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:11,253 INFO L93 Difference]: Finished difference Result 13759 states and 21127 transitions. [2020-07-20 18:29:11,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:11,256 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 330 [2020-07-20 18:29:11,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:11,278 INFO L225 Difference]: With dead ends: 13759 [2020-07-20 18:29:11,278 INFO L226 Difference]: Without dead ends: 9343 [2020-07-20 18:29:11,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:11,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9343 states. [2020-07-20 18:29:11,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9343 to 8141. [2020-07-20 18:29:11,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8141 states. [2020-07-20 18:29:11,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8141 states to 8141 states and 12545 transitions. [2020-07-20 18:29:11,641 INFO L78 Accepts]: Start accepts. Automaton has 8141 states and 12545 transitions. Word has length 330 [2020-07-20 18:29:11,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:11,641 INFO L479 AbstractCegarLoop]: Abstraction has 8141 states and 12545 transitions. [2020-07-20 18:29:11,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:11,642 INFO L276 IsEmpty]: Start isEmpty. Operand 8141 states and 12545 transitions. [2020-07-20 18:29:11,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2020-07-20 18:29:11,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:11,655 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] [2020-07-20 18:29:11,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:11,870 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:11,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:11,871 INFO L82 PathProgramCache]: Analyzing trace with hash -519073560, now seen corresponding path program 1 times [2020-07-20 18:29:11,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:11,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718021823] [2020-07-20 18:29:11,873 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:12,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:12,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:12,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 1152 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:12,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:12,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:12,302 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:12,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718021823] [2020-07-20 18:29:12,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:12,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:12,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476755468] [2020-07-20 18:29:12,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:12,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:12,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:12,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:12,305 INFO L87 Difference]: Start difference. First operand 8141 states and 12545 transitions. Second operand 3 states. [2020-07-20 18:29:13,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:13,004 INFO L93 Difference]: Finished difference Result 21684 states and 32997 transitions. [2020-07-20 18:29:13,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:13,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 331 [2020-07-20 18:29:13,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:13,050 INFO L225 Difference]: With dead ends: 21684 [2020-07-20 18:29:13,051 INFO L226 Difference]: Without dead ends: 14856 [2020-07-20 18:29:13,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:13,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14856 states. [2020-07-20 18:29:13,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14856 to 8271. [2020-07-20 18:29:13,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8271 states. [2020-07-20 18:29:13,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8271 states to 8271 states and 12711 transitions. [2020-07-20 18:29:13,545 INFO L78 Accepts]: Start accepts. Automaton has 8271 states and 12711 transitions. Word has length 331 [2020-07-20 18:29:13,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:13,546 INFO L479 AbstractCegarLoop]: Abstraction has 8271 states and 12711 transitions. [2020-07-20 18:29:13,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:13,546 INFO L276 IsEmpty]: Start isEmpty. Operand 8271 states and 12711 transitions. [2020-07-20 18:29:13,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:13,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:13,562 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:13,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:13,776 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:13,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:13,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1050521134, now seen corresponding path program 1 times [2020-07-20 18:29:13,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:13,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804296126] [2020-07-20 18:29:13,777 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:14,086 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:14,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:14,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 982 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:29:14,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:14,220 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:14,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:14,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804296126] [2020-07-20 18:29:14,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:14,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:29:14,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209855622] [2020-07-20 18:29:14,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:29:14,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:14,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:29:14,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:29:14,222 INFO L87 Difference]: Start difference. First operand 8271 states and 12711 transitions. Second operand 9 states. [2020-07-20 18:29:20,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:20,944 INFO L93 Difference]: Finished difference Result 46938 states and 73609 transitions. [2020-07-20 18:29:20,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 18:29:20,945 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 332 [2020-07-20 18:29:20,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:21,043 INFO L225 Difference]: With dead ends: 46938 [2020-07-20 18:29:21,043 INFO L226 Difference]: Without dead ends: 45190 [2020-07-20 18:29:21,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 424 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=1112, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 18:29:21,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45190 states. [2020-07-20 18:29:22,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45190 to 19490. [2020-07-20 18:29:22,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19490 states. [2020-07-20 18:29:22,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19490 states to 19490 states and 30275 transitions. [2020-07-20 18:29:22,165 INFO L78 Accepts]: Start accepts. Automaton has 19490 states and 30275 transitions. Word has length 332 [2020-07-20 18:29:22,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:22,165 INFO L479 AbstractCegarLoop]: Abstraction has 19490 states and 30275 transitions. [2020-07-20 18:29:22,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:29:22,166 INFO L276 IsEmpty]: Start isEmpty. Operand 19490 states and 30275 transitions. [2020-07-20 18:29:22,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:22,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:22,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:22,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:22,387 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:22,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:22,388 INFO L82 PathProgramCache]: Analyzing trace with hash 1366856249, now seen corresponding path program 1 times [2020-07-20 18:29:22,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:22,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1171734583] [2020-07-20 18:29:22,389 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:22,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:22,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:22,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:22,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:22,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:22,827 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:22,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1171734583] [2020-07-20 18:29:22,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:22,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:22,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843871532] [2020-07-20 18:29:22,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:22,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:22,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:22,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:22,830 INFO L87 Difference]: Start difference. First operand 19490 states and 30275 transitions. Second operand 4 states. [2020-07-20 18:29:24,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:24,809 INFO L93 Difference]: Finished difference Result 42102 states and 66457 transitions. [2020-07-20 18:29:24,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:24,810 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-07-20 18:29:24,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:24,874 INFO L225 Difference]: With dead ends: 42102 [2020-07-20 18:29:24,875 INFO L226 Difference]: Without dead ends: 33722 [2020-07-20 18:29:24,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:24,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33722 states. [2020-07-20 18:29:27,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33722 to 33720. [2020-07-20 18:29:27,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33720 states. [2020-07-20 18:29:27,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33720 states to 33720 states and 52567 transitions. [2020-07-20 18:29:27,156 INFO L78 Accepts]: Start accepts. Automaton has 33720 states and 52567 transitions. Word has length 332 [2020-07-20 18:29:27,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:27,157 INFO L479 AbstractCegarLoop]: Abstraction has 33720 states and 52567 transitions. [2020-07-20 18:29:27,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:27,157 INFO L276 IsEmpty]: Start isEmpty. Operand 33720 states and 52567 transitions. [2020-07-20 18:29:27,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:27,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:27,182 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:27,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:27,383 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:27,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:27,384 INFO L82 PathProgramCache]: Analyzing trace with hash -647054575, now seen corresponding path program 1 times [2020-07-20 18:29:27,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:27,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780663092] [2020-07-20 18:29:27,385 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:27,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:27,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:27,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 1979 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 18:29:27,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:27,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:27,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:27,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780663092] [2020-07-20 18:29:27,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:27,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 18:29:27,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946707506] [2020-07-20 18:29:27,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:29:27,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:27,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:29:27,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:29:27,986 INFO L87 Difference]: Start difference. First operand 33720 states and 52567 transitions. Second operand 8 states. [2020-07-20 18:29:31,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:31,319 INFO L93 Difference]: Finished difference Result 53999 states and 84724 transitions. [2020-07-20 18:29:31,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 18:29:31,319 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 332 [2020-07-20 18:29:31,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:31,376 INFO L225 Difference]: With dead ends: 53999 [2020-07-20 18:29:31,376 INFO L226 Difference]: Without dead ends: 36955 [2020-07-20 18:29:31,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:29:31,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36955 states. [2020-07-20 18:29:33,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36955 to 17768. [2020-07-20 18:29:33,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17768 states. [2020-07-20 18:29:33,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17768 states to 17768 states and 27178 transitions. [2020-07-20 18:29:33,621 INFO L78 Accepts]: Start accepts. Automaton has 17768 states and 27178 transitions. Word has length 332 [2020-07-20 18:29:33,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:33,621 INFO L479 AbstractCegarLoop]: Abstraction has 17768 states and 27178 transitions. [2020-07-20 18:29:33,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:29:33,622 INFO L276 IsEmpty]: Start isEmpty. Operand 17768 states and 27178 transitions. [2020-07-20 18:29:33,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:33,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:33,632 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:33,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:33,833 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:33,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:33,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1174737006, now seen corresponding path program 1 times [2020-07-20 18:29:33,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:33,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344071508] [2020-07-20 18:29:33,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:34,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:34,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:34,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 1976 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:34,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:34,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:34,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:34,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344071508] [2020-07-20 18:29:34,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:34,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:34,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542374774] [2020-07-20 18:29:34,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:34,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:34,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:34,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:34,281 INFO L87 Difference]: Start difference. First operand 17768 states and 27178 transitions. Second operand 3 states. [2020-07-20 18:29:35,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:35,578 INFO L93 Difference]: Finished difference Result 38828 states and 59623 transitions. [2020-07-20 18:29:35,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:35,578 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 332 [2020-07-20 18:29:35,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:35,611 INFO L225 Difference]: With dead ends: 38828 [2020-07-20 18:29:35,612 INFO L226 Difference]: Without dead ends: 23709 [2020-07-20 18:29:35,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:35,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23709 states. [2020-07-20 18:29:36,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23709 to 20967. [2020-07-20 18:29:36,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20967 states. [2020-07-20 18:29:36,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20967 states to 20967 states and 32288 transitions. [2020-07-20 18:29:36,848 INFO L78 Accepts]: Start accepts. Automaton has 20967 states and 32288 transitions. Word has length 332 [2020-07-20 18:29:36,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:36,849 INFO L479 AbstractCegarLoop]: Abstraction has 20967 states and 32288 transitions. [2020-07-20 18:29:36,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:36,849 INFO L276 IsEmpty]: Start isEmpty. Operand 20967 states and 32288 transitions. [2020-07-20 18:29:36,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2020-07-20 18:29:36,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:36,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:37,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:37,060 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:37,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:37,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1665463937, now seen corresponding path program 1 times [2020-07-20 18:29:37,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:37,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393453874] [2020-07-20 18:29:37,063 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:37,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:37,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:37,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 1152 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:29:37,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:37,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:37,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:37,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393453874] [2020-07-20 18:29:37,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:37,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:29:37,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656453351] [2020-07-20 18:29:37,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:29:37,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:37,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:29:37,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:29:37,411 INFO L87 Difference]: Start difference. First operand 20967 states and 32288 transitions. Second operand 4 states. [2020-07-20 18:29:38,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:38,691 INFO L93 Difference]: Finished difference Result 30390 states and 46764 transitions. [2020-07-20 18:29:38,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:29:38,691 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 332 [2020-07-20 18:29:38,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:38,716 INFO L225 Difference]: With dead ends: 30390 [2020-07-20 18:29:38,716 INFO L226 Difference]: Without dead ends: 21004 [2020-07-20 18:29:38,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:29:38,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21004 states. [2020-07-20 18:29:39,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21004 to 20104. [2020-07-20 18:29:39,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20104 states. [2020-07-20 18:29:39,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20104 states to 20104 states and 31017 transitions. [2020-07-20 18:29:39,982 INFO L78 Accepts]: Start accepts. Automaton has 20104 states and 31017 transitions. Word has length 332 [2020-07-20 18:29:39,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:39,982 INFO L479 AbstractCegarLoop]: Abstraction has 20104 states and 31017 transitions. [2020-07-20 18:29:39,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:29:39,982 INFO L276 IsEmpty]: Start isEmpty. Operand 20104 states and 31017 transitions. [2020-07-20 18:29:39,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-20 18:29:39,991 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:39,991 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:40,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:40,197 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:40,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:40,198 INFO L82 PathProgramCache]: Analyzing trace with hash 2025139653, now seen corresponding path program 1 times [2020-07-20 18:29:40,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:40,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368913796] [2020-07-20 18:29:40,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:40,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:29:40,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:40,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 974 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:40,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:40,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:40,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:40,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368913796] [2020-07-20 18:29:40,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:40,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:40,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387136848] [2020-07-20 18:29:40,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:40,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:40,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:40,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:40,498 INFO L87 Difference]: Start difference. First operand 20104 states and 31017 transitions. Second operand 3 states. [2020-07-20 18:29:43,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:43,280 INFO L93 Difference]: Finished difference Result 59037 states and 90874 transitions. [2020-07-20 18:29:43,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:29:43,281 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 333 [2020-07-20 18:29:43,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:43,322 INFO L225 Difference]: With dead ends: 59037 [2020-07-20 18:29:43,323 INFO L226 Difference]: Without dead ends: 39568 [2020-07-20 18:29:43,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:43,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39568 states. [2020-07-20 18:29:44,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39568 to 20191. [2020-07-20 18:29:44,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20191 states. [2020-07-20 18:29:44,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20191 states to 20191 states and 31128 transitions. [2020-07-20 18:29:44,557 INFO L78 Accepts]: Start accepts. Automaton has 20191 states and 31128 transitions. Word has length 333 [2020-07-20 18:29:44,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:44,557 INFO L479 AbstractCegarLoop]: Abstraction has 20191 states and 31128 transitions. [2020-07-20 18:29:44,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:29:44,557 INFO L276 IsEmpty]: Start isEmpty. Operand 20191 states and 31128 transitions. [2020-07-20 18:29:44,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 18:29:44,568 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:44,569 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:44,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:44,783 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:44,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:44,784 INFO L82 PathProgramCache]: Analyzing trace with hash -795670300, now seen corresponding path program 1 times [2020-07-20 18:29:44,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:44,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067504877] [2020-07-20 18:29:44,785 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:45,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:29:45,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:45,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 18:29:45,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:45,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:45,195 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:45,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067504877] [2020-07-20 18:29:45,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:45,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 18:29:45,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730646015] [2020-07-20 18:29:45,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:29:45,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:45,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:29:45,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:29:45,197 INFO L87 Difference]: Start difference. First operand 20191 states and 31128 transitions. Second operand 9 states. [2020-07-20 18:29:52,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:29:52,881 INFO L93 Difference]: Finished difference Result 72114 states and 112791 transitions. [2020-07-20 18:29:52,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 18:29:52,882 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 334 [2020-07-20 18:29:52,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:29:52,970 INFO L225 Difference]: With dead ends: 72114 [2020-07-20 18:29:52,970 INFO L226 Difference]: Without dead ends: 68444 [2020-07-20 18:29:52,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=633, Unknown=0, NotChecked=0, Total=870 [2020-07-20 18:29:53,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68444 states. [2020-07-20 18:29:55,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68444 to 38722. [2020-07-20 18:29:55,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38722 states. [2020-07-20 18:29:55,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38722 states to 38722 states and 60208 transitions. [2020-07-20 18:29:55,771 INFO L78 Accepts]: Start accepts. Automaton has 38722 states and 60208 transitions. Word has length 334 [2020-07-20 18:29:55,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:29:55,771 INFO L479 AbstractCegarLoop]: Abstraction has 38722 states and 60208 transitions. [2020-07-20 18:29:55,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:29:55,771 INFO L276 IsEmpty]: Start isEmpty. Operand 38722 states and 60208 transitions. [2020-07-20 18:29:55,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 18:29:55,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:29:55,791 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:29:56,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:56,007 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:29:56,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:29:56,008 INFO L82 PathProgramCache]: Analyzing trace with hash 990941403, now seen corresponding path program 1 times [2020-07-20 18:29:56,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:29:56,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520964780] [2020-07-20 18:29:56,009 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:29:56,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:29:56,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:29:56,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 1981 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:29:56,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:29:56,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:29:56,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:29:56,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520964780] [2020-07-20 18:29:56,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:29:56,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:29:56,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249768127] [2020-07-20 18:29:56,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:29:56,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:29:56,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:29:56,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:29:56,460 INFO L87 Difference]: Start difference. First operand 38722 states and 60208 transitions. Second operand 3 states. [2020-07-20 18:30:01,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:01,635 INFO L93 Difference]: Finished difference Result 92875 states and 146028 transitions. [2020-07-20 18:30:01,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:01,636 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 334 [2020-07-20 18:30:01,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:01,710 INFO L225 Difference]: With dead ends: 92875 [2020-07-20 18:30:01,710 INFO L226 Difference]: Without dead ends: 56750 [2020-07-20 18:30:01,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:01,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56750 states. [2020-07-20 18:30:05,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56750 to 53943. [2020-07-20 18:30:05,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53943 states. [2020-07-20 18:30:05,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53943 states to 53943 states and 84736 transitions. [2020-07-20 18:30:05,474 INFO L78 Accepts]: Start accepts. Automaton has 53943 states and 84736 transitions. Word has length 334 [2020-07-20 18:30:05,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:05,474 INFO L479 AbstractCegarLoop]: Abstraction has 53943 states and 84736 transitions. [2020-07-20 18:30:05,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:05,475 INFO L276 IsEmpty]: Start isEmpty. Operand 53943 states and 84736 transitions. [2020-07-20 18:30:05,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2020-07-20 18:30:05,488 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:05,488 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:30:05,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:05,694 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:05,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:05,695 INFO L82 PathProgramCache]: Analyzing trace with hash 432112168, now seen corresponding path program 1 times [2020-07-20 18:30:05,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:05,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913384243] [2020-07-20 18:30:05,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:05,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:30:05,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:05,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:30:05,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:06,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:06,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:06,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913384243] [2020-07-20 18:30:06,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:06,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:30:06,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290431826] [2020-07-20 18:30:06,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:30:06,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:06,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:30:06,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:30:06,048 INFO L87 Difference]: Start difference. First operand 53943 states and 84736 transitions. Second operand 4 states. [2020-07-20 18:30:10,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:10,668 INFO L93 Difference]: Finished difference Result 79154 states and 123756 transitions. [2020-07-20 18:30:10,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:30:10,669 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 334 [2020-07-20 18:30:10,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:10,763 INFO L225 Difference]: With dead ends: 79154 [2020-07-20 18:30:10,764 INFO L226 Difference]: Without dead ends: 65623 [2020-07-20 18:30:10,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:30:10,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65623 states. [2020-07-20 18:30:15,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65623 to 54215. [2020-07-20 18:30:15,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54215 states. [2020-07-20 18:30:16,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54215 states to 54215 states and 85183 transitions. [2020-07-20 18:30:16,068 INFO L78 Accepts]: Start accepts. Automaton has 54215 states and 85183 transitions. Word has length 334 [2020-07-20 18:30:16,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:16,068 INFO L479 AbstractCegarLoop]: Abstraction has 54215 states and 85183 transitions. [2020-07-20 18:30:16,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:30:16,068 INFO L276 IsEmpty]: Start isEmpty. Operand 54215 states and 85183 transitions. [2020-07-20 18:30:16,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 18:30:16,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:16,082 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] [2020-07-20 18:30:16,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:16,288 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:16,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:16,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1104040315, now seen corresponding path program 1 times [2020-07-20 18:30:16,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:16,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965018005] [2020-07-20 18:30:16,290 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:16,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:30:16,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:16,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:16,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:16,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:16,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:16,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965018005] [2020-07-20 18:30:16,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:16,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:16,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674343870] [2020-07-20 18:30:16,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:16,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:16,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:16,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:16,614 INFO L87 Difference]: Start difference. First operand 54215 states and 85183 transitions. Second operand 3 states. [2020-07-20 18:30:24,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:24,077 INFO L93 Difference]: Finished difference Result 158927 states and 249370 transitions. [2020-07-20 18:30:24,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:24,077 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 18:30:24,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:24,218 INFO L225 Difference]: With dead ends: 158927 [2020-07-20 18:30:24,218 INFO L226 Difference]: Without dead ends: 106567 [2020-07-20 18:30:24,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:24,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106567 states. [2020-07-20 18:30:30,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106567 to 54297. [2020-07-20 18:30:30,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54297 states. [2020-07-20 18:30:30,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54297 states to 54297 states and 85298 transitions. [2020-07-20 18:30:30,724 INFO L78 Accepts]: Start accepts. Automaton has 54297 states and 85298 transitions. Word has length 336 [2020-07-20 18:30:30,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:30,725 INFO L479 AbstractCegarLoop]: Abstraction has 54297 states and 85298 transitions. [2020-07-20 18:30:30,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:30,725 INFO L276 IsEmpty]: Start isEmpty. Operand 54297 states and 85298 transitions. [2020-07-20 18:30:30,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2020-07-20 18:30:30,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:30,737 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] [2020-07-20 18:30:30,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:30,945 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:30,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:30,946 INFO L82 PathProgramCache]: Analyzing trace with hash -75880928, now seen corresponding path program 1 times [2020-07-20 18:30:30,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:30,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1897267849] [2020-07-20 18:30:30,947 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:31,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:31,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:31,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 1982 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:30:31,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:31,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:31,385 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:31,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1897267849] [2020-07-20 18:30:31,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:31,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:30:31,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602062348] [2020-07-20 18:30:31,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:30:31,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:31,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:30:31,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:31,387 INFO L87 Difference]: Start difference. First operand 54297 states and 85298 transitions. Second operand 3 states. [2020-07-20 18:30:39,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:39,615 INFO L93 Difference]: Finished difference Result 161181 states and 253047 transitions. [2020-07-20 18:30:39,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:30:39,616 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 336 [2020-07-20 18:30:39,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:39,748 INFO L225 Difference]: With dead ends: 161181 [2020-07-20 18:30:39,748 INFO L226 Difference]: Without dead ends: 107643 [2020-07-20 18:30:39,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:30:39,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107643 states. [2020-07-20 18:30:44,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107643 to 54365. [2020-07-20 18:30:44,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54365 states. [2020-07-20 18:30:44,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54365 states to 54365 states and 85375 transitions. [2020-07-20 18:30:44,548 INFO L78 Accepts]: Start accepts. Automaton has 54365 states and 85375 transitions. Word has length 336 [2020-07-20 18:30:44,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:30:44,549 INFO L479 AbstractCegarLoop]: Abstraction has 54365 states and 85375 transitions. [2020-07-20 18:30:44,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:30:44,549 INFO L276 IsEmpty]: Start isEmpty. Operand 54365 states and 85375 transitions. [2020-07-20 18:30:44,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 18:30:44,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:30:44,562 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] [2020-07-20 18:30:44,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:44,763 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:30:44,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:30:44,764 INFO L82 PathProgramCache]: Analyzing trace with hash -236301095, now seen corresponding path program 1 times [2020-07-20 18:30:44,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:30:44,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976975297] [2020-07-20 18:30:44,765 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:30:45,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:30:45,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:30:45,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 1989 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:30:45,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:30:45,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:30:45,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:30:45,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976975297] [2020-07-20 18:30:45,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:30:45,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 18:30:45,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520112176] [2020-07-20 18:30:45,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 18:30:45,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:30:45,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 18:30:45,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:30:45,355 INFO L87 Difference]: Start difference. First operand 54365 states and 85375 transitions. Second operand 5 states. [2020-07-20 18:30:56,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:30:56,448 INFO L93 Difference]: Finished difference Result 148846 states and 235396 transitions. [2020-07-20 18:30:56,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 18:30:56,449 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 337 [2020-07-20 18:30:56,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:30:56,584 INFO L225 Difference]: With dead ends: 148846 [2020-07-20 18:30:56,585 INFO L226 Difference]: Without dead ends: 106191 [2020-07-20 18:30:56,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-20 18:30:56,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106191 states. [2020-07-20 18:31:05,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106191 to 106189. [2020-07-20 18:31:05,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106189 states. [2020-07-20 18:31:05,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106189 states to 106189 states and 166579 transitions. [2020-07-20 18:31:05,867 INFO L78 Accepts]: Start accepts. Automaton has 106189 states and 166579 transitions. Word has length 337 [2020-07-20 18:31:05,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:31:05,868 INFO L479 AbstractCegarLoop]: Abstraction has 106189 states and 166579 transitions. [2020-07-20 18:31:05,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 18:31:05,868 INFO L276 IsEmpty]: Start isEmpty. Operand 106189 states and 166579 transitions. [2020-07-20 18:31:05,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 18:31:05,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:31:05,890 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] [2020-07-20 18:31:06,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:06,091 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:31:06,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:31:06,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1570269791, now seen corresponding path program 1 times [2020-07-20 18:31:06,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:31:06,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432787324] [2020-07-20 18:31:06,092 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:06,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:31:06,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:31:06,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 1163 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 18:31:06,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:31:06,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:31:06,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:31:06,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432787324] [2020-07-20 18:31:06,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:31:06,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:31:06,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686832765] [2020-07-20 18:31:06,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:31:06,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:31:06,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:31:06,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:31:06,434 INFO L87 Difference]: Start difference. First operand 106189 states and 166579 transitions. Second operand 3 states. [2020-07-20 18:31:25,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:31:25,169 INFO L93 Difference]: Finished difference Result 291172 states and 460408 transitions. [2020-07-20 18:31:25,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:31:25,170 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 337 [2020-07-20 18:31:25,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:31:25,459 INFO L225 Difference]: With dead ends: 291172 [2020-07-20 18:31:25,459 INFO L226 Difference]: Without dead ends: 205471 [2020-07-20 18:31:25,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:31:25,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205471 states. [2020-07-20 18:31:45,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205471 to 205469. [2020-07-20 18:31:45,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205469 states. [2020-07-20 18:31:46,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205469 states to 205469 states and 322540 transitions. [2020-07-20 18:31:46,216 INFO L78 Accepts]: Start accepts. Automaton has 205469 states and 322540 transitions. Word has length 337 [2020-07-20 18:31:46,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:31:46,216 INFO L479 AbstractCegarLoop]: Abstraction has 205469 states and 322540 transitions. [2020-07-20 18:31:46,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:31:46,217 INFO L276 IsEmpty]: Start isEmpty. Operand 205469 states and 322540 transitions. [2020-07-20 18:31:46,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 18:31:46,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:31:46,256 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] [2020-07-20 18:31:46,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:46,462 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:31:46,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:31:46,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1485134142, now seen corresponding path program 1 times [2020-07-20 18:31:46,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:31:46,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133666638] [2020-07-20 18:31:46,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:31:46,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:31:46,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:31:46,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1990 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 18:31:46,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:31:47,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:31:47,450 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:31:47,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133666638] [2020-07-20 18:31:47,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:31:47,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 18:31:47,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932168173] [2020-07-20 18:31:47,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 18:31:47,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:31:47,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 18:31:47,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 18:31:47,451 INFO L87 Difference]: Start difference. First operand 205469 states and 322540 transitions. Second operand 4 states. [2020-07-20 18:32:29,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:32:29,457 INFO L93 Difference]: Finished difference Result 605411 states and 950345 transitions. [2020-07-20 18:32:29,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 18:32:29,458 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 337 [2020-07-20 18:32:29,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:32:30,177 INFO L225 Difference]: With dead ends: 605411 [2020-07-20 18:32:30,178 INFO L226 Difference]: Without dead ends: 400235 [2020-07-20 18:32:30,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 18:32:30,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400235 states. [2020-07-20 18:33:12,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400235 to 400233. [2020-07-20 18:33:12,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400233 states. [2020-07-20 18:33:13,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400233 states to 400233 states and 624410 transitions. [2020-07-20 18:33:13,517 INFO L78 Accepts]: Start accepts. Automaton has 400233 states and 624410 transitions. Word has length 337 [2020-07-20 18:33:13,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:33:13,518 INFO L479 AbstractCegarLoop]: Abstraction has 400233 states and 624410 transitions. [2020-07-20 18:33:13,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 18:33:13,518 INFO L276 IsEmpty]: Start isEmpty. Operand 400233 states and 624410 transitions. [2020-07-20 18:33:13,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 18:33:13,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:33:13,593 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] [2020-07-20 18:33:13,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:33:13,794 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:33:13,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:33:13,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1271326686, now seen corresponding path program 1 times [2020-07-20 18:33:13,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:33:13,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115356448] [2020-07-20 18:33:13,796 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:33:14,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:33:14,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:33:14,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 1986 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 18:33:14,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:33:14,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:33:14,259 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:33:14,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115356448] [2020-07-20 18:33:14,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:33:14,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 18:33:14,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967403856] [2020-07-20 18:33:14,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 18:33:14,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:33:14,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 18:33:14,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:33:14,261 INFO L87 Difference]: Start difference. First operand 400233 states and 624410 transitions. Second operand 3 states. [2020-07-20 18:34:37,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:34:37,463 INFO L93 Difference]: Finished difference Result 1181226 states and 1843720 transitions. [2020-07-20 18:34:37,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 18:34:37,464 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 339 [2020-07-20 18:34:37,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:34:38,871 INFO L225 Difference]: With dead ends: 1181226 [2020-07-20 18:34:38,871 INFO L226 Difference]: Without dead ends: 784015 [2020-07-20 18:34:39,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 18:34:39,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 784015 states. [2020-07-20 18:36:23,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 784015 to 784013. [2020-07-20 18:36:23,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 784013 states. [2020-07-20 18:36:24,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 784013 states to 784013 states and 1219013 transitions. [2020-07-20 18:36:24,661 INFO L78 Accepts]: Start accepts. Automaton has 784013 states and 1219013 transitions. Word has length 339 [2020-07-20 18:36:24,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:36:24,662 INFO L479 AbstractCegarLoop]: Abstraction has 784013 states and 1219013 transitions. [2020-07-20 18:36:24,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 18:36:24,662 INFO L276 IsEmpty]: Start isEmpty. Operand 784013 states and 1219013 transitions. [2020-07-20 18:36:24,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-20 18:36:24,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:36:24,831 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] [2020-07-20 18:36:25,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:25,032 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:36:25,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:36:25,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1976720448, now seen corresponding path program 1 times [2020-07-20 18:36:25,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:36:25,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439669969] [2020-07-20 18:36:25,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:36:25,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 18:36:25,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:36:25,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 1164 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 18:36:25,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:36:26,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:36:26,479 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:36:26,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439669969] [2020-07-20 18:36:26,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:36:26,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-20 18:36:26,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043758252] [2020-07-20 18:36:26,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 18:36:26,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:36:26,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 18:36:26,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:36:26,481 INFO L87 Difference]: Start difference. First operand 784013 states and 1219013 transitions. Second operand 12 states.