/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:21:57,391 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:21:57,394 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:21:57,412 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:21:57,412 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:21:57,417 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:21:57,418 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:21:57,421 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:21:57,423 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:21:57,424 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:21:57,426 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:21:57,427 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:21:57,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:21:57,429 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:21:57,431 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:21:57,432 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:21:57,434 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:21:57,435 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:21:57,437 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:21:57,440 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:21:57,442 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:21:57,443 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:21:57,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:21:57,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:21:57,449 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:21:57,463 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:21:57,480 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:21:57,480 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:21:57,482 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:21:57,482 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:21:57,482 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:21:57,483 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:21:57,483 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:21:57,483 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:21:57,483 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:21:57,483 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:21:57,484 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:21:57,484 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:21:57,484 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:21:57,484 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:21:57,485 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:21:57,485 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:21:57,485 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:21:57,485 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:21:57,486 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:21:57,486 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:21:57,486 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:21:57,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:21:57,486 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:21:57,487 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:21:57,487 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:21:57,487 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:21:57,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:57,488 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:21:57,488 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:21:57,488 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:21:57,828 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:21:57,846 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:21:57,851 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:21:57,853 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:21:57,854 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:21:57,855 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-1.c [2020-07-21 22:21:57,952 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba009bf29/ad2ee37b2b6845049e97b4cc83dfd65e/FLAG404b60d2b [2020-07-21 22:21:58,545 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:21:58,546 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i15_o15-1.c [2020-07-21 22:21:58,553 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba009bf29/ad2ee37b2b6845049e97b4cc83dfd65e/FLAG404b60d2b [2020-07-21 22:21:58,906 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ba009bf29/ad2ee37b2b6845049e97b4cc83dfd65e [2020-07-21 22:21:58,917 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:21:58,921 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:21:58,922 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:21:58,923 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:21:58,928 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:21:58,929 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:21:58" (1/1) ... [2020-07-21 22:21:58,933 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21521c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:58, skipping insertion in model container [2020-07-21 22:21:58,934 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:21:58" (1/1) ... [2020-07-21 22:21:58,944 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:21:58,964 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:21:59,138 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:21:59,144 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:21:59,163 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:21:59,181 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:21:59,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59 WrapperNode [2020-07-21 22:21:59,182 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:21:59,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:21:59,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:21:59,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:21:59,202 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,209 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,210 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,217 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,218 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... [2020-07-21 22:21:59,220 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:21:59,221 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:21:59,221 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:21:59,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:21:59,223 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:21:59,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:21:59,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:21:59,407 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 22:21:59,408 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:21:59,408 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:21:59,408 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:21:59,408 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 22:21:59,408 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:21:59,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:21:59,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:21:59,658 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:21:59,659 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:21:59,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:21:59 BoogieIcfgContainer [2020-07-21 22:21:59,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:21:59,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:21:59,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:21:59,672 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:21:59,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:21:58" (1/3) ... [2020-07-21 22:21:59,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7924772e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:21:59, skipping insertion in model container [2020-07-21 22:21:59,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:21:59" (2/3) ... [2020-07-21 22:21:59,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7924772e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:21:59, skipping insertion in model container [2020-07-21 22:21:59,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:21:59" (3/3) ... [2020-07-21 22:21:59,678 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-1.c [2020-07-21 22:21:59,693 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:21:59,702 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:21:59,721 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:21:59,756 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:21:59,756 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:21:59,756 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:21:59,757 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:21:59,757 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:21:59,758 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:21:59,758 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:21:59,758 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:21:59,784 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 22:21:59,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:21:59,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:21:59,795 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:21:59,796 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:21:59,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:21:59,805 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 22:21:59,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:21:59,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368869882] [2020-07-21 22:21:59,817 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:21:59,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:21:59,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:21:59,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:21:59,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:00,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:22:00,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:22:00,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368869882] [2020-07-21 22:22:00,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:22:00,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:22:00,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645094595] [2020-07-21 22:22:00,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:22:00,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:00,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:22:00,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:22:00,100 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 22:22:00,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:00,292 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 22:22:00,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:22:00,295 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:22:00,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:00,308 INFO L225 Difference]: With dead ends: 30 [2020-07-21 22:22:00,308 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 22:22:00,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 22:22:00,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 22:22:00,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 22:22:00,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 22:22:00,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 22:22:00,371 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 22:22:00,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:00,372 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 22:22:00,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:22:00,372 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 22:22:00,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 22:22:00,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:00,375 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:00,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:00,589 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:00,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:00,591 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 22:22:00,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:00,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379613200] [2020-07-21 22:22:00,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:00,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:00,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:00,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:22:00,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:00,716 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 22:22:00,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:00,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:00,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:01,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:22:01,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379613200] [2020-07-21 22:22:01,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:01,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:22:01,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421001400] [2020-07-21 22:22:01,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:22:01,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:01,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:22:01,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:22:01,136 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 22:22:01,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:01,240 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 22:22:01,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:22:01,241 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 22:22:01,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:01,243 INFO L225 Difference]: With dead ends: 25 [2020-07-21 22:22:01,243 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:22:01,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:22:01,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:22:01,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:22:01,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:22:01,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 22:22:01,253 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 22:22:01,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:01,254 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 22:22:01,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:22:01,254 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 22:22:01,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 22:22:01,256 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:01,256 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:01,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:01,471 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:01,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:01,472 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-21 22:22:01,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:01,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874237895] [2020-07-21 22:22:01,474 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:01,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:01,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:01,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:22:01,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:01,593 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 22:22:01,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:01,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:01,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:02,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:02,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:02,048 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:22:02,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874237895] [2020-07-21 22:22:02,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:02,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:22:02,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025892528] [2020-07-21 22:22:02,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:22:02,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:02,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:22:02,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:22:02,054 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 22:22:02,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:02,134 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 22:22:02,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:22:02,135 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 22:22:02,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:02,137 INFO L225 Difference]: With dead ends: 28 [2020-07-21 22:22:02,137 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 22:22:02,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:22:02,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 22:22:02,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 22:22:02,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 22:22:02,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 22:22:02,147 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 22:22:02,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:02,147 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 22:22:02,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:22:02,148 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 22:22:02,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 22:22:02,149 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:02,150 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:02,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:02,364 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:02,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:02,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-21 22:22:02,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:02,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650321131] [2020-07-21 22:22:02,366 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:02,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:02,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:02,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:22:02,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:02,479 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:22:02,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:02,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:03,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:03,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:03,136 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 22:22:03,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650321131] [2020-07-21 22:22:03,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:03,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:22:03,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782231615] [2020-07-21 22:22:03,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:22:03,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:03,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:22:03,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:22:03,140 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 22:22:03,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:03,253 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 22:22:03,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:22:03,255 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 22:22:03,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:03,256 INFO L225 Difference]: With dead ends: 31 [2020-07-21 22:22:03,257 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 22:22:03,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:22:03,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 22:22:03,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 22:22:03,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 22:22:03,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 22:22:03,266 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 22:22:03,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:03,266 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 22:22:03,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:22:03,267 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 22:22:03,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 22:22:03,268 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:03,269 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:03,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:03,478 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:03,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:03,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-21 22:22:03,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:03,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782158485] [2020-07-21 22:22:03,480 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:03,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:03,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:03,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:22:03,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:03,589 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 22:22:03,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:04,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:04,627 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 22:22:04,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782158485] [2020-07-21 22:22:04,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:04,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:22:04,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047518564] [2020-07-21 22:22:04,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:22:04,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:04,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:22:04,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:22:04,635 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 22:22:04,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:04,781 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 22:22:04,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:22:04,781 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 22:22:04,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:04,783 INFO L225 Difference]: With dead ends: 34 [2020-07-21 22:22:04,783 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:22:04,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:22:04,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:22:04,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:22:04,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:22:04,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 22:22:04,792 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 22:22:04,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:04,793 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 22:22:04,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:22:04,793 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 22:22:04,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 22:22:04,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:04,795 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:05,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:05,004 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:05,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:05,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-21 22:22:05,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:05,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461319426] [2020-07-21 22:22:05,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:05,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:05,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:05,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:22:05,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:05,132 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 22:22:05,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:05,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:06,565 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 22:22:06,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461319426] [2020-07-21 22:22:06,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:06,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:22:06,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531977570] [2020-07-21 22:22:06,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:22:06,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:06,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:22:06,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:22:06,572 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 22:22:06,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:06,726 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 22:22:06,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:22:06,727 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 22:22:06,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:06,729 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:22:06,729 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:22:06,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:22:06,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:22:06,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 22:22:06,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 22:22:06,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 22:22:06,746 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 22:22:06,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:06,747 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 22:22:06,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:22:06,750 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 22:22:06,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 22:22:06,755 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:06,755 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:06,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:06,974 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:06,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:06,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-21 22:22:06,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:06,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110176782] [2020-07-21 22:22:06,975 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:07,033 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:07,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:07,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:22:07,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:07,131 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 22:22:07,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:08,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:08,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:08,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:08,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:08,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:09,244 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 22:22:09,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110176782] [2020-07-21 22:22:09,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:09,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:22:09,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364731731] [2020-07-21 22:22:09,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:22:09,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:09,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:22:09,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:22:09,247 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 22:22:09,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:09,417 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 22:22:09,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:22:09,419 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 22:22:09,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:09,421 INFO L225 Difference]: With dead ends: 40 [2020-07-21 22:22:09,421 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:22:09,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:22:09,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:22:09,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 22:22:09,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:22:09,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 22:22:09,429 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 22:22:09,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:09,430 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 22:22:09,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:22:09,430 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 22:22:09,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 22:22:09,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:09,432 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:09,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:09,635 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:09,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:09,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-21 22:22:09,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:09,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934913827] [2020-07-21 22:22:09,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:09,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:09,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:09,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:22:09,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:09,818 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 22:22:09,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:11,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:11,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:11,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:11,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:12,746 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 22:22:12,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934913827] [2020-07-21 22:22:12,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:12,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:22:12,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827960687] [2020-07-21 22:22:12,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:22:12,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:12,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:22:12,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:22:12,751 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 22:22:12,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:12,972 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 22:22:12,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:22:12,974 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 22:22:12,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:12,976 INFO L225 Difference]: With dead ends: 43 [2020-07-21 22:22:12,976 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 22:22:12,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:22:12,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 22:22:12,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 22:22:12,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 22:22:12,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 22:22:12,985 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 22:22:12,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:12,986 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 22:22:12,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:22:12,986 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 22:22:12,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 22:22:12,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:12,987 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:13,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:13,189 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:13,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:13,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-21 22:22:13,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:13,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728576161] [2020-07-21 22:22:13,192 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:13,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:13,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:13,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:22:13,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:13,463 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 22:22:13,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:15,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:16,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:17,987 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 22:22:17,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1728576161] [2020-07-21 22:22:17,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:17,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:22:17,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506101420] [2020-07-21 22:22:17,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:22:17,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:17,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:22:17,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:22:17,995 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 22:22:18,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:18,262 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 22:22:18,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:22:18,263 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 22:22:18,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:18,266 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:22:18,266 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 22:22:18,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:22:18,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 22:22:18,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 22:22:18,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 22:22:18,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 22:22:18,278 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 22:22:18,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:18,278 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 22:22:18,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:22:18,279 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 22:22:18,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 22:22:18,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:18,281 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:18,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:18,495 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:18,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:18,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-21 22:22:18,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:18,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447291982] [2020-07-21 22:22:18,498 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:18,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:18,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:18,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:22:18,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:18,803 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-21 22:22:18,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:21,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:21,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:22,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:22,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:23,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:23,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:24,996 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 22:22:24,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447291982] [2020-07-21 22:22:24,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:24,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:22:24,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369558016] [2020-07-21 22:22:24,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:22:24,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:24,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:22:24,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:22:24,999 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 25 states. [2020-07-21 22:22:25,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:25,236 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 22:22:25,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:22:25,237 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 67 [2020-07-21 22:22:25,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:25,239 INFO L225 Difference]: With dead ends: 49 [2020-07-21 22:22:25,239 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 22:22:25,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:22:25,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 22:22:25,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 22:22:25,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:22:25,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 22:22:25,258 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 22:22:25,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:25,262 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 22:22:25,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:22:25,262 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 22:22:25,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 22:22:25,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:25,267 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:25,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:25,469 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:25,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:25,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-21 22:22:25,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:25,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842497400] [2020-07-21 22:22:25,471 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:25,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:25,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:25,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:22:25,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:25,813 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 22:22:25,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:29,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:29,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:31,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:31,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:32,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:32,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:33,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:33,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:34,873 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-21 22:22:34,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [842497400] [2020-07-21 22:22:34,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:34,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:22:34,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75376832] [2020-07-21 22:22:34,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:22:34,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:34,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:22:34,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:22:34,877 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 27 states. [2020-07-21 22:22:35,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:35,264 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-21 22:22:35,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:22:35,266 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 73 [2020-07-21 22:22:35,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:35,270 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:22:35,270 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:22:35,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 98 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:22:35,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:22:35,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 22:22:35,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 22:22:35,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-21 22:22:35,300 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-21 22:22:35,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:35,301 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-21 22:22:35,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:22:35,306 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-21 22:22:35,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 22:22:35,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:35,308 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:35,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:35,523 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:35,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:35,524 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-21 22:22:35,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:35,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795737032] [2020-07-21 22:22:35,525 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:35,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:22:35,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:35,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:22:35,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:36,176 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-21 22:22:36,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:41,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:41,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:43,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:43,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:44,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:44,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:45,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:45,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:46,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:47,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:47,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:47,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:47,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:47,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:48,343 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:22:48,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795737032] [2020-07-21 22:22:48,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:22:48,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:22:48,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829567719] [2020-07-21 22:22:48,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:22:48,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:22:48,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:22:48,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:22:48,346 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 29 states. [2020-07-21 22:22:48,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:22:48,832 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-07-21 22:22:48,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:22:48,834 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2020-07-21 22:22:48,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:22:48,835 INFO L225 Difference]: With dead ends: 55 [2020-07-21 22:22:48,836 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 22:22:48,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 106 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:22:48,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 22:22:48,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-21 22:22:48,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:22:48,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-21 22:22:48,845 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-07-21 22:22:48,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:22:48,846 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-21 22:22:48,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:22:48,846 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-21 22:22:48,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 22:22:48,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:22:48,847 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:22:49,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:49,054 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:22:49,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:22:49,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-07-21 22:22:49,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:22:49,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938045442] [2020-07-21 22:22:49,056 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:22:49,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:22:49,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:22:49,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:22:49,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:22:49,621 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 22:22:49,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:22:51,612 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:22:52,193 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 22:22:56,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:56,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:59,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:22:59,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:01,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:01,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:03,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:04,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:05,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:05,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:06,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:06,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:07,878 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:23:07,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938045442] [2020-07-21 22:23:07,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:23:07,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 22:23:07,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608592971] [2020-07-21 22:23:07,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 22:23:07,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:23:07,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 22:23:07,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 22:23:07,881 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 31 states. [2020-07-21 22:23:08,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:23:08,282 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-07-21 22:23:08,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 22:23:08,283 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 85 [2020-07-21 22:23:08,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:23:08,285 INFO L225 Difference]: With dead ends: 58 [2020-07-21 22:23:08,285 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 22:23:08,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 114 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 22:23:08,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 22:23:08,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-21 22:23:08,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 22:23:08,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-07-21 22:23:08,295 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-07-21 22:23:08,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:23:08,296 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-07-21 22:23:08,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 22:23:08,296 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-07-21 22:23:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 22:23:08,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:23:08,297 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:23:08,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:23:08,504 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:23:08,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:23:08,505 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-07-21 22:23:08,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:23:08,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639943248] [2020-07-21 22:23:08,506 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:23:08,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:23:08,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:23:08,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 22:23:08,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:23:09,248 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-21 22:23:09,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:23:11,289 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:11,685 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:11,809 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:11,936 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 22:23:12,061 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 22:23:12,183 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 22:23:12,292 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-21 22:23:12,398 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 22:23:12,504 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-21 22:23:12,608 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 22:23:15,086 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 22:23:15,764 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:15,867 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:15,976 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:16,082 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:16,198 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:16,316 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:16,434 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:16,553 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:16,673 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 22:23:16,784 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-21 22:23:16,891 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 22:23:17,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:19,969 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:20,074 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:20,184 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:20,292 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:20,406 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:20,515 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:20,622 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 22:23:20,725 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 22:23:21,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:21,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:23,583 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:23,787 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:23,892 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:24,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:24,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:27,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:29,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:30,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:30,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:31,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:31,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:32,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:32,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:32,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:32,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:33,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:34,076 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-07-21 22:23:34,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639943248] [2020-07-21 22:23:34,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:23:34,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-21 22:23:34,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468894206] [2020-07-21 22:23:34,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-21 22:23:34,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:23:34,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-21 22:23:34,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 22:23:34,080 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 33 states. [2020-07-21 22:23:34,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:23:34,851 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-07-21 22:23:34,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 22:23:34,855 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 91 [2020-07-21 22:23:34,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:23:34,856 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:23:34,856 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:23:34,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 122 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 22:23:34,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:23:34,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 22:23:34,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 22:23:34,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-21 22:23:34,864 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-07-21 22:23:34,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:23:34,865 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-21 22:23:34,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-21 22:23:34,865 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-21 22:23:34,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-21 22:23:34,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:23:34,867 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:23:35,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:23:35,072 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:23:35,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:23:35,073 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-07-21 22:23:35,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:23:35,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593990908] [2020-07-21 22:23:35,075 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:23:35,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:23:35,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:23:35,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 22:23:35,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:23:36,125 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-21 22:23:36,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:23:38,201 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:38,312 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:38,428 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:38,538 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:38,658 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:38,776 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:38,901 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:39,024 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:39,155 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:39,284 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:39,424 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:39,568 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:39,716 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:39,860 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:40,010 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 22:23:40,159 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 22:23:40,326 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 22:23:40,486 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 22:23:40,653 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 22:23:40,844 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 22:23:41,007 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 22:23:41,160 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2020-07-21 22:23:41,306 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 22:23:41,442 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-21 22:23:41,578 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 22:23:41,708 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-21 22:23:41,827 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 22:23:41,945 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 22:23:42,055 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 22:23:42,164 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 22:23:45,018 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:45,120 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:45,421 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:45,545 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:45,670 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:45,808 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:45,930 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:46,044 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:46,189 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:46,308 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:46,441 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:46,576 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:46,725 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:46,881 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:47,046 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 22:23:47,203 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 22:23:47,363 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 22:23:47,513 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 22:23:47,652 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 22:23:47,784 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 22:23:47,914 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 22:23:48,038 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 22:23:48,157 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 22:23:48,268 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 22:23:49,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:49,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:51,098 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 22:23:51,210 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:51,322 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:51,439 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:51,582 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:51,706 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:51,827 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:51,952 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:52,072 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:52,197 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:52,322 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:52,451 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:52,580 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:23:52,717 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:52,853 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:23:52,984 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 22:23:53,121 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-21 22:23:53,279 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 22:23:53,422 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-21 22:23:53,556 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 22:23:53,672 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 22:23:53,789 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 22:23:53,899 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 22:23:54,005 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:54,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:54,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:56,566 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 22:23:56,675 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 22:23:56,786 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 22:23:56,907 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 22:23:57,040 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 22:23:57,169 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 22:23:57,307 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:57,441 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:23:57,582 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:57,724 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 22:23:57,879 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:58,051 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 22:23:58,208 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:58,365 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 22:23:58,532 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:58,701 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 22:23:59,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:23:59,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:03,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:03,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:05,012 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 22:24:05,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:05,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:07,616 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 22:24:07,731 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 22:24:07,855 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 22:24:07,978 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 22:24:08,105 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 22:24:08,221 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 22:24:08,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:08,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:10,714 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 22:24:10,822 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 22:24:11,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:13,189 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 22:24:13,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:15,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:15,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:16,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:16,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:17,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:17,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:18,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:18,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:18,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:18,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:24:18,653 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-07-21 22:24:18,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593990908] [2020-07-21 22:24:18,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:24:18,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33] total 34 [2020-07-21 22:24:18,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794748960] [2020-07-21 22:24:18,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 22:24:18,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:24:18,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 22:24:18,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 22:24:18,656 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 34 states. [2020-07-21 22:24:20,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:24:20,401 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-07-21 22:24:20,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 22:24:20,408 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 97 [2020-07-21 22:24:20,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:24:20,410 INFO L225 Difference]: With dead ends: 64 [2020-07-21 22:24:20,410 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:24:20,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 130 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 22:24:20,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:24:20,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-21 22:24:20,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 22:24:20,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-21 22:24:20,419 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-07-21 22:24:20,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:24:20,420 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-21 22:24:20,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 22:24:20,420 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-21 22:24:20,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-21 22:24:20,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:24:20,422 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:24:20,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:24:20,637 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:24:20,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:24:20,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-07-21 22:24:20,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:24:20,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732828747] [2020-07-21 22:24:20,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:24:21,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:24:21,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:24:21,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 22:24:21,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:24:23,972 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:24:23,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:24:32,278 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 22:24:32,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732828747] [2020-07-21 22:24:32,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:24:32,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2020-07-21 22:24:32,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844797117] [2020-07-21 22:24:32,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 22:24:32,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:24:32,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 22:24:32,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:24:32,283 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2020-07-21 22:24:34,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:24:34,463 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-07-21 22:24:34,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-21 22:24:34,468 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2020-07-21 22:24:34,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:24:34,470 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:24:34,470 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:24:34,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:24:34,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:24:34,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-07-21 22:24:34,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 22:24:34,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-07-21 22:24:34,479 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-07-21 22:24:34,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:24:34,480 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-07-21 22:24:34,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 22:24:34,480 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-07-21 22:24:34,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:24:34,481 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:24:34,481 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:24:34,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:24:34,690 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:24:34,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:24:34,691 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-07-21 22:24:34,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:24:34,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868192207] [2020-07-21 22:24:34,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:24:35,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:24:35,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:24:35,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 22:24:35,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:24:36,157 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-07-21 22:24:36,157 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:24:36,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868192207] [2020-07-21 22:24:36,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:24:36,158 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2020-07-21 22:24:36,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795061234] [2020-07-21 22:24:36,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:24:36,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:24:36,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:24:36,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:24:36,160 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2020-07-21 22:24:36,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:24:36,963 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2020-07-21 22:24:36,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 22:24:36,969 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2020-07-21 22:24:36,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:24:36,970 INFO L225 Difference]: With dead ends: 63 [2020-07-21 22:24:36,971 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:24:36,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:24:36,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:24:36,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:24:36,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:24:36,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:24:36,973 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 109 [2020-07-21 22:24:36,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:24:36,974 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:24:36,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:24:36,974 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:24:36,974 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:24:37,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:24:37,185 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:24:37,325 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:24:37,325 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:24:37,326 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:24:37,326 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:24:37,326 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:24:37,326 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:24:37,328 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-07-21 22:24:37,328 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point L12(lines 12 14) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= 15 main_~input~0) (<= main_~input~0 15)) [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2020-07-21 22:24:37,329 INFO L268 CegarLoopResult]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2020-07-21 22:24:37,330 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2020-07-21 22:24:37,330 INFO L264 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-21 22:24:37,330 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-21 22:24:37,330 INFO L268 CegarLoopResult]: For program point L6-1(line 6) no Hoare annotation was computed. [2020-07-21 22:24:37,339 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:24:37 BoogieIcfgContainer [2020-07-21 22:24:37,339 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:24:37,341 INFO L168 Benchmark]: Toolchain (without parser) took 158422.54 ms. Allocated memory was 137.4 MB in the beginning and 544.7 MB in the end (delta: 407.4 MB). Free memory was 101.8 MB in the beginning and 235.9 MB in the end (delta: -134.1 MB). Peak memory consumption was 273.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,342 INFO L168 Benchmark]: CDTParser took 0.46 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,342 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.91 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 92.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,343 INFO L168 Benchmark]: Boogie Preprocessor took 36.97 ms. Allocated memory is still 137.4 MB. Free memory was 92.3 MB in the beginning and 91.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,343 INFO L168 Benchmark]: RCFGBuilder took 444.24 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.0 MB in the beginning and 169.7 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,343 INFO L168 Benchmark]: TraceAbstraction took 157672.74 ms. Allocated memory was 201.3 MB in the beginning and 544.7 MB in the end (delta: 343.4 MB). Free memory was 169.0 MB in the beginning and 235.9 MB in the end (delta: -66.9 MB). Peak memory consumption was 276.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:24:37,345 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.46 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 260.91 ms. Allocated memory is still 137.4 MB. Free memory was 101.6 MB in the beginning and 92.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 36.97 ms. Allocated memory is still 137.4 MB. Free memory was 92.3 MB in the beginning and 91.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 444.24 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 91.0 MB in the beginning and 169.7 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 157672.74 ms. Allocated memory was 201.3 MB in the beginning and 544.7 MB in the end (delta: 343.4 MB). Free memory was 169.0 MB in the beginning and 235.9 MB in the end (delta: -66.9 MB). Peak memory consumption was 276.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 157.4s, OverallIterations: 17, TraceHistogramMax: 17, AutomataDifference: 8.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 285 SDtfs, 1548 SDslu, 2904 SDs, 0 SdLazy, 1632 SolverSat, 655 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2072 GetRequests, 1362 SyntacticMatches, 239 SemanticMatches, 471 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 15.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 17 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 140.7s InterpolantComputationTime, 1037 NumberOfCodeBlocks, 685 NumberOfCodeBlocksAsserted, 43 NumberOfCheckSat, 1920 ConstructedInterpolants, 0 QuantifiedInterpolants, 399960 SizeOfPredicates, 153 NumberOfNonLiveVariables, 1643 ConjunctsInSsa, 373 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 3609/8464 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...