/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/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:39:24,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 00:39:24,679 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 00:39:24,693 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 00:39:24,693 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 00:39:24,694 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 00:39:24,696 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 00:39:24,698 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 00:39:24,699 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 00:39:24,700 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 00:39:24,701 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 00:39:24,702 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 00:39:24,703 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:39:24,704 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:39:24,705 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:39:24,706 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:39:24,707 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:39:24,708 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:39:24,710 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:39:24,712 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:39:24,713 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:39:24,714 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:39:24,715 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:39:24,716 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:39:24,719 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:39:24,730 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 00:39:24,746 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:39:24,746 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:39:24,748 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:39:24,748 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:39:24,748 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:39:24,748 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:39:24,749 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:39:24,749 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:39:24,749 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:39:24,749 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:39:24,750 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:39:24,750 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:39:24,750 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:39:24,750 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:39:24,750 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:39:24,751 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:39:24,751 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:39:24,751 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:39:24,751 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:39:24,752 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:39:24,752 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:39:24,752 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:39:24,752 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:39:24,752 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:39:24,753 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:39:24,753 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:39:24,753 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:24,753 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:39:24,753 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:39:24,754 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 00:39:25,103 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:39:25,126 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:39:25,130 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:39:25,132 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:39:25,132 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:39:25,133 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 00:39:25,205 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00bd12a42/2744703bc16148e6bb89ab052d3a2aa3/FLAG028cc16b5 [2020-07-21 00:39:25,730 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:39:25,731 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 00:39:25,740 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00bd12a42/2744703bc16148e6bb89ab052d3a2aa3/FLAG028cc16b5 [2020-07-21 00:39:26,064 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/00bd12a42/2744703bc16148e6bb89ab052d3a2aa3 [2020-07-21 00:39:26,080 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:39:26,084 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:39:26,087 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:39:26,087 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:39:26,091 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:39:26,092 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,096 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c2043f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26, skipping insertion in model container [2020-07-21 00:39:26,096 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,105 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:39:26,126 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:39:26,299 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:39:26,306 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:39:26,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:39:26,334 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:39:26,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26 WrapperNode [2020-07-21 00:39:26,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:39:26,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:39:26,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:39:26,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:39:26,347 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,356 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,360 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,361 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (1/1) ... [2020-07-21 00:39:26,362 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:39:26,363 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:39:26,363 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:39:26,363 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:39:26,366 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (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 00:39:26,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:39:26,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:39:26,541 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:39:26,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:39:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:39:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:39:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:39:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:39:26,542 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:39:26,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:39:26,740 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:39:26,740 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:39:26,747 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:39:26 BoogieIcfgContainer [2020-07-21 00:39:26,747 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:39:26,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:39:26,750 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:39:26,753 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:39:26,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:39:26" (1/3) ... [2020-07-21 00:39:26,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578fe133 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:39:26, skipping insertion in model container [2020-07-21 00:39:26,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:39:26" (2/3) ... [2020-07-21 00:39:26,755 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578fe133 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:39:26, skipping insertion in model container [2020-07-21 00:39:26,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:39:26" (3/3) ... [2020-07-21 00:39:26,757 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-21 00:39:26,766 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:39:26,776 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:39:26,792 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:39:26,818 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:39:26,819 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:39:26,819 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:39:26,819 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:39:26,820 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:39:26,820 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:39:26,820 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:39:26,820 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:39:26,840 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:39:26,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:39:26,846 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:26,848 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:26,848 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:26,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:26,854 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:39:26,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:26,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165577460] [2020-07-21 00:39:26,862 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 00:39:26,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:26,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:26,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:39:26,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:27,057 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 00:39:27,058 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:39:27,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165577460] [2020-07-21 00:39:27,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:39:27,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:39:27,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940978158] [2020-07-21 00:39:27,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:39:27,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:27,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:39:27,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:39:27,090 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:39:27,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:27,201 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:39:27,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:39:27,204 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:39:27,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:27,216 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:39:27,216 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:39:27,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:39:27,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:39:27,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:39:27,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:39:27,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:39:27,274 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:39:27,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:27,275 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:39:27,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:39:27,275 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:39:27,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:39:27,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:27,278 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:27,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:27,492 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:27,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:27,493 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:39:27,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:27,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768601354] [2020-07-21 00:39:27,494 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 00:39:27,522 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:39:27,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:27,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:39:27,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:27,569 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 00:39:27,570 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:39:27,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768601354] [2020-07-21 00:39:27,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:39:27,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:39:27,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148414524] [2020-07-21 00:39:27,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:39:27,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:27,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:39:27,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:39:27,575 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:39:27,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:27,635 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:39:27,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:39:27,636 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:39:27,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:27,638 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:39:27,638 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:39:27,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 00:39:27,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:39:27,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:39:27,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:39:27,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:39:27,649 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:39:27,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:27,649 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:39:27,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:39:27,650 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:39:27,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:39:27,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:27,651 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:27,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:27,867 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:27,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:27,868 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:39:27,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:27,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960956561] [2020-07-21 00:39:27,870 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 00:39:27,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:27,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:27,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:39:27,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:27,964 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 00:39:27,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:28,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:28,204 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:39:28,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960956561] [2020-07-21 00:39:28,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:28,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:39:28,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345500175] [2020-07-21 00:39:28,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:39:28,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:28,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:39:28,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:39:28,208 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:39:28,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:28,338 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:39:28,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:39:28,339 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:39:28,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:28,341 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:39:28,341 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:39:28,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:39:28,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:39:28,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:39:28,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:39:28,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:39:28,353 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:39:28,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:28,354 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:39:28,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:39:28,354 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:39:28,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:39:28,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:28,356 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:28,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:28,570 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:28,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:28,571 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:39:28,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:28,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652660100] [2020-07-21 00:39:28,573 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 00:39:28,605 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:28,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:28,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:39:28,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:28,663 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 00:39:28,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:28,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:28,834 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 00:39:28,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652660100] [2020-07-21 00:39:28,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:28,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:39:28,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232469867] [2020-07-21 00:39:28,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:39:28,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:28,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:39:28,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:39:28,838 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:39:28,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:28,916 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:39:28,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:39:28,916 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:39:28,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:28,918 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:39:28,919 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:39:28,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:39:28,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:39:28,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:39:28,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:39:28,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:39:28,929 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:39:28,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:28,929 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:39:28,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:39:28,929 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:39:28,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:39:28,931 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:28,931 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:29,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:29,140 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:29,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:29,141 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:39:29,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:29,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736044123] [2020-07-21 00:39:29,143 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 00:39:29,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:29,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:29,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:39:29,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:29,238 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 00:39:29,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:29,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:29,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:29,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:29,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:29,666 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:39:29,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736044123] [2020-07-21 00:39:29,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:29,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:39:29,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952674719] [2020-07-21 00:39:29,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:39:29,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:29,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:39:29,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:39:29,670 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:39:29,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:29,853 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:39:29,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:39:29,854 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:39:29,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:29,856 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:39:29,856 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:39:29,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 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 00:39:29,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:39:29,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:39:29,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:39:29,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:39:29,868 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:39:29,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:29,868 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:39:29,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:39:29,868 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:39:29,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:39:29,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:29,871 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:30,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:30,083 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:30,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:30,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:39:30,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:30,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [193663943] [2020-07-21 00:39:30,085 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 00:39:30,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:30,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:30,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:39:30,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:30,176 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 00:39:30,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:30,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:30,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:30,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:30,507 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 00:39:30,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [193663943] [2020-07-21 00:39:30,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:30,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:39:30,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111995934] [2020-07-21 00:39:30,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:39:30,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:30,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:39:30,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:39:30,511 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:39:30,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:30,643 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:39:30,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:39:30,643 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:39:30,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:30,646 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:39:30,646 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:39:30,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 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 00:39:30,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:39:30,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:39:30,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:39:30,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:39:30,677 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:39:30,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:30,678 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:39:30,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:39:30,679 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:39:30,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:39:30,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:30,684 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:30,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:30,886 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:30,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:30,886 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:39:30,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:30,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301415938] [2020-07-21 00:39:30,887 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 00:39:30,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:39:30,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:30,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:39:30,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:30,983 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 00:39:30,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:31,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:31,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:31,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:31,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:31,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:31,633 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 00:39:31,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301415938] [2020-07-21 00:39:31,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:31,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:39:31,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274823509] [2020-07-21 00:39:31,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:39:31,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:31,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:39:31,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:39:31,638 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:39:31,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:31,798 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:39:31,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:39:31,798 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:39:31,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:31,801 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:39:31,801 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:39:31,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:39:31,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:39:31,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:39:31,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:39:31,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:39:31,814 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:39:31,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:31,815 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:39:31,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:39:31,815 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:39:31,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:39:31,817 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:31,818 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:32,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:32,032 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:32,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:32,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:39:32,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:32,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431408264] [2020-07-21 00:39:32,035 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 00:39:32,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:32,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:32,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:39:32,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:32,151 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 00:39:32,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:32,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:32,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:32,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:32,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:32,796 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 00:39:32,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431408264] [2020-07-21 00:39:32,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:32,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:39:32,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128653086] [2020-07-21 00:39:32,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:39:32,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:32,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:39:32,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:39:32,799 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 00:39:32,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:32,954 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:39:32,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:39:32,957 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 00:39:32,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:32,959 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:39:32,959 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:39:32,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:39:32,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:39:32,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:39:32,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:39:32,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:39:32,974 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:39:32,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:32,975 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:39:32,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:39:32,975 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:39:32,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:39:32,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:32,980 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:33,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:33,182 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:33,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:33,183 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:39:33,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:33,184 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52626452] [2020-07-21 00:39:33,185 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 00:39:33,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:33,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:33,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:39:33,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:33,343 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 00:39:33,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:33,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:33,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:34,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:34,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:34,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:34,313 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 00:39:34,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52626452] [2020-07-21 00:39:34,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:34,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:39:34,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971865237] [2020-07-21 00:39:34,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:39:34,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:34,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:39:34,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:39:34,316 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 00:39:34,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:34,608 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:39:34,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:39:34,609 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 00:39:34,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:34,615 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:39:34,615 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:39:34,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 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 00:39:34,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:39:34,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:39:34,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:39:34,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:39:34,629 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:39:34,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:34,630 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:39:34,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:39:34,630 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:39:34,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:39:34,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:34,633 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:34,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:34,840 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:34,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:34,840 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:39:34,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:34,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223837157] [2020-07-21 00:39:34,842 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 00:39:34,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:34,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:34,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:39:34,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:35,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 00:39:35,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:35,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:35,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:36,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:36,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:36,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:36,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:36,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 00:39:36,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223837157] [2020-07-21 00:39:36,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:36,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:39:36,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193209790] [2020-07-21 00:39:36,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:39:36,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:36,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:39:36,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:39:36,177 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 00:39:36,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:36,340 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 00:39:36,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:39:36,340 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 00:39:36,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:36,343 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:39:36,343 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 00:39:36,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 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 00:39:36,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 00:39:36,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 00:39:36,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:39:36,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:39:36,357 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 00:39:36,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:36,358 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:39:36,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:39:36,359 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:39:36,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:39:36,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:36,363 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:36,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:36,579 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:36,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:36,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 00:39:36,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:36,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492689112] [2020-07-21 00:39:36,581 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 00:39:36,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:36,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:36,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:39:36,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:36,808 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 00:39:36,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:38,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:38,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 00:39:38,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492689112] [2020-07-21 00:39:38,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:38,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:39:38,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075693841] [2020-07-21 00:39:38,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:39:38,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:38,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:39:38,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:39:38,728 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 00:39:38,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:38,947 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 00:39:38,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:39:38,948 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 00:39:38,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:38,954 INFO L225 Difference]: With dead ends: 72 [2020-07-21 00:39:38,955 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:39:38,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:39:38,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:39:38,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 00:39:38,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:39:38,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:39:38,979 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 00:39:38,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:38,981 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:39:38,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:39:38,981 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:39:38,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 00:39:38,988 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:38,989 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:39,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:39,204 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:39,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:39,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 00:39:39,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:39,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1090036031] [2020-07-21 00:39:39,207 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 00:39:39,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:39,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:39,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:39:39,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:39,439 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 00:39:39,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:40,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:41,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 00:39:41,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1090036031] [2020-07-21 00:39:41,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:41,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:39:41,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026735538] [2020-07-21 00:39:41,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:39:41,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:41,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:39:41,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:39:41,393 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 00:39:41,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:41,608 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 00:39:41,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:39:41,609 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 00:39:41,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:41,612 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:39:41,612 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 00:39:41,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:39:41,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 00:39:41,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 00:39:41,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:39:41,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:39:41,625 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 00:39:41,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:41,626 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:39:41,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:39:41,626 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:39:41,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 00:39:41,638 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:41,638 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:41,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:41,854 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:41,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:41,855 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 00:39:41,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:41,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275354935] [2020-07-21 00:39:41,856 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 00:39:42,023 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:42,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:42,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:39:42,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:42,325 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 00:39:42,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:44,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:44,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:45,705 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 00:39:45,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275354935] [2020-07-21 00:39:45,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:45,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:39:45,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764693829] [2020-07-21 00:39:45,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:39:45,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:45,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:39:45,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:39:45,708 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 00:39:46,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:46,187 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 00:39:46,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:39:46,188 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 00:39:46,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:46,196 INFO L225 Difference]: With dead ends: 82 [2020-07-21 00:39:46,196 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:39:46,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 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 00:39:46,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:39:46,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 00:39:46,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:39:46,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:39:46,228 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 00:39:46,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:46,230 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:39:46,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:39:46,231 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:39:46,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 00:39:46,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:46,235 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:46,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:46,437 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:46,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:46,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 00:39:46,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:46,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784516328] [2020-07-21 00:39:46,439 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 00:39:46,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:46,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:46,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:39:46,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:46,748 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 00:39:46,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:48,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:49,967 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 00:39:49,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784516328] [2020-07-21 00:39:49,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:49,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:39:49,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084148031] [2020-07-21 00:39:49,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:39:49,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:49,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:39:49,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:39:49,970 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 00:39:50,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:50,225 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 00:39:50,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:39:50,226 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 00:39:50,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:50,230 INFO L225 Difference]: With dead ends: 87 [2020-07-21 00:39:50,230 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 00:39:50,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 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 00:39:50,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 00:39:50,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 00:39:50,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:39:50,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:39:50,253 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 00:39:50,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:50,254 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:39:50,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:39:50,254 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:39:50,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 00:39:50,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:50,268 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:50,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:50,481 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:50,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:50,482 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 00:39:50,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:50,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088889515] [2020-07-21 00:39:50,484 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 00:39:50,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:50,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:50,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:39:50,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:51,521 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 00:39:51,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:55,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:55,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:56,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:56,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:56,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:57,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:58,215 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 00:39:58,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088889515] [2020-07-21 00:39:58,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:58,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:39:58,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250242700] [2020-07-21 00:39:58,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:39:58,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:58,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:39:58,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:39:58,220 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 00:39:58,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:58,830 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 00:39:58,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:39:58,831 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 00:39:58,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:58,839 INFO L225 Difference]: With dead ends: 92 [2020-07-21 00:39:58,839 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 00:39:58,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:39:58,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 00:39:58,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 00:39:58,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:39:58,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:39:58,869 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 00:39:58,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:58,871 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:39:58,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:39:58,872 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:39:58,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-21 00:39:58,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:58,880 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:59,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:59,096 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:59,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:59,097 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-21 00:39:59,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:59,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [243493236] [2020-07-21 00:39:59,097 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 00:39:59,292 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:59,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:59,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:39:59,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:59,620 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-21 00:39:59,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:40:02,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:02,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:04,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:04,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:04,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:04,528 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-21 00:40:04,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [243493236] [2020-07-21 00:40:04,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:40:04,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:40:04,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076637434] [2020-07-21 00:40:04,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:40:04,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:40:04,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:40:04,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:40:04,532 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 00:40:05,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:40:05,136 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 00:40:05,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:40:05,136 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-21 00:40:05,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:40:05,141 INFO L225 Difference]: With dead ends: 97 [2020-07-21 00:40:05,141 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 00:40:05,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 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 00:40:05,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 00:40:05,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 00:40:05,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:40:05,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:40:05,160 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-21 00:40:05,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:40:05,162 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:40:05,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:40:05,162 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:40:05,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-21 00:40:05,182 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:40:05,183 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:40:05,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:05,399 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:40:05,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:40:05,400 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-21 00:40:05,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:40:05,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531922043] [2020-07-21 00:40:05,401 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 00:40:05,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:40:05,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:40:05,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:40:05,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:40:06,832 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-21 00:40:06,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:40:11,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:13,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:14,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:14,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:14,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:14,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:14,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:15,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:15,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:15,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:15,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:15,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:16,046 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-21 00:40:16,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531922043] [2020-07-21 00:40:16,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:40:16,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:40:16,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723018876] [2020-07-21 00:40:16,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:40:16,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:40:16,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:40:16,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:40:16,050 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 00:40:16,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:40:16,804 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 00:40:16,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:40:16,805 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-21 00:40:16,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:40:16,811 INFO L225 Difference]: With dead ends: 102 [2020-07-21 00:40:16,811 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 00:40:16,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:40:16,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 00:40:16,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 00:40:16,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:40:16,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:40:16,829 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-21 00:40:16,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:40:16,830 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:40:16,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:40:16,831 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:40:16,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-21 00:40:16,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:40:16,876 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:40:17,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:17,092 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:40:17,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:40:17,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-21 00:40:17,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:40:17,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954267594] [2020-07-21 00:40:17,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:17,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:40:17,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:40:17,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 1007 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:40:17,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:40:19,116 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-21 00:40:19,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:40:25,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:27,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:28,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:28,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:29,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:31,232 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-21 00:40:31,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954267594] [2020-07-21 00:40:31,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:40:31,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:40:31,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721490948] [2020-07-21 00:40:31,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:40:31,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:40:31,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:40:31,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:40:31,236 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 00:40:31,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:40:31,949 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 00:40:31,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:40:31,950 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1820 [2020-07-21 00:40:31,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:40:31,956 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:40:31,957 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 00:40:31,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:40:31,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 00:40:31,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 00:40:31,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:40:31,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:40:31,974 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-21 00:40:31,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:40:31,976 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:40:31,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:40:31,976 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:40:32,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-21 00:40:32,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:40:32,019 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:40:32,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:32,234 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:40:32,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:40:32,236 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-21 00:40:32,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:40:32,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238173551] [2020-07-21 00:40:32,236 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:32,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:40:32,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:40:32,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:40:32,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:40:35,447 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-21 00:40:35,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:40:42,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:45,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:47,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:48,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:48,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:49,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:51,331 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-21 00:40:51,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238173551] [2020-07-21 00:40:51,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:40:51,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:40:51,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889515207] [2020-07-21 00:40:51,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:40:51,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:40:51,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:40:51,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:40:51,336 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 00:40:52,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:40:52,320 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 00:40:52,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:40:52,321 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-21 00:40:52,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:40:52,328 INFO L225 Difference]: With dead ends: 112 [2020-07-21 00:40:52,328 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 00:40:52,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:40:52,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 00:40:52,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 00:40:52,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:40:52,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:40:52,348 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-21 00:40:52,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:40:52,350 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:40:52,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:40:52,350 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:40:52,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3145 [2020-07-21 00:40:52,458 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:40:52,459 INFO L422 BasicCegarLoop]: trace histogram [461, 461, 371, 230, 230, 230, 230, 230, 230, 230, 141, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:40:52,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:52,673 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:40:52,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:40:52,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1076189233, now seen corresponding path program 9 times [2020-07-21 00:40:52,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:40:52,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581406857] [2020-07-21 00:40:52,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:53,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:40:53,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:40:53,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 1742 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:40:53,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:40:57,227 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22265 refuted. 0 times theorem prover too weak. 572801 trivial. 0 not checked. [2020-07-21 00:40:57,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:41:06,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:11,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:14,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:14,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:16,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:16,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:21,067 INFO L134 CoverageAnalysis]: Checked inductivity of 598095 backedges. 3029 proven. 22391 refuted. 0 times theorem prover too weak. 572675 trivial. 0 not checked. [2020-07-21 00:41:21,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581406857] [2020-07-21 00:41:21,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:41:21,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:41:21,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354786070] [2020-07-21 00:41:21,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:41:21,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:41:21,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:41:21,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:41:21,072 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 00:41:21,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:41:21,942 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 00:41:21,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:41:21,943 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3144 [2020-07-21 00:41:21,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:41:21,951 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:41:21,951 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 00:41:21,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6297 GetRequests, 6244 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 00:41:21,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 00:41:21,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 00:41:21,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:41:21,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:41:21,974 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3144 [2020-07-21 00:41:21,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:41:21,977 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:41:21,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:41:21,977 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:41:22,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 00:41:22,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:41:22,105 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:41:22,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:41:22,307 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:41:22,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:41:22,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 00:41:22,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:41:22,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800305897] [2020-07-21 00:41:22,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:41:23,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:41:23,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:41:23,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 2216 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:41:23,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:41:28,907 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 00:41:28,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:41:43,572 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:41:43,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:43,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:50,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:53,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:55,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:56,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:57,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:57,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:58,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:58,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:58,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:58,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:04,522 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 00:42:04,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800305897] [2020-07-21 00:42:04,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:42:04,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:42:04,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323298101] [2020-07-21 00:42:04,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:42:04,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:42:04,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:42:04,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:42:04,528 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 00:42:05,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:42:05,590 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 00:42:05,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:42:05,595 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 00:42:05,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:42:05,604 INFO L225 Difference]: With dead ends: 122 [2020-07-21 00:42:05,604 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 00:42:05,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:42:05,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 00:42:05,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 00:42:05,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:42:05,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:42:05,627 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 00:42:05,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:42:05,630 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:42:05,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:42:05,630 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:42:05,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3877 [2020-07-21 00:42:05,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:42:05,752 INFO L422 BasicCegarLoop]: trace histogram [569, 569, 455, 284, 284, 284, 284, 284, 284, 284, 171, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:42:05,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:42:05,954 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:42:05,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:42:05,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1124129157, now seen corresponding path program 10 times [2020-07-21 00:42:05,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:42:05,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574731393] [2020-07-21 00:42:05,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:42:06,796 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:42:06,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:42:06,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 2149 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:42:06,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:42:12,154 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30601 refuted. 0 times theorem prover too weak. 875910 trivial. 0 not checked. [2020-07-21 00:42:12,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:42:25,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:32,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:32,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:36,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:36,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:38,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:38,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:39,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:39,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:40,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:41,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:42:46,509 INFO L134 CoverageAnalysis]: Checked inductivity of 910413 backedges. 3902 proven. 30756 refuted. 0 times theorem prover too weak. 875755 trivial. 0 not checked. [2020-07-21 00:42:46,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574731393] [2020-07-21 00:42:46,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:42:46,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:42:46,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861637940] [2020-07-21 00:42:46,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:42:46,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:42:46,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:42:46,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:42:46,515 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 00:42:47,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:42:47,964 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 00:42:47,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:42:47,967 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3876 [2020-07-21 00:42:47,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:42:47,977 INFO L225 Difference]: With dead ends: 127 [2020-07-21 00:42:47,977 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 00:42:47,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7762 GetRequests, 7704 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 00:42:47,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 00:42:48,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 00:42:48,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:42:48,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:42:48,012 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3876 [2020-07-21 00:42:48,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:42:48,016 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:42:48,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:42:48,017 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:42:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14041 [2020-07-21 00:42:49,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:42:49,345 INFO L422 BasicCegarLoop]: trace histogram [2159, 2159, 1080, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1079, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:42:49,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:42:49,546 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:42:49,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:42:49,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1760661492, now seen corresponding path program 11 times [2020-07-21 00:42:49,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:42:49,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325965404] [2020-07-21 00:42:49,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:42:51,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:42:51,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:42:51,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 7831 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:42:51,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:43:58,313 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123136 refuted. 0 times theorem prover too weak. 12089820 trivial. 0 not checked. [2020-07-21 00:43:58,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:45:03,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:29,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:39,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:39,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:42,550 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:45:47,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:47,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:51,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:53,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:53,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:54,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:55,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:55,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:00,249 INFO L134 CoverageAnalysis]: Checked inductivity of 12226149 backedges. 13193 proven. 123312 refuted. 0 times theorem prover too weak. 12089644 trivial. 0 not checked. [2020-07-21 00:47:00,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325965404] [2020-07-21 00:47:00,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:47:00,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:47:00,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754362667] [2020-07-21 00:47:00,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:47:00,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:47:00,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:47:00,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:47:00,262 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 00:47:01,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:47:01,868 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 00:47:01,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:47:01,870 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 14040 [2020-07-21 00:47:01,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:47:01,888 INFO L225 Difference]: With dead ends: 132 [2020-07-21 00:47:01,888 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 00:47:01,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28092 GetRequests, 28029 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 00:47:01,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 00:47:01,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 00:47:01,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:47:01,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:47:01,911 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 14040 [2020-07-21 00:47:01,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:47:01,919 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:47:01,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:47:01,920 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:47:02,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5551 [2020-07-21 00:47:02,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:47:02,318 INFO L422 BasicCegarLoop]: trace histogram [815, 815, 653, 407, 407, 407, 407, 407, 407, 407, 246, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:47:02,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:02,533 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:47:02,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:47:02,535 INFO L82 PathProgramCache]: Analyzing trace with hash -816701340, now seen corresponding path program 11 times [2020-07-21 00:47:02,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:47:02,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875744247] [2020-07-21 00:47:02,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:47:04,031 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:47:04,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:47:04,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 3078 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:47:04,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:47:13,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1870182 backedges. 5220 proven. 49101 refuted. 0 times theorem prover too weak. 1815861 trivial. 0 not checked. [2020-07-21 00:47:13,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:47:37,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:37,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:44,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:50,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:50,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:53,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:53,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:55,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:55,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:56,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:56,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:47:57,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:48:07,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1870182 backedges. 5220 proven. 49288 refuted. 0 times theorem prover too weak. 1815674 trivial. 0 not checked. [2020-07-21 00:48:07,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875744247] [2020-07-21 00:48:07,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:48:07,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:48:07,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076077523] [2020-07-21 00:48:07,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:48:07,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:48:07,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:48:07,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:48:07,168 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 00:48:08,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:48:08,801 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 00:48:08,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:48:08,802 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5550 [2020-07-21 00:48:08,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:48:08,810 INFO L225 Difference]: With dead ends: 137 [2020-07-21 00:48:08,810 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 00:48:08,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11111 GetRequests, 11048 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:48:08,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 00:48:08,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 00:48:08,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:48:08,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:48:08,835 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5550 [2020-07-21 00:48:08,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:48:08,838 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:48:08,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:48:08,838 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:48:10,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15991 [2020-07-21 00:48:10,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:48:10,427 INFO L422 BasicCegarLoop]: trace histogram [2459, 2459, 1230, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:48:10,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:48:10,628 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:48:10,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:48:10,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1271474258, now seen corresponding path program 12 times [2020-07-21 00:48:10,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:48:10,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51647203] [2020-07-21 00:48:10,634 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:48:13,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:48:13,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:48:13,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 8912 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 00:48:13,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:49:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 15861474 backedges. 16307 proven. 152461 refuted. 0 times theorem prover too weak. 15692706 trivial. 0 not checked. [2020-07-21 00:49:27,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:50:17,639 WARN L193 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:51:01,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:32,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:32,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:48,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:51:48,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:03,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:03,651 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:52:08,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:12,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:15,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:16,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:16,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:16,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:16,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:16,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:52:17,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts