/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_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 00:36:19,911 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 00:36:19,942 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 00:36:19,952 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 00:36:19,953 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 00:36:19,956 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 00:36:19,957 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 00:36:19,961 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 00:36:19,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 00:36:19,965 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 00:36:19,970 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 00:36:19,974 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 00:36:19,976 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 00:36:19,977 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 00:36:19,985 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 00:36:20,006 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 00:36:20,052 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 00:36:20,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 00:36:20,057 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 00:36:20,058 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 00:36:20,058 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 00:36:20,059 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 00:36:20,059 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 00:36:20,059 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 00:36:20,059 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 00:36:20,059 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 00:36:20,060 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 00:36:20,060 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 00:36:20,060 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 00:36:20,062 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 00:36:20,062 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 00:36:20,062 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 00:36:20,062 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 00:36:20,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 00:36:20,063 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 00:36:20,063 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 00:36:20,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 00:36:20,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 00:36:20,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 00:36:20,064 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 00:36:20,064 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 00:36:20,064 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 00:36:20,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:20,064 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 00:36:20,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 00:36:20,065 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 00:36:20,420 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 00:36:20,440 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 00:36:20,447 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 00:36:20,449 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 00:36:20,449 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 00:36:20,450 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 00:36:20,550 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3cf2ad6d4/7df3358908814cc99e2f45e8de15d2a5/FLAGb7db81b95 [2020-07-21 00:36:21,138 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 00:36:21,139 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-21 00:36:21,150 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3cf2ad6d4/7df3358908814cc99e2f45e8de15d2a5/FLAGb7db81b95 [2020-07-21 00:36:21,515 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3cf2ad6d4/7df3358908814cc99e2f45e8de15d2a5 [2020-07-21 00:36:21,525 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 00:36:21,529 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 00:36:21,530 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 00:36:21,531 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 00:36:21,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 00:36:21,536 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,539 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a18ba82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21, skipping insertion in model container [2020-07-21 00:36:21,540 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,549 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 00:36:21,569 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 00:36:21,783 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:36:21,788 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 00:36:21,803 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 00:36:21,817 INFO L208 MainTranslator]: Completed translation [2020-07-21 00:36:21,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21 WrapperNode [2020-07-21 00:36:21,818 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 00:36:21,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 00:36:21,818 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 00:36:21,819 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 00:36:21,831 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,837 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,837 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,842 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (1/1) ... [2020-07-21 00:36:21,847 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 00:36:21,848 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 00:36:21,848 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 00:36:21,849 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 00:36:21,850 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (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 00:36:22,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 00:36:22,043 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 00:36:22,044 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 00:36:22,044 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 00:36:22,044 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 00:36:22,044 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 00:36:22,044 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 00:36:22,045 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 00:36:22,045 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 00:36:22,045 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 00:36:22,260 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 00:36:22,260 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 00:36:22,267 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:36:22 BoogieIcfgContainer [2020-07-21 00:36:22,267 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 00:36:22,284 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 00:36:22,284 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 00:36:22,291 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 00:36:22,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:36:21" (1/3) ... [2020-07-21 00:36:22,303 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58acee09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:36:22, skipping insertion in model container [2020-07-21 00:36:22,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:36:21" (2/3) ... [2020-07-21 00:36:22,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58acee09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:36:22, skipping insertion in model container [2020-07-21 00:36:22,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:36:22" (3/3) ... [2020-07-21 00:36:22,312 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-2.c [2020-07-21 00:36:22,336 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 00:36:22,358 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 00:36:22,381 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 00:36:22,418 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 00:36:22,419 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 00:36:22,419 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 00:36:22,419 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 00:36:22,419 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 00:36:22,419 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 00:36:22,420 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 00:36:22,420 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 00:36:22,438 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 00:36:22,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 00:36:22,445 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:22,447 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:36:22,447 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:22,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:22,454 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 00:36:22,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:22,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637678279] [2020-07-21 00:36:22,464 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 00:36:22,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:22,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:22,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:36:22,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:22,650 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 00:36:22,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:36:22,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637678279] [2020-07-21 00:36:22,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:36:22,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:36:22,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483991053] [2020-07-21 00:36:22,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:36:22,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:22,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:36:22,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:36:22,674 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 00:36:22,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:22,789 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 00:36:22,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:36:22,791 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 00:36:22,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:22,803 INFO L225 Difference]: With dead ends: 35 [2020-07-21 00:36:22,803 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 00:36:22,807 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 00:36:22,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 00:36:22,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 00:36:22,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:36:22,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:36:22,860 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 00:36:22,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:22,860 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:36:22,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:36:22,861 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:36:22,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 00:36:22,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:22,864 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:36:23,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:23,079 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:23,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:23,079 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 00:36:23,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:23,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748964854] [2020-07-21 00:36:23,081 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 00:36:23,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 00:36:23,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:23,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 00:36:23,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:23,173 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 00:36:23,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 00:36:23,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748964854] [2020-07-21 00:36:23,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 00:36:23,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 00:36:23,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882537968] [2020-07-21 00:36:23,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 00:36:23,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:23,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 00:36:23,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 00:36:23,179 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 00:36:23,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:23,253 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 00:36:23,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 00:36:23,254 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 00:36:23,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:23,256 INFO L225 Difference]: With dead ends: 27 [2020-07-21 00:36:23,256 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 00:36:23,258 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 00:36:23,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 00:36:23,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 00:36:23,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 00:36:23,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 00:36:23,267 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 00:36:23,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:23,268 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 00:36:23,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 00:36:23,268 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 00:36:23,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 00:36:23,270 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:23,270 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 00:36:23,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:23,485 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:23,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:23,487 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 00:36:23,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:23,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648511721] [2020-07-21 00:36:23,488 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 00:36:23,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:23,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:23,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:36:23,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:23,601 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 00:36:23,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:23,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:23,886 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 00:36:23,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648511721] [2020-07-21 00:36:23,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:23,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:36:23,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163528969] [2020-07-21 00:36:23,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:36:23,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:23,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:36:23,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:36:23,890 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 00:36:24,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:24,036 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 00:36:24,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:36:24,037 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 00:36:24,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:24,039 INFO L225 Difference]: With dead ends: 32 [2020-07-21 00:36:24,039 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 00:36:24,040 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 00:36:24,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 00:36:24,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 00:36:24,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:36:24,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:36:24,051 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 00:36:24,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:24,052 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:36:24,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:36:24,052 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:36:24,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 00:36:24,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:24,054 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 00:36:24,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:24,269 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:24,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:24,270 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 00:36:24,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:24,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230005006] [2020-07-21 00:36:24,271 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 00:36:24,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:24,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:24,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 00:36:24,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:24,350 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 00:36:24,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:24,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:24,575 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 00:36:24,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230005006] [2020-07-21 00:36:24,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:24,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 00:36:24,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731094087] [2020-07-21 00:36:24,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 00:36:24,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:24,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 00:36:24,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 00:36:24,579 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 00:36:24,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:24,662 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 00:36:24,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 00:36:24,663 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 00:36:24,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:24,665 INFO L225 Difference]: With dead ends: 37 [2020-07-21 00:36:24,666 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 00:36:24,667 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 00:36:24,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 00:36:24,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 00:36:24,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 00:36:24,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 00:36:24,677 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 00:36:24,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:24,678 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 00:36:24,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 00:36:24,678 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 00:36:24,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 00:36:24,680 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:24,680 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 00:36:24,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:24,894 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:24,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:24,895 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 00:36:24,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:24,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518818384] [2020-07-21 00:36:24,896 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 00:36:24,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:24,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:24,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:36:24,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:24,998 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 00:36:24,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:25,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:25,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:25,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:25,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:25,377 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 00:36:25,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518818384] [2020-07-21 00:36:25,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:25,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:36:25,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951521424] [2020-07-21 00:36:25,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:36:25,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:25,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:36:25,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:36:25,381 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 00:36:25,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:25,544 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 00:36:25,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:36:25,545 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 00:36:25,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:25,548 INFO L225 Difference]: With dead ends: 42 [2020-07-21 00:36:25,548 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 00:36:25,550 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 00:36:25,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 00:36:25,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 00:36:25,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:36:25,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:36:25,561 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 00:36:25,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:25,562 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:36:25,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:36:25,562 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:36:25,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 00:36:25,564 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:25,564 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 00:36:25,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:25,770 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:25,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:25,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 00:36:25,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:25,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044886143] [2020-07-21 00:36:25,773 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 00:36:25,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:25,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:25,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 00:36:25,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:25,870 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 00:36:25,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:26,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:26,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:26,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:26,198 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 00:36:26,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044886143] [2020-07-21 00:36:26,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:26,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 00:36:26,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736075374] [2020-07-21 00:36:26,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 00:36:26,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:26,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 00:36:26,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 00:36:26,201 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 00:36:26,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:26,345 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 00:36:26,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 00:36:26,346 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 00:36:26,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:26,351 INFO L225 Difference]: With dead ends: 47 [2020-07-21 00:36:26,354 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 00:36:26,356 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 00:36:26,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 00:36:26,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 00:36:26,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 00:36:26,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 00:36:26,379 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 00:36:26,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:26,380 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 00:36:26,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 00:36:26,382 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 00:36:26,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 00:36:26,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:26,388 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 00:36:26,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:26,590 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:26,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:26,590 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 00:36:26,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:26,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124804708] [2020-07-21 00:36:26,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 00:36:26,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 00:36:26,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:26,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:36:26,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:26,692 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 00:36:26,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:27,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:27,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:27,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:27,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:27,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:27,339 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 00:36:27,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124804708] [2020-07-21 00:36:27,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:27,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:36:27,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119145385] [2020-07-21 00:36:27,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:36:27,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:27,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:36:27,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:36:27,342 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 00:36:27,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:27,514 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 00:36:27,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:36:27,515 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 00:36:27,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:27,517 INFO L225 Difference]: With dead ends: 52 [2020-07-21 00:36:27,517 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 00:36:27,518 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 00:36:27,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 00:36:27,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 00:36:27,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:36:27,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:36:27,531 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 00:36:27,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:27,532 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:36:27,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:36:27,532 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:36:27,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 00:36:27,536 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:27,537 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 00:36:27,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:27,750 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:27,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:27,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 00:36:27,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:27,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655690322] [2020-07-21 00:36:27,753 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 00:36:27,801 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:27,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:27,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 00:36:27,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:27,891 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 00:36:27,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:28,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:28,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:28,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:28,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:28,573 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 00:36:28,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655690322] [2020-07-21 00:36:28,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:28,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 00:36:28,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583165760] [2020-07-21 00:36:28,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 00:36:28,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:28,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 00:36:28,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 00:36:28,577 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 00:36:28,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:28,717 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 00:36:28,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 00:36:28,718 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 00:36:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:28,721 INFO L225 Difference]: With dead ends: 57 [2020-07-21 00:36:28,721 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 00:36:28,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:36:28,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 00:36:28,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 00:36:28,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 00:36:28,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 00:36:28,737 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 00:36:28,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:28,737 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 00:36:28,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 00:36:28,738 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 00:36:28,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 00:36:28,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:28,741 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 00:36:28,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:28,956 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:28,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:28,957 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 00:36:28,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:28,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623068246] [2020-07-21 00:36:28,959 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 00:36:29,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:29,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:29,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:36:29,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:29,149 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 00:36:29,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:29,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:29,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:29,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:30,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:30,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:30,174 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 00:36:30,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623068246] [2020-07-21 00:36:30,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:30,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:36:30,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908949724] [2020-07-21 00:36:30,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:36:30,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:30,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:36:30,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:36:30,178 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 00:36:30,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:30,478 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 00:36:30,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:36:30,478 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 00:36:30,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:30,483 INFO L225 Difference]: With dead ends: 62 [2020-07-21 00:36:30,483 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 00:36:30,485 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 00:36:30,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 00:36:30,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 00:36:30,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:36:30,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:36:30,498 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 00:36:30,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:30,498 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:36:30,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:36:30,499 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:36:30,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 00:36:30,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:30,502 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 00:36:30,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:30,717 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:30,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:30,717 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 00:36:30,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:30,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948863634] [2020-07-21 00:36:30,719 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 00:36:30,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:30,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:30,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 00:36:30,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:30,899 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 00:36:30,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:31,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:31,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:31,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:31,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:32,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:32,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:32,097 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 00:36:32,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948863634] [2020-07-21 00:36:32,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:32,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 00:36:32,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511511934] [2020-07-21 00:36:32,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 00:36:32,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:32,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 00:36:32,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 00:36:32,103 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 00:36:32,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:32,292 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 00:36:32,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 00:36:32,293 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 00:36:32,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:32,295 INFO L225 Difference]: With dead ends: 67 [2020-07-21 00:36:32,296 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 00:36:32,297 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 00:36:32,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 00:36:32,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 00:36:32,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 00:36:32,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 00:36:32,314 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 00:36:32,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:32,315 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 00:36:32,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 00:36:32,316 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 00:36:32,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 00:36:32,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:32,320 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 00:36:32,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:32,536 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:32,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:32,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 00:36:32,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:32,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2099455270] [2020-07-21 00:36:32,538 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 00:36:32,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:32,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:32,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:36:32,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:32,751 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 00:36:32,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:34,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:34,759 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 00:36:34,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2099455270] [2020-07-21 00:36:34,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:34,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:36:34,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197952958] [2020-07-21 00:36:34,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:36:34,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:34,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:36:34,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:36:34,763 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 00:36:34,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:34,981 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 00:36:34,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:36:34,982 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 00:36:34,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:34,986 INFO L225 Difference]: With dead ends: 72 [2020-07-21 00:36:34,986 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 00:36:34,987 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 00:36:34,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 00:36:34,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 00:36:34,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:36:35,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:36:35,000 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 00:36:35,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:35,001 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:36:35,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:36:35,002 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:36:35,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 00:36:35,006 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:35,007 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 00:36:35,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:35,222 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:35,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:35,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 00:36:35,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:35,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876219064] [2020-07-21 00:36:35,224 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 00:36:35,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:35,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:35,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 00:36:35,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:35,511 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 00:36:35,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:36,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:37,601 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 00:36:37,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876219064] [2020-07-21 00:36:37,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:37,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 00:36:37,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054384373] [2020-07-21 00:36:37,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 00:36:37,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:37,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 00:36:37,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 00:36:37,609 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 00:36:37,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:37,832 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 00:36:37,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 00:36:37,833 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 00:36:37,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:37,841 INFO L225 Difference]: With dead ends: 77 [2020-07-21 00:36:37,841 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 00:36:37,843 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 00:36:37,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 00:36:37,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 00:36:37,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 00:36:37,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 00:36:37,871 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 00:36:37,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:37,872 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 00:36:37,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 00:36:37,872 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 00:36:37,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 00:36:37,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:37,879 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 00:36:38,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:38,094 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:38,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:38,095 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 00:36:38,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:38,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426533231] [2020-07-21 00:36:38,095 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 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 00:36:38,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:38,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:38,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:36:38,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:38,489 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 00:36:38,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:40,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:41,950 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 00:36:41,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426533231] [2020-07-21 00:36:41,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:41,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:36:41,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642991043] [2020-07-21 00:36:41,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:36:41,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:41,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:36:41,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:36:41,953 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 00:36:42,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:42,446 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 00:36:42,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:36:42,447 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 00:36:42,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:42,455 INFO L225 Difference]: With dead ends: 82 [2020-07-21 00:36:42,455 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 00:36:42,459 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 00:36:42,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 00:36:42,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 00:36:42,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:36:42,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:36:42,481 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 00:36:42,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:42,483 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:36:42,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:36:42,485 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:36:42,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 00:36:42,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:42,490 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 00:36:42,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:42,692 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:42,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:42,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 00:36:42,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:42,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468569826] [2020-07-21 00:36:42,694 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 00:36:42,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:42,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:42,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 00:36:42,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:43,064 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 00:36:43,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:44,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:45,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:46,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:46,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:46,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:46,270 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 00:36:46,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468569826] [2020-07-21 00:36:46,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:46,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 00:36:46,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222149907] [2020-07-21 00:36:46,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 00:36:46,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:46,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 00:36:46,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 00:36:46,273 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 00:36:46,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:46,569 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 00:36:46,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 00:36:46,570 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 00:36:46,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:46,574 INFO L225 Difference]: With dead ends: 87 [2020-07-21 00:36:46,574 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 00:36:46,576 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 00:36:46,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 00:36:46,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 00:36:46,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 00:36:46,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 00:36:46,590 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 00:36:46,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:46,591 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 00:36:46,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 00:36:46,592 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 00:36:46,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 00:36:46,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:46,605 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 00:36:46,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:46,821 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:46,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:46,822 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 00:36:46,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:46,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142202431] [2020-07-21 00:36:46,824 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 00:36:47,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:47,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:47,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:36:47,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:47,824 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 00:36:47,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:51,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:51,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:53,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:53,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:53,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:53,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:53,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:54,887 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 00:36:54,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142202431] [2020-07-21 00:36:54,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:36:54,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:36:54,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932664904] [2020-07-21 00:36:54,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:36:54,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:36:54,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:36:54,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:36:54,892 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 00:36:55,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:36:55,570 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 00:36:55,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:36:55,571 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 00:36:55,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:36:55,576 INFO L225 Difference]: With dead ends: 92 [2020-07-21 00:36:55,576 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 00:36:55,578 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 00:36:55,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 00:36:55,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 00:36:55,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:36:55,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:36:55,593 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 00:36:55,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:36:55,595 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:36:55,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:36:55,595 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:36:55,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-21 00:36:55,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:36:55,603 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 84, 50, 50, 50, 50, 50, 50, 50, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:36:55,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:36:55,817 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:36:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:36:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-21 00:36:55,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:36:55,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510944505] [2020-07-21 00:36:55,818 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 00:36:56,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:36:56,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:36:56,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 00:36:56,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:36:56,394 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3626 refuted. 0 times theorem prover too weak. 24423 trivial. 0 not checked. [2020-07-21 00:36:56,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:36:59,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:36:59,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:00,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:00,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:00,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:00,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:00,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:01,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:01,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:01,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:01,793 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3703 refuted. 0 times theorem prover too weak. 24346 trivial. 0 not checked. [2020-07-21 00:37:01,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510944505] [2020-07-21 00:37:01,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:37:01,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 00:37:01,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020980211] [2020-07-21 00:37:01,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 00:37:01,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:37:01,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 00:37:01,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 00:37:01,811 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 00:37:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:37:02,541 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 00:37:02,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 00:37:02,542 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-21 00:37:02,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:37:02,547 INFO L225 Difference]: With dead ends: 97 [2020-07-21 00:37:02,547 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 00:37:02,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1401 GetRequests, 1358 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 00:37:02,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 00:37:02,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 00:37:02,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 00:37:02,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 00:37:02,564 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-21 00:37:02,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:37:02,565 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 00:37:02,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 00:37:02,566 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 00:37:02,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 00:37:02,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:37:02,611 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:37:02,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:37:02,826 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:37:02,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:37:02,827 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-21 00:37:02,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:37:02,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398607616] [2020-07-21 00:37:02,828 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 00:37:03,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:37:03,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:37:03,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:37:03,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:37:05,030 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11715 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 00:37:05,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:37:10,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:14,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:15,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:16,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:16,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:16,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:16,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:17,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:17,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:17,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:17,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:17,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:18,946 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11807 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 00:37:18,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398607616] [2020-07-21 00:37:18,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:37:18,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:37:18,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386592689] [2020-07-21 00:37:18,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:37:18,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:37:18,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:37:18,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:37:18,953 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 00:37:19,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:37:19,422 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 00:37:19,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:37:19,424 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 00:37:19,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:37:19,432 INFO L225 Difference]: With dead ends: 102 [2020-07-21 00:37:19,433 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 00:37:19,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:37:19,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 00:37:19,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 00:37:19,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:37:19,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:37:19,454 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 00:37:19,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:37:19,456 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:37:19,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:37:19,457 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:37:19,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-21 00:37:19,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:37:19,481 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 164, 98, 98, 98, 98, 98, 98, 98, 66, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:37:19,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:37:19,694 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:37:19,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:37:19,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-21 00:37:19,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:37:19,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423621444] [2020-07-21 00:37:19,696 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:37:20,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:37:20,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:37:20,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 749 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 00:37:20,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:37:20,954 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8306 refuted. 0 times theorem prover too weak. 100095 trivial. 0 not checked. [2020-07-21 00:37:20,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:37:25,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:27,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:27,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:29,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:29,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:29,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:30,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:30,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:30,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:30,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:30,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:31,174 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8406 refuted. 0 times theorem prover too weak. 99995 trivial. 0 not checked. [2020-07-21 00:37:31,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423621444] [2020-07-21 00:37:31,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:37:31,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 00:37:31,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605420095] [2020-07-21 00:37:31,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 00:37:31,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:37:31,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 00:37:31,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 00:37:31,177 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 00:37:31,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:37:31,747 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 00:37:31,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 00:37:31,748 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-21 00:37:31,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:37:31,754 INFO L225 Difference]: With dead ends: 107 [2020-07-21 00:37:31,754 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 00:37:31,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 00:37:31,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 00:37:31,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 00:37:31,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 00:37:31,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 00:37:31,771 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-21 00:37:31,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:37:31,772 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 00:37:31,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 00:37:31,772 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 00:37:31,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-21 00:37:31,826 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:37:31,827 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:37:32,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:37:32,028 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:37:32,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:37:32,030 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-21 00:37:32,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:37:32,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577972715] [2020-07-21 00:37:32,031 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 00:37:32,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:37:32,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:37:32,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 1520 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:37:32,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:37:35,738 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-21 00:37:35,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:37:44,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:49,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:52,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:53,304 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 00:37:53,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:53,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:54,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:55,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:37:57,956 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-21 00:37:57,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577972715] [2020-07-21 00:37:57,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:37:57,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:37:57,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892741049] [2020-07-21 00:37:57,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:37:57,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:37:57,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:37:57,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:37:57,962 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 00:37:59,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:37:59,006 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 00:37:59,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:37:59,008 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-21 00:37:59,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:37:59,016 INFO L225 Difference]: With dead ends: 112 [2020-07-21 00:37:59,016 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 00:37:59,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 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 00:37:59,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 00:37:59,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 00:37:59,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:37:59,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:37:59,036 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-21 00:37:59,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:37:59,039 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:37:59,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:37:59,039 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:37:59,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2865 [2020-07-21 00:37:59,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:37:59,114 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 343, 209, 209, 209, 209, 209, 209, 209, 134, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:37:59,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:37:59,330 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:37:59,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:37:59,332 INFO L82 PathProgramCache]: Analyzing trace with hash 565204626, now seen corresponding path program 9 times [2020-07-21 00:37:59,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:37:59,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323664457] [2020-07-21 00:37:59,333 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 00:37:59,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:37:59,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:37:59,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 1586 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 00:38:00,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:38:03,350 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20214 refuted. 0 times theorem prover too weak. 472883 trivial. 0 not checked. [2020-07-21 00:38:03,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:38:12,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:18,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:21,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:21,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:22,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:23,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:27,289 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20340 refuted. 0 times theorem prover too weak. 472757 trivial. 0 not checked. [2020-07-21 00:38:27,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323664457] [2020-07-21 00:38:27,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:38:27,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 00:38:27,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489377868] [2020-07-21 00:38:27,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 00:38:27,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:38:27,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 00:38:27,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 00:38:27,295 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 00:38:28,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:38:28,321 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 00:38:28,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 00:38:28,322 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2864 [2020-07-21 00:38:28,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:38:28,329 INFO L225 Difference]: With dead ends: 117 [2020-07-21 00:38:28,329 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 00:38:28,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5737 GetRequests, 5684 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 00:38:28,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 00:38:28,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 00:38:28,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 00:38:28,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 00:38:28,352 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2864 [2020-07-21 00:38:28,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:38:28,355 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 00:38:28,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 00:38:28,355 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 00:38:28,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 00:38:28,518 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:38:28,520 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 00:38:28,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:38:28,735 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:38:28,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:38:28,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 00:38:28,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:38:28,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874222006] [2020-07-21 00:38:28,738 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 00:38:29,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:38:29,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:38:29,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 2216 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:38:29,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:38:36,755 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 00:38:36,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:38:52,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:38:52,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:00,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:03,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:05,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:06,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:07,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:07,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:07,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:08,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:08,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:08,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:14,248 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 00:39:14,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874222006] [2020-07-21 00:39:14,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:39:14,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:39:14,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129760816] [2020-07-21 00:39:14,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:39:14,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:39:14,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:39:14,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:39:14,254 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 00:39:15,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:39:15,419 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 00:39:15,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:39:15,420 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 00:39:15,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:39:15,428 INFO L225 Difference]: With dead ends: 122 [2020-07-21 00:39:15,428 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 00:39:15,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 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 00:39:15,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 00:39:15,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 00:39:15,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:39:15,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:39:15,454 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 00:39:15,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:39:15,458 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:39:15,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:39:15,458 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:39:15,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5131 [2020-07-21 00:39:15,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:39:15,657 INFO L422 BasicCegarLoop]: trace histogram [755, 755, 593, 377, 377, 377, 377, 377, 377, 377, 216, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:39:15,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:39:15,858 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:39:15,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:39:15,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1930612962, now seen corresponding path program 10 times [2020-07-21 00:39:15,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:39:15,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625084124] [2020-07-21 00:39:15,861 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 00:39:16,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:39:16,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:39:16,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 2846 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 00:39:17,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:39:26,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40602 refuted. 0 times theorem prover too weak. 1551693 trivial. 0 not checked. [2020-07-21 00:39:26,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:39:44,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:55,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:39:55,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:01,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:01,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:03,999 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:40:05,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:05,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:06,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:06,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:06,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:07,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:07,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:07,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:07,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:07,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:40:17,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40757 refuted. 0 times theorem prover too weak. 1551538 trivial. 0 not checked. [2020-07-21 00:40:17,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625084124] [2020-07-21 00:40:17,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:40:17,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 00:40:17,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249454952] [2020-07-21 00:40:17,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 00:40:17,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:40:17,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 00:40:17,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 00:40:17,539 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 00:40:19,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:40:19,129 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 00:40:19,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 00:40:19,131 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5130 [2020-07-21 00:40:19,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:40:19,143 INFO L225 Difference]: With dead ends: 127 [2020-07-21 00:40:19,143 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 00:40:19,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10270 GetRequests, 10212 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 00:40:19,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 00:40:19,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 00:40:19,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 00:40:19,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 00:40:19,180 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5130 [2020-07-21 00:40:19,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:40:19,184 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 00:40:19,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 00:40:19,184 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 00:40:19,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5461 [2020-07-21 00:40:19,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:40:19,381 INFO L422 BasicCegarLoop]: trace histogram [839, 839, 420, 419, 419, 419, 419, 419, 419, 419, 419, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:40:19,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:40:19,583 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:40:19,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:40:19,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1050665484, now seen corresponding path program 11 times [2020-07-21 00:40:19,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:40:19,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023322155] [2020-07-21 00:40:19,586 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 00:40:20,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:40:20,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:40:20,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 3040 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:40:20,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:40:31,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1844019 backedges. 6015 proven. 46494 refuted. 0 times theorem prover too weak. 1791510 trivial. 0 not checked. [2020-07-21 00:40:31,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:40:56,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:05,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:12,968 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 00:41:13,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:13,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:17,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:19,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:20,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:20,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:21,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:21,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:22,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:22,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:22,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:22,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:22,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:41:34,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1844019 backedges. 6015 proven. 46670 refuted. 0 times theorem prover too weak. 1791334 trivial. 0 not checked. [2020-07-21 00:41:34,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023322155] [2020-07-21 00:41:34,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:41:34,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:41:34,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607166877] [2020-07-21 00:41:34,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:41:34,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:41:34,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:41:34,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:41:34,557 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 00:41:36,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:41:36,021 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 00:41:36,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:41:36,022 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5460 [2020-07-21 00:41:36,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:41:36,033 INFO L225 Difference]: With dead ends: 132 [2020-07-21 00:41:36,034 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 00:41:36,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10932 GetRequests, 10869 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 00:41:36,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 00:41:36,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 00:41:36,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:41:36,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:41:36,064 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5460 [2020-07-21 00:41:36,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:41:36,069 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:41:36,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:41:36,069 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:41:38,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12541 [2020-07-21 00:41:38,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:41:38,133 INFO L422 BasicCegarLoop]: trace histogram [1827, 1827, 1571, 913, 913, 913, 913, 913, 913, 913, 658, 256, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:41:38,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:41:38,347 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:41:38,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:41:38,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1359252116, now seen corresponding path program 11 times [2020-07-21 00:41:38,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:41:38,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745009199] [2020-07-21 00:41:38,354 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 00:41:40,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:41:40,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:41:40,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 6953 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 00:41:40,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:42:38,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9570751 backedges. 12048 proven. 111985 refuted. 0 times theorem prover too weak. 9446718 trivial. 0 not checked. [2020-07-21 00:42:38,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:43:48,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:43:48,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:07,086 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:44:11,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:23,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:23,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:33,940 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 00:44:34,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:34,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:37,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:37,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:41,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:41,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:42,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:43,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:43,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:43,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:43,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:43,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:44:44,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 00:45:38,781 INFO L134 CoverageAnalysis]: Checked inductivity of 9570751 backedges. 12048 proven. 112172 refuted. 0 times theorem prover too weak. 9446531 trivial. 0 not checked. [2020-07-21 00:45:38,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745009199] [2020-07-21 00:45:38,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 00:45:38,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 00:45:38,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36855970] [2020-07-21 00:45:38,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 00:45:38,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 00:45:38,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 00:45:38,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 00:45:38,794 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 00:45:39,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 00:45:39,677 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 00:45:39,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 00:45:39,679 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 12540 [2020-07-21 00:45:39,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 00:45:39,692 INFO L225 Difference]: With dead ends: 137 [2020-07-21 00:45:39,692 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 00:45:39,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25091 GetRequests, 25028 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 00:45:39,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 00:45:39,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 00:45:39,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 00:45:39,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 00:45:39,719 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 12540 [2020-07-21 00:45:39,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 00:45:39,725 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 00:45:39,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 00:45:39,725 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 00:45:41,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17551 [2020-07-21 00:45:41,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 00:45:41,394 INFO L422 BasicCegarLoop]: trace histogram [2699, 2699, 1350, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 00:45:41,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 00:45:41,595 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 00:45:41,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 00:45:41,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1047465342, now seen corresponding path program 12 times [2020-07-21 00:45:41,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 00:45:41,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704031242] [2020-07-21 00:45:41,609 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 00:45:44,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 00:45:44,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 00:45:44,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 9786 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 00:45:44,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 00:47:14,424 INFO L134 CoverageAnalysis]: Checked inductivity of 19109934 backedges. 17943 proven. 167385 refuted. 0 times theorem prover too weak. 18924606 trivial. 0 not checked. [2020-07-21 00:47:14,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 00:47:34,330 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 00:47:34,447 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 00:47:34,557 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 00:47:34,668 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 00:47:34,775 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 00:47:34,878 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 00:47:52,951 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 00:49:30,604 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 00:49:30,809 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:49:30,911 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 00:49:33,758 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:49:33,866 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 00:49:33,983 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:49:34,105 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 00:49:39,283 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 00:49:40,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts