/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:22:59,399 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:22:59,402 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:22:59,416 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 21:22:59,436 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:22:59,439 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:22:59,440 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:22:59,441 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:22:59,443 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:22:59,446 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:22:59,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:22:59,451 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:22:59,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:22:59,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:22:59,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:22:59,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:22:59,457 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 21:22:59,471 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:22:59,474 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:22:59,475 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:22:59,475 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 [2019-11-06 21:22:59,498 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:22:59,498 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:22:59,500 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:22:59,500 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:22:59,501 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:22:59,501 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:22:59,501 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:22:59,501 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:22:59,501 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:22:59,502 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:22:59,503 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:22:59,503 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:22:59,503 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:22:59,504 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:22:59,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:22:59,504 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:22:59,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:22:59,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:22:59,505 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:22:59,505 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:22:59,505 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:22:59,505 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:22:59,506 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:22:59,506 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:22:59,506 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:22:59,506 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:22:59,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:22:59,507 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:22:59,507 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:22:59,830 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:22:59,843 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:22:59,847 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:22:59,848 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:22:59,849 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:22:59,849 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2019-11-06 21:22:59,910 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad10ae991/2a1e229efafb4304830e3bfa692bf310/FLAG97501dd10 [2019-11-06 21:23:00,351 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:23:00,351 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2019-11-06 21:23:00,357 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad10ae991/2a1e229efafb4304830e3bfa692bf310/FLAG97501dd10 [2019-11-06 21:23:00,750 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad10ae991/2a1e229efafb4304830e3bfa692bf310 [2019-11-06 21:23:00,761 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:23:00,762 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:23:00,763 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:23:00,764 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:23:00,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:23:00,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:23:00" (1/1) ... [2019-11-06 21:23:00,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@217fd784 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:00, skipping insertion in model container [2019-11-06 21:23:00,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:23:00" (1/1) ... [2019-11-06 21:23:00,782 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:23:00,799 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:23:00,982 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:23:00,986 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:23:00,999 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:23:01,010 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:23:01,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01 WrapperNode [2019-11-06 21:23:01,011 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:23:01,012 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:23:01,012 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:23:01,012 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:23:01,103 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,103 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,108 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,108 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,112 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,119 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,120 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (1/1) ... [2019-11-06 21:23:01,121 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:23:01,121 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:23:01,121 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:23:01,121 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:23:01,122 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (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 [2019-11-06 21:23:01,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:23:01,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:23:01,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:23:01,177 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:23:01,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:23:01,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:23:01,345 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:23:01,346 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:23:01,347 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:23:01 BoogieIcfgContainer [2019-11-06 21:23:01,347 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:23:01,348 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:23:01,349 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:23:01,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:23:01,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:23:00" (1/3) ... [2019-11-06 21:23:01,353 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@217b9238 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:23:01, skipping insertion in model container [2019-11-06 21:23:01,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:23:01" (2/3) ... [2019-11-06 21:23:01,354 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@217b9238 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:23:01, skipping insertion in model container [2019-11-06 21:23:01,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:23:01" (3/3) ... [2019-11-06 21:23:01,356 INFO L109 eAbstractionObserver]: Analyzing ICFG gr2006.i [2019-11-06 21:23:01,366 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:23:01,374 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:23:01,386 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:23:01,428 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:23:01,428 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:23:01,429 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:23:01,429 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:23:01,429 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:23:01,430 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:23:01,430 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:23:01,430 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:23:01,453 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-06 21:23:01,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:23:01,461 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:01,462 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:01,465 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:01,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:01,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1001202113, now seen corresponding path program 1 times [2019-11-06 21:23:01,480 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:01,481 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623356480] [2019-11-06 21:23:01,481 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:01,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:01,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623356480] [2019-11-06 21:23:01,582 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:23:01,582 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-06 21:23:01,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290113933] [2019-11-06 21:23:01,587 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-06 21:23:01,587 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:01,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-06 21:23:01,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:23:01,599 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-11-06 21:23:01,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:01,621 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-11-06 21:23:01,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-06 21:23:01,622 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-06 21:23:01,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:01,631 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:23:01,631 INFO L226 Difference]: Without dead ends: 13 [2019-11-06 21:23:01,635 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:23:01,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-11-06 21:23:01,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-11-06 21:23:01,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-06 21:23:01,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-11-06 21:23:01,675 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-11-06 21:23:01,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:01,676 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-11-06 21:23:01,676 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-06 21:23:01,676 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-11-06 21:23:01,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:23:01,677 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:01,677 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:01,677 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:01,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:01,678 INFO L82 PathProgramCache]: Analyzing trace with hash 563077882, now seen corresponding path program 1 times [2019-11-06 21:23:01,678 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:01,679 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851879005] [2019-11-06 21:23:01,679 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:01,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:01,792 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851879005] [2019-11-06 21:23:01,793 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:23:01,793 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 21:23:01,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707282844] [2019-11-06 21:23:01,801 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:23:01,801 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:01,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:23:01,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:23:01,802 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2019-11-06 21:23:01,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:01,884 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-11-06 21:23:01,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:23:01,885 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-06 21:23:01,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:01,887 INFO L225 Difference]: With dead ends: 22 [2019-11-06 21:23:01,887 INFO L226 Difference]: Without dead ends: 17 [2019-11-06 21:23:01,889 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:23:01,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-06 21:23:01,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-06 21:23:01,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-06 21:23:01,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-11-06 21:23:01,899 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-11-06 21:23:01,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:01,900 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-11-06 21:23:01,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:23:01,900 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-11-06 21:23:01,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-06 21:23:01,902 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:01,902 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:01,903 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:01,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:01,903 INFO L82 PathProgramCache]: Analyzing trace with hash 620336184, now seen corresponding path program 1 times [2019-11-06 21:23:01,904 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:01,904 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040685970] [2019-11-06 21:23:01,905 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:01,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:01,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:01,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040685970] [2019-11-06 21:23:01,954 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:23:01,955 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 21:23:01,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371954075] [2019-11-06 21:23:01,957 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 21:23:01,957 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:01,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 21:23:01,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:23:01,958 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-11-06 21:23:01,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:01,985 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-11-06 21:23:01,987 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 21:23:01,988 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-06 21:23:01,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:01,989 INFO L225 Difference]: With dead ends: 32 [2019-11-06 21:23:01,989 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 21:23:01,991 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 21:23:01,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 21:23:01,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-06 21:23:01,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-06 21:23:02,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-06 21:23:02,004 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2019-11-06 21:23:02,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:02,005 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-06 21:23:02,005 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 21:23:02,005 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-06 21:23:02,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 21:23:02,008 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:02,008 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:02,008 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:02,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:02,009 INFO L82 PathProgramCache]: Analyzing trace with hash -657196198, now seen corresponding path program 1 times [2019-11-06 21:23:02,009 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:02,010 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693706017] [2019-11-06 21:23:02,010 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:02,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,082 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:02,083 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693706017] [2019-11-06 21:23:02,083 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510197256] [2019-11-06 21:23:02,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:02,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,123 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 21:23:02,129 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:02,149 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:02,150 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:02,150 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2019-11-06 21:23:02,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556519927] [2019-11-06 21:23:02,151 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 21:23:02,151 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:02,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 21:23:02,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:23:02,152 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-11-06 21:23:02,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:02,180 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-11-06 21:23:02,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 21:23:02,181 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-06 21:23:02,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:02,182 INFO L225 Difference]: With dead ends: 35 [2019-11-06 21:23:02,182 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 21:23:02,183 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 21:23:02,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 21:23:02,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-11-06 21:23:02,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 21:23:02,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-11-06 21:23:02,189 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 18 [2019-11-06 21:23:02,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:02,189 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-11-06 21:23:02,189 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 21:23:02,190 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-11-06 21:23:02,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-06 21:23:02,190 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:02,191 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:02,395 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:02,396 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:02,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:02,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1550672957, now seen corresponding path program 2 times [2019-11-06 21:23:02,398 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:02,398 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [125500606] [2019-11-06 21:23:02,398 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:02,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:02,502 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 21:23:02,503 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [125500606] [2019-11-06 21:23:02,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344385271] [2019-11-06 21:23:02,504 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:02,544 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:02,545 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:02,546 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 21:23:02,547 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:02,589 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:02,589 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:02,590 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2019-11-06 21:23:02,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397227628] [2019-11-06 21:23:02,591 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:23:02,591 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:02,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:23:02,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:23:02,592 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2019-11-06 21:23:02,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:02,792 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-11-06 21:23:02,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:23:02,793 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2019-11-06 21:23:02,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:02,794 INFO L225 Difference]: With dead ends: 54 [2019-11-06 21:23:02,794 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 21:23:02,795 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:23:02,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 21:23:02,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2019-11-06 21:23:02,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 21:23:02,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-11-06 21:23:02,803 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 21 [2019-11-06 21:23:02,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:02,805 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-11-06 21:23:02,805 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:23:02,805 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-11-06 21:23:02,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 21:23:02,806 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:02,806 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:03,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:03,012 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:03,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:03,013 INFO L82 PathProgramCache]: Analyzing trace with hash -497587749, now seen corresponding path program 3 times [2019-11-06 21:23:03,013 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:03,013 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119764949] [2019-11-06 21:23:03,013 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:03,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,133 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 21:23:03,133 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119764949] [2019-11-06 21:23:03,134 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835136057] [2019-11-06 21:23:03,135 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:03,169 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 21:23:03,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:03,171 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:23:03,173 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:03,232 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 21:23:03,233 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:03,233 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2019-11-06 21:23:03,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343424947] [2019-11-06 21:23:03,234 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 21:23:03,234 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:03,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 21:23:03,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:23:03,235 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 11 states. [2019-11-06 21:23:03,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:03,428 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2019-11-06 21:23:03,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 21:23:03,429 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-11-06 21:23:03,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:03,431 INFO L225 Difference]: With dead ends: 81 [2019-11-06 21:23:03,432 INFO L226 Difference]: Without dead ends: 76 [2019-11-06 21:23:03,432 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=135, Invalid=245, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:23:03,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-06 21:23:03,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 43. [2019-11-06 21:23:03,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 21:23:03,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-11-06 21:23:03,442 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-11-06 21:23:03,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:03,442 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-11-06 21:23:03,442 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 21:23:03,442 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-11-06 21:23:03,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 21:23:03,444 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:03,444 INFO L410 BasicCegarLoop]: trace histogram [11, 10, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:03,647 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:03,647 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:03,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:03,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1927396762, now seen corresponding path program 4 times [2019-11-06 21:23:03,648 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:03,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981045828] [2019-11-06 21:23:03,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:03,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:03,881 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 81 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:03,882 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981045828] [2019-11-06 21:23:03,882 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559943217] [2019-11-06 21:23:03,882 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:03,936 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:03,937 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:03,937 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 21:23:03,940 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:04,004 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 80 proven. 15 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:04,004 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:04,004 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 6] total 20 [2019-11-06 21:23:04,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746907470] [2019-11-06 21:23:04,008 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:23:04,008 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:04,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:23:04,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:23:04,009 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2019-11-06 21:23:04,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:04,157 INFO L93 Difference]: Finished difference Result 77 states and 94 transitions. [2019-11-06 21:23:04,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:23:04,157 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-06 21:23:04,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:04,158 INFO L225 Difference]: With dead ends: 77 [2019-11-06 21:23:04,158 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 21:23:04,159 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:23:04,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 21:23:04,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-11-06 21:23:04,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 21:23:04,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2019-11-06 21:23:04,167 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 42 [2019-11-06 21:23:04,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:04,168 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2019-11-06 21:23:04,168 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:23:04,168 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2019-11-06 21:23:04,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 21:23:04,169 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:04,170 INFO L410 BasicCegarLoop]: trace histogram [12, 11, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:04,377 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:04,377 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:04,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:04,378 INFO L82 PathProgramCache]: Analyzing trace with hash -778605187, now seen corresponding path program 5 times [2019-11-06 21:23:04,378 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:04,378 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515018181] [2019-11-06 21:23:04,378 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:04,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:04,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:04,602 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:04,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515018181] [2019-11-06 21:23:04,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380495292] [2019-11-06 21:23:04,603 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:04,651 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:23:04,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:04,653 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 21:23:04,655 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:04,737 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 102 proven. 26 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:04,738 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:04,738 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7] total 23 [2019-11-06 21:23:04,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402272769] [2019-11-06 21:23:04,739 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:23:04,739 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:04,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:23:04,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:23:04,740 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2019-11-06 21:23:04,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:04,911 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2019-11-06 21:23:04,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:23:04,911 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2019-11-06 21:23:04,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:04,912 INFO L225 Difference]: With dead ends: 80 [2019-11-06 21:23:04,913 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 21:23:04,914 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=238, Invalid=754, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:23:04,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 21:23:04,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-11-06 21:23:04,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 21:23:04,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2019-11-06 21:23:04,921 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 45 [2019-11-06 21:23:04,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:04,921 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2019-11-06 21:23:04,921 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:23:04,921 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2019-11-06 21:23:04,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 21:23:04,923 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:04,923 INFO L410 BasicCegarLoop]: trace histogram [13, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:05,134 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:05,135 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:05,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:05,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1253478074, now seen corresponding path program 6 times [2019-11-06 21:23:05,135 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:05,135 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087269292] [2019-11-06 21:23:05,135 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:05,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:05,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:05,377 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 87 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:05,377 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087269292] [2019-11-06 21:23:05,377 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814869299] [2019-11-06 21:23:05,377 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:05,433 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:23:05,433 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:05,434 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 21:23:05,436 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:05,546 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 124 proven. 40 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:05,547 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:05,547 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8] total 26 [2019-11-06 21:23:05,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086541912] [2019-11-06 21:23:05,548 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 21:23:05,548 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:05,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 21:23:05,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=510, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:23:05,549 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 26 states. [2019-11-06 21:23:05,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:05,856 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2019-11-06 21:23:05,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:23:05,857 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 48 [2019-11-06 21:23:05,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:05,858 INFO L225 Difference]: With dead ends: 83 [2019-11-06 21:23:05,858 INFO L226 Difference]: Without dead ends: 53 [2019-11-06 21:23:05,859 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=324, Invalid=1008, Unknown=0, NotChecked=0, Total=1332 [2019-11-06 21:23:05,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-06 21:23:05,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-11-06 21:23:05,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 21:23:05,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-11-06 21:23:05,866 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 48 [2019-11-06 21:23:05,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:05,866 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-11-06 21:23:05,866 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 21:23:05,866 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-11-06 21:23:05,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 21:23:05,867 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:05,867 INFO L410 BasicCegarLoop]: trace histogram [14, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:06,070 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:06,071 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:06,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:06,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1481869405, now seen corresponding path program 7 times [2019-11-06 21:23:06,072 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:06,072 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127273733] [2019-11-06 21:23:06,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:06,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:06,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 90 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:06,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127273733] [2019-11-06 21:23:06,304 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850449560] [2019-11-06 21:23:06,305 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:06,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:06,369 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 21:23:06,381 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:06,536 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 146 proven. 57 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:06,536 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:06,536 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 29 [2019-11-06 21:23:06,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394144237] [2019-11-06 21:23:06,537 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:23:06,537 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:06,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:23:06,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:23:06,538 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand 29 states. [2019-11-06 21:23:06,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:06,787 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2019-11-06 21:23:06,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:23:06,788 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 51 [2019-11-06 21:23:06,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:06,788 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:23:06,789 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 21:23:06,791 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=425, Invalid=1297, Unknown=0, NotChecked=0, Total=1722 [2019-11-06 21:23:06,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 21:23:06,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-11-06 21:23:06,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 21:23:06,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2019-11-06 21:23:06,796 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 51 [2019-11-06 21:23:06,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:06,797 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2019-11-06 21:23:06,797 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:23:06,797 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2019-11-06 21:23:06,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 21:23:06,798 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:06,798 INFO L410 BasicCegarLoop]: trace histogram [15, 14, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:07,010 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:07,010 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:07,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:07,011 INFO L82 PathProgramCache]: Analyzing trace with hash -2035152934, now seen corresponding path program 8 times [2019-11-06 21:23:07,011 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:07,011 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439091126] [2019-11-06 21:23:07,011 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:07,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,095 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:07,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439091126] [2019-11-06 21:23:07,095 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713462524] [2019-11-06 21:23:07,095 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:07,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:07,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:07,139 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 21:23:07,141 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:07,150 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:07,151 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:07,151 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2019-11-06 21:23:07,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239066429] [2019-11-06 21:23:07,152 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:23:07,152 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:07,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:23:07,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:23:07,152 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 10 states. [2019-11-06 21:23:07,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:07,197 INFO L93 Difference]: Finished difference Result 89 states and 106 transitions. [2019-11-06 21:23:07,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:23:07,200 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2019-11-06 21:23:07,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:07,201 INFO L225 Difference]: With dead ends: 89 [2019-11-06 21:23:07,201 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 21:23:07,202 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:23:07,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 21:23:07,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-11-06 21:23:07,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 21:23:07,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2019-11-06 21:23:07,209 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 54 [2019-11-06 21:23:07,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:07,209 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2019-11-06 21:23:07,209 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:23:07,209 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2019-11-06 21:23:07,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-06 21:23:07,210 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:07,210 INFO L410 BasicCegarLoop]: trace histogram [16, 15, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:07,413 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:07,414 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:07,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:07,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1920468163, now seen corresponding path program 9 times [2019-11-06 21:23:07,415 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:07,416 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427838643] [2019-11-06 21:23:07,416 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:07,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:07,560 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-11-06 21:23:07,560 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427838643] [2019-11-06 21:23:07,561 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059468409] [2019-11-06 21:23:07,561 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:07,606 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:23:07,607 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:07,607 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:23:07,609 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:07,737 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 190 proven. 100 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-06 21:23:07,738 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:07,738 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2019-11-06 21:23:07,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924880429] [2019-11-06 21:23:07,739 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:23:07,739 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:07,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:23:07,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:23:07,740 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 21 states. [2019-11-06 21:23:08,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:08,168 INFO L93 Difference]: Finished difference Result 174 states and 221 transitions. [2019-11-06 21:23:08,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 21:23:08,169 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 57 [2019-11-06 21:23:08,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:08,171 INFO L225 Difference]: With dead ends: 174 [2019-11-06 21:23:08,171 INFO L226 Difference]: Without dead ends: 144 [2019-11-06 21:23:08,172 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=398, Invalid=1242, Unknown=0, NotChecked=0, Total=1640 [2019-11-06 21:23:08,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-11-06 21:23:08,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 76. [2019-11-06 21:23:08,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-06 21:23:08,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2019-11-06 21:23:08,182 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 57 [2019-11-06 21:23:08,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:08,182 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2019-11-06 21:23:08,182 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:23:08,182 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2019-11-06 21:23:08,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 21:23:08,183 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:08,184 INFO L410 BasicCegarLoop]: trace histogram [18, 17, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:08,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:08,388 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:08,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:08,388 INFO L82 PathProgramCache]: Analyzing trace with hash -588505765, now seen corresponding path program 10 times [2019-11-06 21:23:08,388 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:08,388 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075947733] [2019-11-06 21:23:08,388 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:08,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:08,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:08,504 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 333 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-11-06 21:23:08,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075947733] [2019-11-06 21:23:08,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188262647] [2019-11-06 21:23:08,505 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:08,550 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:08,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:08,551 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 21:23:08,554 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:08,675 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 241 proven. 126 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-11-06 21:23:08,675 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:08,675 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2019-11-06 21:23:08,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384982494] [2019-11-06 21:23:08,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:23:08,676 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:08,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:23:08,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:23:08,677 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand 23 states. [2019-11-06 21:23:09,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:09,168 INFO L93 Difference]: Finished difference Result 220 states and 282 transitions. [2019-11-06 21:23:09,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-06 21:23:09,169 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2019-11-06 21:23:09,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:09,170 INFO L225 Difference]: With dead ends: 220 [2019-11-06 21:23:09,170 INFO L226 Difference]: Without dead ends: 175 [2019-11-06 21:23:09,173 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=476, Invalid=1504, Unknown=0, NotChecked=0, Total=1980 [2019-11-06 21:23:09,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2019-11-06 21:23:09,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 82. [2019-11-06 21:23:09,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-11-06 21:23:09,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2019-11-06 21:23:09,202 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 63 [2019-11-06 21:23:09,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:09,202 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2019-11-06 21:23:09,202 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:23:09,202 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2019-11-06 21:23:09,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-06 21:23:09,209 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:09,209 INFO L410 BasicCegarLoop]: trace histogram [20, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:09,413 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:09,414 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:09,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:09,414 INFO L82 PathProgramCache]: Analyzing trace with hash -346376131, now seen corresponding path program 11 times [2019-11-06 21:23:09,414 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:09,414 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666794731] [2019-11-06 21:23:09,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:09,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:09,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:09,549 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 415 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-11-06 21:23:09,549 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666794731] [2019-11-06 21:23:09,549 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210992653] [2019-11-06 21:23:09,549 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:09,603 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2019-11-06 21:23:09,603 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:09,604 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 21:23:09,606 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:09,762 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 298 proven. 155 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-11-06 21:23:09,763 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:09,763 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2019-11-06 21:23:09,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283127572] [2019-11-06 21:23:09,764 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:23:09,764 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:09,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:23:09,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:23:09,765 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand 25 states. [2019-11-06 21:23:10,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:10,245 INFO L93 Difference]: Finished difference Result 242 states and 311 transitions. [2019-11-06 21:23:10,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 21:23:10,246 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2019-11-06 21:23:10,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:10,247 INFO L225 Difference]: With dead ends: 242 [2019-11-06 21:23:10,247 INFO L226 Difference]: Without dead ends: 194 [2019-11-06 21:23:10,249 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=1791, Unknown=0, NotChecked=0, Total=2352 [2019-11-06 21:23:10,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-11-06 21:23:10,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 88. [2019-11-06 21:23:10,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-06 21:23:10,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 103 transitions. [2019-11-06 21:23:10,259 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 103 transitions. Word has length 69 [2019-11-06 21:23:10,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:10,259 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 103 transitions. [2019-11-06 21:23:10,259 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:23:10,259 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 103 transitions. [2019-11-06 21:23:10,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-06 21:23:10,261 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:10,261 INFO L410 BasicCegarLoop]: trace histogram [22, 21, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:10,472 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:10,473 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:10,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:10,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2024448987, now seen corresponding path program 12 times [2019-11-06 21:23:10,474 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:10,474 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724310643] [2019-11-06 21:23:10,474 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:10,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:10,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-11-06 21:23:10,642 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724310643] [2019-11-06 21:23:10,642 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503545363] [2019-11-06 21:23:10,643 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:10,710 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2019-11-06 21:23:10,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:10,711 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 21:23:10,713 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:10,929 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 361 proven. 187 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2019-11-06 21:23:10,930 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:10,930 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2019-11-06 21:23:10,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409333032] [2019-11-06 21:23:10,931 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:23:10,931 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:10,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:23:10,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:23:10,932 INFO L87 Difference]: Start difference. First operand 88 states and 103 transitions. Second operand 27 states. [2019-11-06 21:23:11,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:11,510 INFO L93 Difference]: Finished difference Result 264 states and 340 transitions. [2019-11-06 21:23:11,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-11-06 21:23:11,511 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 75 [2019-11-06 21:23:11,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:11,512 INFO L225 Difference]: With dead ends: 264 [2019-11-06 21:23:11,512 INFO L226 Difference]: Without dead ends: 213 [2019-11-06 21:23:11,514 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=653, Invalid=2103, Unknown=0, NotChecked=0, Total=2756 [2019-11-06 21:23:11,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2019-11-06 21:23:11,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 94. [2019-11-06 21:23:11,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-11-06 21:23:11,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 110 transitions. [2019-11-06 21:23:11,525 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 110 transitions. Word has length 75 [2019-11-06 21:23:11,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:11,526 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 110 transitions. [2019-11-06 21:23:11,526 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:23:11,526 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 110 transitions. [2019-11-06 21:23:11,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-11-06 21:23:11,527 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:11,527 INFO L410 BasicCegarLoop]: trace histogram [24, 23, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:11,732 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:11,733 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:11,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:11,733 INFO L82 PathProgramCache]: Analyzing trace with hash 275670333, now seen corresponding path program 13 times [2019-11-06 21:23:11,733 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:11,734 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507090691] [2019-11-06 21:23:11,734 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:11,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:11,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:11,898 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 606 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-11-06 21:23:11,898 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507090691] [2019-11-06 21:23:11,898 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019373516] [2019-11-06 21:23:11,899 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:11,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:11,955 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 21:23:11,956 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:12,153 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 430 proven. 222 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2019-11-06 21:23:12,154 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:12,154 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2019-11-06 21:23:12,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102808472] [2019-11-06 21:23:12,155 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:23:12,155 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:12,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:23:12,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=612, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:23:12,156 INFO L87 Difference]: Start difference. First operand 94 states and 110 transitions. Second operand 29 states. [2019-11-06 21:23:12,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:12,846 INFO L93 Difference]: Finished difference Result 286 states and 369 transitions. [2019-11-06 21:23:12,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-11-06 21:23:12,851 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 81 [2019-11-06 21:23:12,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:12,853 INFO L225 Difference]: With dead ends: 286 [2019-11-06 21:23:12,853 INFO L226 Difference]: Without dead ends: 232 [2019-11-06 21:23:12,858 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=752, Invalid=2440, Unknown=0, NotChecked=0, Total=3192 [2019-11-06 21:23:12,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2019-11-06 21:23:12,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 100. [2019-11-06 21:23:12,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-11-06 21:23:12,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 117 transitions. [2019-11-06 21:23:12,871 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 117 transitions. Word has length 81 [2019-11-06 21:23:12,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:12,873 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 117 transitions. [2019-11-06 21:23:12,873 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:23:12,873 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 117 transitions. [2019-11-06 21:23:12,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-06 21:23:12,874 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:12,874 INFO L410 BasicCegarLoop]: trace histogram [26, 25, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:13,078 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:13,079 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:13,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:13,080 INFO L82 PathProgramCache]: Analyzing trace with hash 910752347, now seen corresponding path program 14 times [2019-11-06 21:23:13,080 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:13,081 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986753083] [2019-11-06 21:23:13,081 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:13,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:13,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:13,256 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-06 21:23:13,256 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986753083] [2019-11-06 21:23:13,256 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930821741] [2019-11-06 21:23:13,257 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:13,317 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:13,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:13,319 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:23:13,320 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:13,547 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 505 proven. 260 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-11-06 21:23:13,548 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:13,548 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 31 [2019-11-06 21:23:13,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547753892] [2019-11-06 21:23:13,549 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:23:13,549 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:13,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:23:13,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=701, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:23:13,551 INFO L87 Difference]: Start difference. First operand 100 states and 117 transitions. Second operand 31 states. [2019-11-06 21:23:14,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:14,237 INFO L93 Difference]: Finished difference Result 308 states and 398 transitions. [2019-11-06 21:23:14,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-06 21:23:14,237 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2019-11-06 21:23:14,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:14,238 INFO L225 Difference]: With dead ends: 308 [2019-11-06 21:23:14,239 INFO L226 Difference]: Without dead ends: 251 [2019-11-06 21:23:14,240 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=858, Invalid=2802, Unknown=0, NotChecked=0, Total=3660 [2019-11-06 21:23:14,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-11-06 21:23:14,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 106. [2019-11-06 21:23:14,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-11-06 21:23:14,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2019-11-06 21:23:14,249 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 87 [2019-11-06 21:23:14,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:14,249 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2019-11-06 21:23:14,249 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:23:14,249 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2019-11-06 21:23:14,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-06 21:23:14,250 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:14,250 INFO L410 BasicCegarLoop]: trace histogram [28, 27, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:14,454 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:14,454 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:14,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:14,454 INFO L82 PathProgramCache]: Analyzing trace with hash 96928317, now seen corresponding path program 15 times [2019-11-06 21:23:14,455 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:14,455 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608450705] [2019-11-06 21:23:14,455 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:14,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:14,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:14,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-11-06 21:23:14,655 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608450705] [2019-11-06 21:23:14,655 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003438079] [2019-11-06 21:23:14,656 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:14,739 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-11-06 21:23:14,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:14,740 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:23:14,741 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:15,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 561 proven. 534 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-11-06 21:23:15,068 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:15,068 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2019-11-06 21:23:15,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197148080] [2019-11-06 21:23:15,068 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 21:23:15,069 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:15,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 21:23:15,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:23:15,070 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand 33 states. [2019-11-06 21:23:15,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:15,965 INFO L93 Difference]: Finished difference Result 435 states and 577 transitions. [2019-11-06 21:23:15,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-11-06 21:23:15,966 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 93 [2019-11-06 21:23:15,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:15,969 INFO L225 Difference]: With dead ends: 435 [2019-11-06 21:23:15,969 INFO L226 Difference]: Without dead ends: 430 [2019-11-06 21:23:15,971 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1235, Invalid=2797, Unknown=0, NotChecked=0, Total=4032 [2019-11-06 21:23:15,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2019-11-06 21:23:15,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 142. [2019-11-06 21:23:15,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-11-06 21:23:15,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 172 transitions. [2019-11-06 21:23:15,984 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 172 transitions. Word has length 93 [2019-11-06 21:23:15,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:15,985 INFO L462 AbstractCegarLoop]: Abstraction has 142 states and 172 transitions. [2019-11-06 21:23:15,985 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 21:23:15,986 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 172 transitions. [2019-11-06 21:23:15,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-11-06 21:23:15,988 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:15,989 INFO L410 BasicCegarLoop]: trace histogram [44, 43, 30, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:16,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:16,193 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:16,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:16,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1146565437, now seen corresponding path program 16 times [2019-11-06 21:23:16,194 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:16,195 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558050499] [2019-11-06 21:23:16,195 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:16,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:17,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:17,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1291 proven. 1547 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:23:17,353 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558050499] [2019-11-06 21:23:17,353 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026858187] [2019-11-06 21:23:17,353 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:17,441 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:23:17,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:17,443 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 44 conjunts are in the unsatisfiable core [2019-11-06 21:23:17,445 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:19,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 170 proven. 2667 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:23:19,170 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:19,170 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 45] total 103 [2019-11-06 21:23:19,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759159582] [2019-11-06 21:23:19,171 INFO L442 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-11-06 21:23:19,171 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:19,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-11-06 21:23:19,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1918, Invalid=8588, Unknown=0, NotChecked=0, Total=10506 [2019-11-06 21:23:19,174 INFO L87 Difference]: Start difference. First operand 142 states and 172 transitions. Second operand 103 states. [2019-11-06 21:23:20,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:20,093 INFO L93 Difference]: Finished difference Result 326 states and 415 transitions. [2019-11-06 21:23:20,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-11-06 21:23:20,094 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 141 [2019-11-06 21:23:20,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:20,095 INFO L225 Difference]: With dead ends: 326 [2019-11-06 21:23:20,097 INFO L226 Difference]: Without dead ends: 230 [2019-11-06 21:23:20,104 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4438 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3868, Invalid=13424, Unknown=0, NotChecked=0, Total=17292 [2019-11-06 21:23:20,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-11-06 21:23:20,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-11-06 21:23:20,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-11-06 21:23:20,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 259 transitions. [2019-11-06 21:23:20,116 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 259 transitions. Word has length 141 [2019-11-06 21:23:20,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:20,117 INFO L462 AbstractCegarLoop]: Abstraction has 229 states and 259 transitions. [2019-11-06 21:23:20,117 INFO L463 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-11-06 21:23:20,117 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 259 transitions. [2019-11-06 21:23:20,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-11-06 21:23:20,119 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:20,120 INFO L410 BasicCegarLoop]: trace histogram [73, 72, 43, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:20,323 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:20,324 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:20,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:20,324 INFO L82 PathProgramCache]: Analyzing trace with hash -1877929926, now seen corresponding path program 17 times [2019-11-06 21:23:20,325 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:20,325 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563159437] [2019-11-06 21:23:20,325 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:20,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:21,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 0 proven. 5089 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2019-11-06 21:23:21,198 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563159437] [2019-11-06 21:23:21,198 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456004244] [2019-11-06 21:23:21,199 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:21,412 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2019-11-06 21:23:21,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:21,414 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 45 conjunts are in the unsatisfiable core [2019-11-06 21:23:21,417 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:22,737 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 3842 proven. 2795 refuted. 0 times theorem prover too weak. 1247 trivial. 0 not checked. [2019-11-06 21:23:22,737 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:22,737 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 46] total 78 [2019-11-06 21:23:22,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138078809] [2019-11-06 21:23:22,738 INFO L442 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-11-06 21:23:22,738 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:22,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-11-06 21:23:22,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1535, Invalid=4471, Unknown=0, NotChecked=0, Total=6006 [2019-11-06 21:23:22,739 INFO L87 Difference]: Start difference. First operand 229 states and 259 transitions. Second operand 78 states. [2019-11-06 21:23:26,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:26,537 INFO L93 Difference]: Finished difference Result 1115 states and 1448 transitions. [2019-11-06 21:23:26,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2019-11-06 21:23:26,538 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 228 [2019-11-06 21:23:26,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:26,543 INFO L225 Difference]: With dead ends: 1115 [2019-11-06 21:23:26,543 INFO L226 Difference]: Without dead ends: 1019 [2019-11-06 21:23:26,546 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6257 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6773, Invalid=21283, Unknown=0, NotChecked=0, Total=28056 [2019-11-06 21:23:26,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2019-11-06 21:23:26,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 280. [2019-11-06 21:23:26,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-11-06 21:23:26,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 326 transitions. [2019-11-06 21:23:26,572 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 326 transitions. Word has length 228 [2019-11-06 21:23:26,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:26,573 INFO L462 AbstractCegarLoop]: Abstraction has 280 states and 326 transitions. [2019-11-06 21:23:26,573 INFO L463 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-11-06 21:23:26,573 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 326 transitions. [2019-11-06 21:23:26,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-11-06 21:23:26,579 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:26,579 INFO L410 BasicCegarLoop]: trace histogram [75, 74, 44, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:26,784 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:26,785 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:26,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:26,785 INFO L82 PathProgramCache]: Analyzing trace with hash 387565848, now seen corresponding path program 18 times [2019-11-06 21:23:26,785 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:26,786 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8211138] [2019-11-06 21:23:26,786 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:26,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:27,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:27,472 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 0 proven. 5399 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2019-11-06 21:23:27,472 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8211138] [2019-11-06 21:23:27,472 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711570747] [2019-11-06 21:23:27,472 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:27,644 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2019-11-06 21:23:27,644 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:27,647 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 46 conjunts are in the unsatisfiable core [2019-11-06 21:23:27,651 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:28,976 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 4064 proven. 2926 refuted. 0 times theorem prover too weak. 1335 trivial. 0 not checked. [2019-11-06 21:23:28,976 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:28,977 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 47] total 80 [2019-11-06 21:23:28,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333651894] [2019-11-06 21:23:28,977 INFO L442 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-11-06 21:23:28,978 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:28,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-11-06 21:23:28,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1613, Invalid=4707, Unknown=0, NotChecked=0, Total=6320 [2019-11-06 21:23:28,979 INFO L87 Difference]: Start difference. First operand 280 states and 326 transitions. Second operand 80 states. [2019-11-06 21:23:32,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:32,776 INFO L93 Difference]: Finished difference Result 1260 states and 1641 transitions. [2019-11-06 21:23:32,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2019-11-06 21:23:32,780 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 234 [2019-11-06 21:23:32,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:32,786 INFO L225 Difference]: With dead ends: 1260 [2019-11-06 21:23:32,786 INFO L226 Difference]: Without dead ends: 1116 [2019-11-06 21:23:32,788 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6557 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7083, Invalid=22329, Unknown=0, NotChecked=0, Total=29412 [2019-11-06 21:23:32,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2019-11-06 21:23:32,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 286. [2019-11-06 21:23:32,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-11-06 21:23:32,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 333 transitions. [2019-11-06 21:23:32,814 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 333 transitions. Word has length 234 [2019-11-06 21:23:32,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:32,815 INFO L462 AbstractCegarLoop]: Abstraction has 286 states and 333 transitions. [2019-11-06 21:23:32,815 INFO L463 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-11-06 21:23:32,815 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 333 transitions. [2019-11-06 21:23:32,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-11-06 21:23:32,818 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:32,818 INFO L410 BasicCegarLoop]: trace histogram [77, 76, 45, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:33,021 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:33,022 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:33,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:33,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1058539962, now seen corresponding path program 19 times [2019-11-06 21:23:33,023 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:33,024 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111779799] [2019-11-06 21:23:33,024 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:33,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:33,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 5718 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2019-11-06 21:23:33,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111779799] [2019-11-06 21:23:33,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226526265] [2019-11-06 21:23:33,941 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:34,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:34,078 INFO L256 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 47 conjunts are in the unsatisfiable core [2019-11-06 21:23:34,083 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 4292 proven. 3060 refuted. 0 times theorem prover too weak. 1426 trivial. 0 not checked. [2019-11-06 21:23:35,820 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:35,820 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 48] total 82 [2019-11-06 21:23:35,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949410540] [2019-11-06 21:23:35,821 INFO L442 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-11-06 21:23:35,821 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:35,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-11-06 21:23:35,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1693, Invalid=4949, Unknown=0, NotChecked=0, Total=6642 [2019-11-06 21:23:35,822 INFO L87 Difference]: Start difference. First operand 286 states and 333 transitions. Second operand 82 states. [2019-11-06 21:23:39,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:23:39,757 INFO L93 Difference]: Finished difference Result 1315 states and 1714 transitions. [2019-11-06 21:23:39,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2019-11-06 21:23:39,760 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 240 [2019-11-06 21:23:39,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:23:39,765 INFO L225 Difference]: With dead ends: 1315 [2019-11-06 21:23:39,765 INFO L226 Difference]: Without dead ends: 1168 [2019-11-06 21:23:39,767 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6864 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7400, Invalid=23400, Unknown=0, NotChecked=0, Total=30800 [2019-11-06 21:23:39,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2019-11-06 21:23:39,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 292. [2019-11-06 21:23:39,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-11-06 21:23:39,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 340 transitions. [2019-11-06 21:23:39,797 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 340 transitions. Word has length 240 [2019-11-06 21:23:39,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:23:39,798 INFO L462 AbstractCegarLoop]: Abstraction has 292 states and 340 transitions. [2019-11-06 21:23:39,798 INFO L463 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-11-06 21:23:39,798 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 340 transitions. [2019-11-06 21:23:39,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-11-06 21:23:39,801 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:23:39,801 INFO L410 BasicCegarLoop]: trace histogram [79, 78, 46, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:23:40,013 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:40,013 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:23:40,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:23:40,014 INFO L82 PathProgramCache]: Analyzing trace with hash -2101031912, now seen corresponding path program 20 times [2019-11-06 21:23:40,014 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:23:40,014 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377693893] [2019-11-06 21:23:40,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:23:40,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:40,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:23:40,636 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 0 proven. 6046 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2019-11-06 21:23:40,636 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377693893] [2019-11-06 21:23:40,636 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399158726] [2019-11-06 21:23:40,637 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:23:40,781 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:23:40,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:23:40,783 INFO L256 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 48 conjunts are in the unsatisfiable core [2019-11-06 21:23:40,785 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:23:42,236 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 4526 proven. 3197 refuted. 0 times theorem prover too weak. 1520 trivial. 0 not checked. [2019-11-06 21:23:42,236 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 21:23:42,236 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 49] total 84 [2019-11-06 21:23:42,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378902296] [2019-11-06 21:23:42,237 INFO L442 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-11-06 21:23:42,237 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:23:42,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-11-06 21:23:42,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=5197, Unknown=0, NotChecked=0, Total=6972 [2019-11-06 21:23:42,239 INFO L87 Difference]: Start difference. First operand 292 states and 340 transitions. Second operand 84 states.