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-acceleration/phases_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 11:46:23,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 11:46:23,407 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 11:46:23,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 11:46:23,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 11:46:23,429 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 11:46:23,429 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 11:46:23,431 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 11:46:23,431 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 11:46:23,432 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 11:46:23,434 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 11:46:23,436 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 11:46:23,438 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 11:46:23,439 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 11:46:23,440 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 11:46:23,441 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 11:46:23,443 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-05 11:46:23,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-05 11:46:23,453 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-05 11:46:23,453 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-05 11:46:23,454 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 [2019-09-05 11:46:23,469 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 11:46:23,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 11:46:23,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-05 11:46:23,471 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-05 11:46:23,471 INFO L138 SettingsManager]: * Use SBE=true [2019-09-05 11:46:23,471 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 11:46:23,471 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 11:46:23,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-05 11:46:23,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 11:46:23,472 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 11:46:23,472 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 11:46:23,472 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 11:46:23,473 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 11:46:23,473 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 11:46:23,473 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 11:46:23,473 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-05 11:46:23,473 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 11:46:23,474 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 11:46:23,474 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 11:46:23,474 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-05 11:46:23,474 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-05 11:46:23,474 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 11:46:23,475 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 11:46:23,475 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 11:46:23,475 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-05 11:46:23,475 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-05 11:46:23,476 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 11:46:23,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 11:46:23,476 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-05 11:46:23,505 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 11:46:23,518 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 11:46:23,521 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 11:46:23,522 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 11:46:23,523 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 11:46:23,523 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2019-09-05 11:46:23,590 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/140623722/60843069d10744c4b3c5aa33c0c323d4/FLAG24139bae7 [2019-09-05 11:46:24,055 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 11:46:24,058 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2019-09-05 11:46:24,064 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/140623722/60843069d10744c4b3c5aa33c0c323d4/FLAG24139bae7 [2019-09-05 11:46:24,397 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/140623722/60843069d10744c4b3c5aa33c0c323d4 [2019-09-05 11:46:24,407 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 11:46:24,408 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 11:46:24,409 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 11:46:24,409 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 11:46:24,413 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 11:46:24,413 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,415 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75dc0927 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24, skipping insertion in model container [2019-09-05 11:46:24,416 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,423 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 11:46:24,435 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 11:46:24,586 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:46:24,590 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 11:46:24,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 11:46:24,623 INFO L192 MainTranslator]: Completed translation [2019-09-05 11:46:24,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24 WrapperNode [2019-09-05 11:46:24,624 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 11:46:24,625 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 11:46:24,625 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 11:46:24,625 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 11:46:24,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,639 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,724 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,724 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,728 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (1/1) ... [2019-09-05 11:46:24,744 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 11:46:24,745 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 11:46:24,745 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 11:46:24,745 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 11:46:24,746 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (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 [2019-09-05 11:46:24,790 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 11:46:24,790 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 11:46:24,790 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 11:46:24,791 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 11:46:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 11:46:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 11:46:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 11:46:24,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 11:46:24,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 11:46:24,960 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 11:46:24,961 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 11:46:24,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:46:24 BoogieIcfgContainer [2019-09-05 11:46:24,962 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 11:46:24,963 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 11:46:24,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 11:46:24,966 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 11:46:24,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 11:46:24" (1/3) ... [2019-09-05 11:46:24,967 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4debe4ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:46:24, skipping insertion in model container [2019-09-05 11:46:24,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 11:46:24" (2/3) ... [2019-09-05 11:46:24,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4debe4ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 11:46:24, skipping insertion in model container [2019-09-05 11:46:24,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 11:46:24" (3/3) ... [2019-09-05 11:46:24,970 INFO L109 eAbstractionObserver]: Analyzing ICFG phases_1-2.c [2019-09-05 11:46:24,978 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 11:46:24,984 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 11:46:24,997 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 11:46:25,025 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-05 11:46:25,026 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 11:46:25,026 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-05 11:46:25,026 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 11:46:25,027 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 11:46:25,027 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 11:46:25,027 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 11:46:25,027 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 11:46:25,027 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 11:46:25,045 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2019-09-05 11:46:25,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:46:25,050 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:25,051 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:25,053 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:25,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:25,058 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2019-09-05 11:46:25,060 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:25,061 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:25,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:25,104 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:25,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,153 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:46:25,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 11:46:25,157 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 11:46:25,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 11:46:25,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 11:46:25,171 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2019-09-05 11:46:25,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:25,188 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2019-09-05 11:46:25,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 11:46:25,190 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-05 11:46:25,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:25,196 INFO L225 Difference]: With dead ends: 29 [2019-09-05 11:46:25,196 INFO L226 Difference]: Without dead ends: 12 [2019-09-05 11:46:25,199 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 11:46:25,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-05 11:46:25,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-05 11:46:25,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-05 11:46:25,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2019-09-05 11:46:25,243 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2019-09-05 11:46:25,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:25,244 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2019-09-05 11:46:25,244 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 11:46:25,245 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2019-09-05 11:46:25,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 11:46:25,246 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:25,247 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:25,248 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:25,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:25,249 INFO L82 PathProgramCache]: Analyzing trace with hash -730736584, now seen corresponding path program 1 times [2019-09-05 11:46:25,250 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:25,251 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:25,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:25,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:25,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,379 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 11:46:25,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-05 11:46:25,380 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-05 11:46:25,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-05 11:46:25,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:46:25,381 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 3 states. [2019-09-05 11:46:25,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:25,469 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2019-09-05 11:46:25,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-05 11:46:25,470 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-09-05 11:46:25,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:25,471 INFO L225 Difference]: With dead ends: 21 [2019-09-05 11:46:25,471 INFO L226 Difference]: Without dead ends: 14 [2019-09-05 11:46:25,472 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-05 11:46:25,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-05 11:46:25,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-05 11:46:25,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-05 11:46:25,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-09-05 11:46:25,477 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2019-09-05 11:46:25,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:25,478 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-09-05 11:46:25,478 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-05 11:46:25,478 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-09-05 11:46:25,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-05 11:46:25,479 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:25,479 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:25,479 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:25,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:25,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1082855947, now seen corresponding path program 1 times [2019-09-05 11:46:25,480 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:25,480 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:25,481 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:25,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:25,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:25,618 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:46:25,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:25,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:25,657 INFO L256 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-05 11:46:25,663 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:25,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:25,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-09-05 11:46:25,711 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 11:46:25,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 11:46:25,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-05 11:46:25,712 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2019-09-05 11:46:25,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:25,746 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2019-09-05 11:46:25,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-05 11:46:25,747 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2019-09-05 11:46:25,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:25,748 INFO L225 Difference]: With dead ends: 23 [2019-09-05 11:46:25,748 INFO L226 Difference]: Without dead ends: 16 [2019-09-05 11:46:25,749 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-09-05 11:46:25,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-05 11:46:25,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-05 11:46:25,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-05 11:46:25,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2019-09-05 11:46:25,754 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 12 [2019-09-05 11:46:25,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:25,755 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2019-09-05 11:46:25,755 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 11:46:25,755 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2019-09-05 11:46:25,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-05 11:46:25,756 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:25,756 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:25,756 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:25,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:25,757 INFO L82 PathProgramCache]: Analyzing trace with hash -167147406, now seen corresponding path program 2 times [2019-09-05 11:46:25,757 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:25,757 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:25,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:25,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:25,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:25,867 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:25,867 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:46:25,895 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:25,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:46:25,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:25,915 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-05 11:46:25,916 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:25,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:25,951 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:25,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-09-05 11:46:25,952 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-05 11:46:25,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-05 11:46:25,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-09-05 11:46:25,953 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 6 states. [2019-09-05 11:46:25,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:25,996 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2019-09-05 11:46:25,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-05 11:46:25,997 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-09-05 11:46:25,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:25,997 INFO L225 Difference]: With dead ends: 25 [2019-09-05 11:46:25,998 INFO L226 Difference]: Without dead ends: 18 [2019-09-05 11:46:25,998 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-09-05 11:46:25,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-09-05 11:46:26,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-09-05 11:46:26,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-09-05 11:46:26,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-09-05 11:46:26,003 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 14 [2019-09-05 11:46:26,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:26,004 INFO L475 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-09-05 11:46:26,004 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-05 11:46:26,004 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-09-05 11:46:26,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-05 11:46:26,005 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:26,005 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:26,006 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:26,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:26,006 INFO L82 PathProgramCache]: Analyzing trace with hash -639535185, now seen corresponding path program 3 times [2019-09-05 11:46:26,006 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:26,006 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:26,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,008 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:26,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:26,151 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:26,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:26,152 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:26,170 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:46:26,185 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 11:46:26,185 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:26,186 INFO L256 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-05 11:46:26,188 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:26,212 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-05 11:46:26,220 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-05 11:46:26,221 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2019-09-05 11:46:26,221 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-05 11:46:26,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-05 11:46:26,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2019-09-05 11:46:26,222 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2019-09-05 11:46:26,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:26,292 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2019-09-05 11:46:26,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 11:46:26,293 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2019-09-05 11:46:26,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:26,294 INFO L225 Difference]: With dead ends: 29 [2019-09-05 11:46:26,294 INFO L226 Difference]: Without dead ends: 22 [2019-09-05 11:46:26,295 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-09-05 11:46:26,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-05 11:46:26,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2019-09-05 11:46:26,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-09-05 11:46:26,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-09-05 11:46:26,300 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2019-09-05 11:46:26,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:26,301 INFO L475 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-09-05 11:46:26,301 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-05 11:46:26,301 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-09-05 11:46:26,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-09-05 11:46:26,302 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:26,302 INFO L399 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:26,302 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:26,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:26,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1988642215, now seen corresponding path program 1 times [2019-09-05 11:46:26,303 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:26,303 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:26,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,305 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:26,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:26,509 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:26,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:26,510 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:26,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:26,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:26,544 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-05 11:46:26,546 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:26,589 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:26,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:26,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-09-05 11:46:26,593 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-05 11:46:26,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-05 11:46:26,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 11:46:26,594 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 8 states. [2019-09-05 11:46:26,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:26,658 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2019-09-05 11:46:26,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-05 11:46:26,658 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2019-09-05 11:46:26,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:26,659 INFO L225 Difference]: With dead ends: 31 [2019-09-05 11:46:26,659 INFO L226 Difference]: Without dead ends: 23 [2019-09-05 11:46:26,660 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-09-05 11:46:26,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-05 11:46:26,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-09-05 11:46:26,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-09-05 11:46:26,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-09-05 11:46:26,665 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2019-09-05 11:46:26,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:26,665 INFO L475 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-09-05 11:46:26,665 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-05 11:46:26,666 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-09-05 11:46:26,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-05 11:46:26,666 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:26,666 INFO L399 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:26,667 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:26,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:26,667 INFO L82 PathProgramCache]: Analyzing trace with hash 1766658852, now seen corresponding path program 2 times [2019-09-05 11:46:26,667 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:26,667 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:26,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,668 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:46:26,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:26,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:26,796 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:26,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:26,797 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:26,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:46:26,824 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:46:26,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:26,825 INFO L256 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-05 11:46:26,827 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:26,866 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:26,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:26,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 10 [2019-09-05 11:46:26,870 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-05 11:46:26,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-05 11:46:26,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-09-05 11:46:26,871 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 10 states. [2019-09-05 11:46:26,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:26,999 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2019-09-05 11:46:27,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 11:46:27,000 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2019-09-05 11:46:27,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:27,001 INFO L225 Difference]: With dead ends: 33 [2019-09-05 11:46:27,001 INFO L226 Difference]: Without dead ends: 25 [2019-09-05 11:46:27,002 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-09-05 11:46:27,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-09-05 11:46:27,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-09-05 11:46:27,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-09-05 11:46:27,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2019-09-05 11:46:27,007 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2019-09-05 11:46:27,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:27,008 INFO L475 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2019-09-05 11:46:27,008 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-05 11:46:27,008 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2019-09-05 11:46:27,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-09-05 11:46:27,009 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:27,009 INFO L399 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:27,009 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:27,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:27,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1105955487, now seen corresponding path program 3 times [2019-09-05 11:46:27,010 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:27,010 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:27,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:27,011 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:27,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:27,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:27,160 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:27,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:27,160 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:27,176 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:46:27,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-05 11:46:27,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:27,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-05 11:46:27,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:27,228 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 18 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (7)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:46:27,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:27,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2019-09-05 11:46:27,233 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 11:46:27,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 11:46:27,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:46:27,234 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 11 states. [2019-09-05 11:46:28,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:28,897 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2019-09-05 11:46:28,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-05 11:46:28,897 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2019-09-05 11:46:28,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:28,898 INFO L225 Difference]: With dead ends: 40 [2019-09-05 11:46:28,898 INFO L226 Difference]: Without dead ends: 32 [2019-09-05 11:46:28,899 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2019-09-05 11:46:28,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-09-05 11:46:28,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2019-09-05 11:46:28,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-09-05 11:46:28,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-09-05 11:46:28,904 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-09-05 11:46:28,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:28,905 INFO L475 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-09-05 11:46:28,905 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 11:46:28,905 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-09-05 11:46:28,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-05 11:46:28,906 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:28,906 INFO L399 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:28,906 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:28,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:28,907 INFO L82 PathProgramCache]: Analyzing trace with hash -806317607, now seen corresponding path program 4 times [2019-09-05 11:46:28,907 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:28,907 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:28,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:28,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:28,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:28,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:29,068 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 11:46:29,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:29,068 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:46:29,085 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:29,099 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:46:29,100 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:29,101 INFO L256 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 18 conjunts are in the unsatisfiable core [2019-09-05 11:46:29,111 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:29,156 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 11:46:29,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:29,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-09-05 11:46:29,160 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-05 11:46:29,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-05 11:46:29,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:46:29,162 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 11 states. [2019-09-05 11:46:29,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:29,284 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2019-09-05 11:46:29,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 11:46:29,285 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2019-09-05 11:46:29,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:29,286 INFO L225 Difference]: With dead ends: 41 [2019-09-05 11:46:29,286 INFO L226 Difference]: Without dead ends: 31 [2019-09-05 11:46:29,288 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-09-05 11:46:29,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-05 11:46:29,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-09-05 11:46:29,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-09-05 11:46:29,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2019-09-05 11:46:29,293 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 28 [2019-09-05 11:46:29,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:29,294 INFO L475 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2019-09-05 11:46:29,294 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-05 11:46:29,294 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2019-09-05 11:46:29,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-09-05 11:46:29,295 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:29,295 INFO L399 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:29,295 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:29,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:29,296 INFO L82 PathProgramCache]: Analyzing trace with hash -251489706, now seen corresponding path program 5 times [2019-09-05 11:46:29,296 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:29,296 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:29,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:29,297 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:29,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:29,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:29,474 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 11:46:29,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:29,475 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:29,494 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:46:55,101 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-09-05 11:46:55,101 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:55,148 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 22 conjunts are in the unsatisfiable core [2019-09-05 11:46:55,150 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:55,245 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:46:55,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:55,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 13 [2019-09-05 11:46:55,252 INFO L454 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-09-05 11:46:55,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-09-05 11:46:55,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2019-09-05 11:46:55,253 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 13 states. [2019-09-05 11:46:55,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:46:55,434 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2019-09-05 11:46:55,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-05 11:46:55,435 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2019-09-05 11:46:55,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:46:55,436 INFO L225 Difference]: With dead ends: 43 [2019-09-05 11:46:55,436 INFO L226 Difference]: Without dead ends: 33 [2019-09-05 11:46:55,437 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2019-09-05 11:46:55,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-09-05 11:46:55,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-09-05 11:46:55,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-09-05 11:46:55,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-09-05 11:46:55,446 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2019-09-05 11:46:55,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:46:55,446 INFO L475 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-09-05 11:46:55,446 INFO L476 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-09-05 11:46:55,446 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-09-05 11:46:55,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-09-05 11:46:55,448 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:46:55,448 INFO L399 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:46:55,448 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:46:55,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:46:55,449 INFO L82 PathProgramCache]: Analyzing trace with hash 362178451, now seen corresponding path program 6 times [2019-09-05 11:46:55,449 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:46:55,449 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:46:55,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:55,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:46:55,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:46:55,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:46:55,636 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 11:46:55,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:46:55,636 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:46:55,652 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:46:56,646 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-09-05 11:46:56,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:46:56,652 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-05 11:46:56,654 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:46:56,738 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 56 proven. 9 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-09-05 11:46:56,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:46:56,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2019-09-05 11:46:56,744 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-05 11:46:56,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-05 11:46:56,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2019-09-05 11:46:56,744 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 16 states. [2019-09-05 11:47:04,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:47:04,764 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-09-05 11:47:04,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-05 11:47:04,764 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 32 [2019-09-05 11:47:04,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:47:04,767 INFO L225 Difference]: With dead ends: 54 [2019-09-05 11:47:04,767 INFO L226 Difference]: Without dead ends: 44 [2019-09-05 11:47:04,768 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=115, Invalid=304, Unknown=1, NotChecked=0, Total=420 [2019-09-05 11:47:04,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-09-05 11:47:04,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2019-09-05 11:47:04,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-09-05 11:47:04,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-09-05 11:47:04,774 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 32 [2019-09-05 11:47:04,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:47:04,774 INFO L475 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-09-05 11:47:04,774 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-05 11:47:04,774 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-09-05 11:47:04,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-09-05 11:47:04,775 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:47:04,775 INFO L399 BasicCegarLoop]: trace histogram [13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:47:04,775 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:47:04,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:47:04,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1390824821, now seen corresponding path program 7 times [2019-09-05 11:47:04,776 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:47:04,776 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:47:04,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:04,777 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:47:04,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:04,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:04,962 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-05 11:47:04,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:47:04,962 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:47:04,973 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:47:04,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:04,989 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 24 conjunts are in the unsatisfiable core [2019-09-05 11:47:04,991 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:47:05,048 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-05 11:47:05,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:47:05,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-09-05 11:47:05,053 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-05 11:47:05,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-05 11:47:05,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-05 11:47:05,054 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 14 states. [2019-09-05 11:47:05,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:47:05,275 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2019-09-05 11:47:05,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-09-05 11:47:05,276 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2019-09-05 11:47:05,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:47:05,277 INFO L225 Difference]: With dead ends: 51 [2019-09-05 11:47:05,277 INFO L226 Difference]: Without dead ends: 39 [2019-09-05 11:47:05,277 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2019-09-05 11:47:05,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-09-05 11:47:05,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-09-05 11:47:05,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-09-05 11:47:05,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-09-05 11:47:05,281 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 36 [2019-09-05 11:47:05,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:47:05,282 INFO L475 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-09-05 11:47:05,282 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-05 11:47:05,282 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-09-05 11:47:05,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-09-05 11:47:05,283 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:47:05,283 INFO L399 BasicCegarLoop]: trace histogram [14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:47:05,283 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:47:05,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:47:05,284 INFO L82 PathProgramCache]: Analyzing trace with hash 26600968, now seen corresponding path program 8 times [2019-09-05 11:47:05,284 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:47:05,284 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:47:05,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:05,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:47:05,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:05,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:05,495 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 60 proven. 132 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-05 11:47:05,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:47:05,495 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:47:05,508 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-05 11:47:05,524 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:47:05,524 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:47:05,525 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-05 11:47:05,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:47:05,619 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 11:47:05,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:47:05,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 18 [2019-09-05 11:47:05,624 INFO L454 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-09-05 11:47:05,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-09-05 11:47:05,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2019-09-05 11:47:05,624 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 18 states. [2019-09-05 11:47:05,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:47:05,941 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2019-09-05 11:47:05,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-05 11:47:05,942 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2019-09-05 11:47:05,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:47:05,943 INFO L225 Difference]: With dead ends: 53 [2019-09-05 11:47:05,943 INFO L226 Difference]: Without dead ends: 41 [2019-09-05 11:47:05,944 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2019-09-05 11:47:05,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-05 11:47:05,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-09-05 11:47:05,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-09-05 11:47:05,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2019-09-05 11:47:05,949 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 38 [2019-09-05 11:47:05,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:47:05,949 INFO L475 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2019-09-05 11:47:05,949 INFO L476 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-09-05 11:47:05,949 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2019-09-05 11:47:05,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-05 11:47:05,950 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:47:05,950 INFO L399 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:47:05,951 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:47:05,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:47:05,951 INFO L82 PathProgramCache]: Analyzing trace with hash 668151365, now seen corresponding path program 9 times [2019-09-05 11:47:05,951 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:47:05,951 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:47:05,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:05,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:47:05,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:05,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-05 11:47:06,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:47:06,146 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:47:06,161 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:47:06,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-09-05 11:47:06,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:47:06,191 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-05 11:47:06,192 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:47:06,302 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 84 proven. 9 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-09-05 11:47:06,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:47:06,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6] total 19 [2019-09-05 11:47:06,306 INFO L454 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-09-05 11:47:06,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-09-05 11:47:06,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2019-09-05 11:47:06,307 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 19 states. [2019-09-05 11:47:12,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:47:12,573 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2019-09-05 11:47:12,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-05 11:47:12,574 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 40 [2019-09-05 11:47:12,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:47:12,575 INFO L225 Difference]: With dead ends: 64 [2019-09-05 11:47:12,575 INFO L226 Difference]: Without dead ends: 52 [2019-09-05 11:47:12,576 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=156, Invalid=444, Unknown=0, NotChecked=0, Total=600 [2019-09-05 11:47:12,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-09-05 11:47:12,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2019-09-05 11:47:12,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-09-05 11:47:12,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2019-09-05 11:47:12,581 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 40 [2019-09-05 11:47:12,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:47:12,582 INFO L475 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2019-09-05 11:47:12,582 INFO L476 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-09-05 11:47:12,582 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2019-09-05 11:47:12,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-09-05 11:47:12,583 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:47:12,583 INFO L399 BasicCegarLoop]: trace histogram [17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:47:12,583 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:47:12,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:47:12,583 INFO L82 PathProgramCache]: Analyzing trace with hash 2096596925, now seen corresponding path program 10 times [2019-09-05 11:47:12,583 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:47:12,584 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:47:12,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:12,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:47:12,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:12,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 182 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:47:12,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:47:12,834 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:47:12,846 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:47:12,865 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:47:12,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:47:12,867 INFO L256 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-05 11:47:12,868 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:47:12,928 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 182 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:47:12,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:47:12,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-09-05 11:47:12,932 INFO L454 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-09-05 11:47:12,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-09-05 11:47:12,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:47:12,933 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 17 states. [2019-09-05 11:47:13,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:47:13,277 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2019-09-05 11:47:13,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-05 11:47:13,278 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 44 [2019-09-05 11:47:13,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:47:13,279 INFO L225 Difference]: With dead ends: 61 [2019-09-05 11:47:13,279 INFO L226 Difference]: Without dead ends: 47 [2019-09-05 11:47:13,279 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-09-05 11:47:13,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-05 11:47:13,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-09-05 11:47:13,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-09-05 11:47:13,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2019-09-05 11:47:13,284 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 44 [2019-09-05 11:47:13,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:47:13,285 INFO L475 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2019-09-05 11:47:13,285 INFO L476 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-09-05 11:47:13,285 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2019-09-05 11:47:13,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-09-05 11:47:13,286 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:47:13,286 INFO L399 BasicCegarLoop]: trace histogram [18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:47:13,286 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:47:13,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:47:13,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1661276614, now seen corresponding path program 11 times [2019-09-05 11:47:13,286 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:47:13,286 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:47:13,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:13,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:47:13,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:47:13,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:47:13,527 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 105 proven. 210 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:47:13,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:47:13,528 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:47:13,539 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-05 11:49:15,332 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2019-09-05 11:49:15,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:49:18,251 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 32 conjunts are in the unsatisfiable core [2019-09-05 11:49:18,252 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:49:18,301 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 105 proven. 210 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:49:18,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:49:18,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-09-05 11:49:18,308 INFO L454 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-09-05 11:49:18,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-09-05 11:49:18,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2019-09-05 11:49:18,309 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 18 states. [2019-09-05 11:49:18,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:49:18,695 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2019-09-05 11:49:18,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-05 11:49:18,695 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 46 [2019-09-05 11:49:18,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:49:18,696 INFO L225 Difference]: With dead ends: 63 [2019-09-05 11:49:18,696 INFO L226 Difference]: Without dead ends: 49 [2019-09-05 11:49:18,697 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2019-09-05 11:49:18,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-09-05 11:49:18,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-09-05 11:49:18,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-09-05 11:49:18,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2019-09-05 11:49:18,705 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 46 [2019-09-05 11:49:18,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:49:18,705 INFO L475 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2019-09-05 11:49:18,705 INFO L476 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-09-05 11:49:18,706 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2019-09-05 11:49:18,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-09-05 11:49:18,709 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:49:18,709 INFO L399 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:49:18,709 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:49:18,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:49:18,710 INFO L82 PathProgramCache]: Analyzing trace with hash -910251657, now seen corresponding path program 12 times [2019-09-05 11:49:18,710 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:49:18,710 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:49:18,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:49:18,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:49:18,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:49:18,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:49:19,009 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-09-05 11:49:19,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:49:19,009 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:49:19,028 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-05 11:51:32,208 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-09-05 11:51:32,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:51:32,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 22 conjunts are in the unsatisfiable core [2019-09-05 11:51:32,391 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:51:32,650 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 81 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-09-05 11:51:32,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:51:32,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12] total 28 [2019-09-05 11:51:32,657 INFO L454 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-09-05 11:51:32,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-09-05 11:51:32,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2019-09-05 11:51:32,658 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 28 states. [2019-09-05 11:51:35,624 WARN L188 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 44 DAG size of output: 12 [2019-09-05 11:51:38,000 WARN L188 SmtUtils]: Spent 882.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2019-09-05 11:51:50,492 WARN L188 SmtUtils]: Spent 6.80 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2019-09-05 11:52:02,997 WARN L188 SmtUtils]: Spent 4.93 s on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2019-09-05 11:52:07,616 WARN L188 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2019-09-05 11:52:44,811 WARN L188 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2019-09-05 11:52:54,458 WARN L188 SmtUtils]: Spent 3.89 s on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2019-09-05 11:53:14,019 WARN L188 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2019-09-05 11:53:24,920 WARN L188 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2019-09-05 11:53:35,238 WARN L188 SmtUtils]: Spent 5.16 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2019-09-05 11:53:35,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:53:35,239 INFO L93 Difference]: Finished difference Result 91 states and 116 transitions. [2019-09-05 11:53:35,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-05 11:53:35,240 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 48 [2019-09-05 11:53:35,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:53:35,241 INFO L225 Difference]: With dead ends: 91 [2019-09-05 11:53:35,241 INFO L226 Difference]: Without dead ends: 77 [2019-09-05 11:53:35,243 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 99.5s TimeCoverageRelationStatistics Valid=418, Invalid=1463, Unknown=11, NotChecked=0, Total=1892 [2019-09-05 11:53:35,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-09-05 11:53:35,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 57. [2019-09-05 11:53:35,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-09-05 11:53:35,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2019-09-05 11:53:35,262 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 48 [2019-09-05 11:53:35,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:53:35,262 INFO L475 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2019-09-05 11:53:35,262 INFO L476 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-09-05 11:53:35,262 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2019-09-05 11:53:35,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-09-05 11:53:35,263 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:53:35,263 INFO L399 BasicCegarLoop]: trace histogram [23, 16, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:53:35,263 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:53:35,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:53:35,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1746680101, now seen corresponding path program 13 times [2019-09-05 11:53:35,264 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:53:35,264 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:53:35,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:35,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:53:35,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:53:35,637 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 221 proven. 272 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-09-05 11:53:35,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:53:35,637 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:53:35,658 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:53:35,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:53:35,678 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 36 conjunts are in the unsatisfiable core [2019-09-05 11:53:35,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:53:35,742 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 221 proven. 272 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (17)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:53:35,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:53:35,748 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2019-09-05 11:53:35,748 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-05 11:53:35,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-05 11:53:35,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-05 11:53:35,749 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand 20 states. [2019-09-05 11:53:36,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:53:36,165 INFO L93 Difference]: Finished difference Result 79 states and 94 transitions. [2019-09-05 11:53:36,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-09-05 11:53:36,166 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2019-09-05 11:53:36,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:53:36,167 INFO L225 Difference]: With dead ends: 79 [2019-09-05 11:53:36,167 INFO L226 Difference]: Without dead ends: 59 [2019-09-05 11:53:36,168 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2019-09-05 11:53:36,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-09-05 11:53:36,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-09-05 11:53:36,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-05 11:53:36,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2019-09-05 11:53:36,174 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 56 [2019-09-05 11:53:36,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:53:36,175 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2019-09-05 11:53:36,175 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-05 11:53:36,175 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2019-09-05 11:53:36,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-05 11:53:36,176 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:53:36,176 INFO L399 BasicCegarLoop]: trace histogram [24, 17, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:53:36,176 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:53:36,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:53:36,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1177603106, now seen corresponding path program 14 times [2019-09-05 11:53:36,176 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:53:36,176 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:53:36,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:36,177 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 11:53:36,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:53:36,679 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 234 proven. 306 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-09-05 11:53:36,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:53:36,679 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:53:36,698 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:53:36,720 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-05 11:53:36,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:53:36,722 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 51 conjunts are in the unsatisfiable core [2019-09-05 11:53:36,724 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:53:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (18)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:53:36,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:53:36,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 27] total 28 [2019-09-05 11:53:36,932 INFO L454 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-09-05 11:53:36,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-09-05 11:53:36,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2019-09-05 11:53:36,933 INFO L87 Difference]: Start difference. First operand 59 states and 66 transitions. Second operand 28 states. [2019-09-05 11:53:37,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:53:37,630 INFO L93 Difference]: Finished difference Result 81 states and 96 transitions. [2019-09-05 11:53:37,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-05 11:53:37,631 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 58 [2019-09-05 11:53:37,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:53:37,632 INFO L225 Difference]: With dead ends: 81 [2019-09-05 11:53:37,632 INFO L226 Difference]: Without dead ends: 61 [2019-09-05 11:53:37,633 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=71, Invalid=685, Unknown=0, NotChecked=0, Total=756 [2019-09-05 11:53:37,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-09-05 11:53:37,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-09-05 11:53:37,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-09-05 11:53:37,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2019-09-05 11:53:37,639 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 58 [2019-09-05 11:53:37,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:53:37,639 INFO L475 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2019-09-05 11:53:37,639 INFO L476 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-09-05 11:53:37,639 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2019-09-05 11:53:37,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-09-05 11:53:37,640 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:53:37,640 INFO L399 BasicCegarLoop]: trace histogram [25, 18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:53:37,640 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:53:37,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:53:37,641 INFO L82 PathProgramCache]: Analyzing trace with hash -244542497, now seen corresponding path program 15 times [2019-09-05 11:53:37,641 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:53:37,641 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:53:37,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:37,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:53:37,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:53:37,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:53:38,001 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 247 proven. 342 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-09-05 11:53:38,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:53:38,001 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:53:38,011 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 11:54:59,056 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-09-05 11:54:59,057 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:54:59,873 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 22 conjunts are in the unsatisfiable core [2019-09-05 11:54:59,874 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:55:14,929 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 270 proven. 44 refuted. 5 times theorem prover too weak. 306 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (19)] Exception during sending of exit command (exit): Broken pipe [2019-09-05 11:55:14,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:55:14,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 10] total 29 [2019-09-05 11:55:14,936 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-05 11:55:14,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-05 11:55:14,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=702, Unknown=5, NotChecked=0, Total=812 [2019-09-05 11:55:14,937 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 29 states. [2019-09-05 11:55:20,701 WARN L188 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2019-09-05 11:55:32,597 WARN L188 SmtUtils]: Spent 4.09 s on a formula simplification that was a NOOP. DAG size: 20 [2019-09-05 11:55:44,320 WARN L188 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2019-09-05 11:56:13,855 WARN L188 SmtUtils]: Spent 751.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2019-09-05 11:56:27,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:56:27,206 INFO L93 Difference]: Finished difference Result 88 states and 107 transitions. [2019-09-05 11:56:27,214 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-09-05 11:56:27,214 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2019-09-05 11:56:27,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:56:27,215 INFO L225 Difference]: With dead ends: 88 [2019-09-05 11:56:27,215 INFO L226 Difference]: Without dead ends: 68 [2019-09-05 11:56:27,216 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 49.3s TimeCoverageRelationStatistics Valid=169, Invalid=1149, Unknown=14, NotChecked=0, Total=1332 [2019-09-05 11:56:27,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-05 11:56:27,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2019-09-05 11:56:27,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-09-05 11:56:27,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2019-09-05 11:56:27,222 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 60 [2019-09-05 11:56:27,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:56:27,223 INFO L475 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2019-09-05 11:56:27,223 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-05 11:56:27,223 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2019-09-05 11:56:27,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-09-05 11:56:27,224 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:56:27,224 INFO L399 BasicCegarLoop]: trace histogram [27, 19, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:56:27,224 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:56:27,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:56:27,225 INFO L82 PathProgramCache]: Analyzing trace with hash 545304151, now seen corresponding path program 16 times [2019-09-05 11:56:27,225 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:56:27,225 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:56:27,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:27,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:56:27,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:27,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:27,549 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 300 proven. 380 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-09-05 11:56:27,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:56:27,549 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 11:56:27,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 11:56:27,582 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 11:56:27,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 11:56:27,583 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 42 conjunts are in the unsatisfiable core [2019-09-05 11:56:27,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 11:56:27,665 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 300 proven. 380 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-09-05 11:56:27,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 11:56:27,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2019-09-05 11:56:27,669 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-05 11:56:27,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-05 11:56:27,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:56:27,670 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 23 states. [2019-09-05 11:56:28,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 11:56:28,232 INFO L93 Difference]: Finished difference Result 91 states and 100 transitions. [2019-09-05 11:56:28,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-05 11:56:28,233 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 64 [2019-09-05 11:56:28,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 11:56:28,234 INFO L225 Difference]: With dead ends: 91 [2019-09-05 11:56:28,234 INFO L226 Difference]: Without dead ends: 68 [2019-09-05 11:56:28,235 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2019-09-05 11:56:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-09-05 11:56:28,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-09-05 11:56:28,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-09-05 11:56:28,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2019-09-05 11:56:28,242 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 64 [2019-09-05 11:56:28,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 11:56:28,242 INFO L475 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2019-09-05 11:56:28,242 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-05 11:56:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2019-09-05 11:56:28,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-09-05 11:56:28,243 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 11:56:28,243 INFO L399 BasicCegarLoop]: trace histogram [28, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 11:56:28,243 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 11:56:28,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 11:56:28,244 INFO L82 PathProgramCache]: Analyzing trace with hash 965014612, now seen corresponding path program 17 times [2019-09-05 11:56:28,244 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-05 11:56:28,244 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-05 11:56:28,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:28,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 11:56:28,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 11:56:28,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 11:56:28,798 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 315 proven. 420 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-09-05 11:56:28,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 11:56:28,798 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 11:56:28,821 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000