java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 12:58:27,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 12:58:27,716 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 12:58:27,732 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-20 12:58:27,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-20 12:58:27,734 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-20 12:58:27,736 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-20 12:58:27,748 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-20 12:58:27,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-20 12:58:27,751 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-20 12:58:27,753 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-20 12:58:27,756 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-20 12:58:27,756 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-20 12:58:27,757 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-20 12:58:27,758 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-20 12:58:27,759 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-20 12:58:27,763 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-20 12:58:27,765 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-20 12:58:27,769 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-20 12:58:27,772 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-20 12:58:27,778 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-20 12:58:27,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-20 12:58:27,781 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-20 12:58:27,783 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-20 12:58:27,785 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-20 12:58:27,798 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 12:58:27,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 12:58:27,802 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 12:58:27,803 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 [2019-09-20 12:58:27,827 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 12:58:27,827 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 12:58:27,829 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-20 12:58:27,830 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-20 12:58:27,830 INFO L138 SettingsManager]: * Use SBE=true [2019-09-20 12:58:27,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 12:58:27,830 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 12:58:27,831 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-20 12:58:27,831 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 12:58:27,831 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 12:58:27,832 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 12:58:27,832 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 12:58:27,832 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 12:58:27,833 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 12:58:27,833 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 12:58:27,833 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-20 12:58:27,833 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 12:58:27,834 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 12:58:27,834 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 12:58:27,834 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-20 12:58:27,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-20 12:58:27,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 12:58:27,835 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 12:58:27,835 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 12:58:27,835 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-20 12:58:27,835 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-20 12:58:27,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 12:58:27,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-20 12:58:27,836 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 12:58:27,885 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 12:58:27,897 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 12:58:27,901 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 12:58:27,902 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 12:58:27,902 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 12:58:27,903 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2019-09-20 12:58:27,968 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/280fbd806/6988221d976043bcaa84d7c3967337b4/FLAG83625f103 [2019-09-20 12:58:28,449 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 12:58:28,450 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2019-09-20 12:58:28,457 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/280fbd806/6988221d976043bcaa84d7c3967337b4/FLAG83625f103 [2019-09-20 12:58:28,832 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/280fbd806/6988221d976043bcaa84d7c3967337b4 [2019-09-20 12:58:28,843 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 12:58:28,844 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 12:58:28,845 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 12:58:28,845 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 12:58:28,850 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 12:58:28,851 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 12:58:28" (1/1) ... [2019-09-20 12:58:28,854 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e6c2b37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:28, skipping insertion in model container [2019-09-20 12:58:28,854 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 12:58:28" (1/1) ... [2019-09-20 12:58:28,862 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 12:58:28,882 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 12:58:29,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 12:58:29,057 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 12:58:29,078 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 12:58:29,093 INFO L192 MainTranslator]: Completed translation [2019-09-20 12:58:29,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29 WrapperNode [2019-09-20 12:58:29,094 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 12:58:29,095 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 12:58:29,095 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 12:58:29,095 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 12:58:29,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,195 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,199 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,203 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,204 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (1/1) ... [2019-09-20 12:58:29,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 12:58:29,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 12:58:29,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 12:58:29,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 12:58:29,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (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 [2019-09-20 12:58:29,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 12:58:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 12:58:29,260 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 12:58:29,261 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 12:58:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 12:58:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-20 12:58:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 12:58:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-20 12:58:29,261 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 12:58:29,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 12:58:29,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 12:58:29,428 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 12:58:29,429 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-20 12:58:29,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 12:58:29 BoogieIcfgContainer [2019-09-20 12:58:29,430 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 12:58:29,431 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 12:58:29,432 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 12:58:29,435 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 12:58:29,435 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 12:58:28" (1/3) ... [2019-09-20 12:58:29,436 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c6d9ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 12:58:29, skipping insertion in model container [2019-09-20 12:58:29,436 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 12:58:29" (2/3) ... [2019-09-20 12:58:29,437 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c6d9ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 12:58:29, skipping insertion in model container [2019-09-20 12:58:29,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 12:58:29" (3/3) ... [2019-09-20 12:58:29,439 INFO L109 eAbstractionObserver]: Analyzing ICFG gr2006.i [2019-09-20 12:58:29,450 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 12:58:29,459 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 12:58:29,478 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 12:58:29,535 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-20 12:58:29,536 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 12:58:29,536 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-20 12:58:29,536 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 12:58:29,537 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 12:58:29,537 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 12:58:29,537 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 12:58:29,537 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 12:58:29,537 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 12:58:29,565 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-09-20 12:58:29,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 12:58:29,571 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:29,572 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:29,575 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:29,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:29,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1001202113, now seen corresponding path program 1 times [2019-09-20 12:58:29,588 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:29,589 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:29,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:29,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:29,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:29,688 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:58:29,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-20 12:58:29,691 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-20 12:58:29,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-20 12:58:29,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-20 12:58:29,704 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-09-20 12:58:29,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:29,723 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-09-20 12:58:29,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-20 12:58:29,724 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-20 12:58:29,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:29,731 INFO L225 Difference]: With dead ends: 32 [2019-09-20 12:58:29,731 INFO L226 Difference]: Without dead ends: 13 [2019-09-20 12:58:29,735 INFO L636 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 [2019-09-20 12:58:29,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-20 12:58:29,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-20 12:58:29,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-20 12:58:29,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-09-20 12:58:29,770 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-09-20 12:58:29,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:29,771 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-09-20 12:58:29,771 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-20 12:58:29,771 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-09-20 12:58:29,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-20 12:58:29,772 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:29,772 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:29,773 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:29,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:29,773 INFO L82 PathProgramCache]: Analyzing trace with hash 563077882, now seen corresponding path program 1 times [2019-09-20 12:58:29,773 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:29,774 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:29,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:29,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:29,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:29,831 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:58:29,831 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-20 12:58:29,832 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 12:58:29,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 12:58:29,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:29,833 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2019-09-20 12:58:29,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:29,885 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-09-20 12:58:29,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 12:58:29,886 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-09-20 12:58:29,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:29,887 INFO L225 Difference]: With dead ends: 22 [2019-09-20 12:58:29,887 INFO L226 Difference]: Without dead ends: 17 [2019-09-20 12:58:29,888 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:29,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-20 12:58:29,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-20 12:58:29,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-20 12:58:29,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-09-20 12:58:29,893 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-09-20 12:58:29,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:29,894 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-09-20 12:58:29,894 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 12:58:29,894 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-09-20 12:58:29,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-20 12:58:29,895 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:29,895 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:29,895 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:29,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:29,896 INFO L82 PathProgramCache]: Analyzing trace with hash 620336184, now seen corresponding path program 1 times [2019-09-20 12:58:29,896 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:29,896 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:29,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:29,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:29,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:29,941 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 12:58:29,941 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-20 12:58:29,942 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-20 12:58:29,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-20 12:58:29,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-20 12:58:29,942 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-09-20 12:58:29,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:29,955 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-09-20 12:58:29,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-20 12:58:29,956 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-09-20 12:58:29,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:29,957 INFO L225 Difference]: With dead ends: 32 [2019-09-20 12:58:29,957 INFO L226 Difference]: Without dead ends: 20 [2019-09-20 12:58:29,958 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-20 12:58:29,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-20 12:58:29,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-09-20 12:58:29,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-09-20 12:58:29,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-09-20 12:58:29,963 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2019-09-20 12:58:29,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:29,963 INFO L475 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-09-20 12:58:29,963 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-20 12:58:29,964 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-09-20 12:58:29,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-09-20 12:58:29,964 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:29,965 INFO L407 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:29,965 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:29,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:29,966 INFO L82 PathProgramCache]: Analyzing trace with hash -657196198, now seen corresponding path program 1 times [2019-09-20 12:58:29,966 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:29,966 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:29,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:29,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:29,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:30,010 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-20 12:58:30,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:30,011 INFO L224 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) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:30,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:30,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:30,058 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2019-09-20 12:58:30,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:30,085 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:30,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:30,089 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2019-09-20 12:58:30,090 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-20 12:58:30,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-20 12:58:30,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:30,091 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2019-09-20 12:58:30,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:30,121 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-09-20 12:58:30,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 12:58:30,122 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-09-20 12:58:30,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:30,123 INFO L225 Difference]: With dead ends: 35 [2019-09-20 12:58:30,123 INFO L226 Difference]: Without dead ends: 23 [2019-09-20 12:58:30,123 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-20 12:58:30,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-09-20 12:58:30,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-09-20 12:58:30,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-20 12:58:30,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-09-20 12:58:30,130 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 18 [2019-09-20 12:58:30,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:30,130 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-09-20 12:58:30,130 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-20 12:58:30,131 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-09-20 12:58:30,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-09-20 12:58:30,131 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:30,132 INFO L407 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:30,132 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:30,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:30,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1550672957, now seen corresponding path program 2 times [2019-09-20 12:58:30,133 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:30,133 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:30,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:30,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:30,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:30,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:30,221 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-09-20 12:58:30,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:30,221 INFO L224 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) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:30,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:30,258 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:30,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:30,259 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-20 12:58:30,260 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:30,310 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-20 12:58:30,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:30,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2019-09-20 12:58:30,315 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-20 12:58:30,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-20 12:58:30,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-09-20 12:58:30,317 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2019-09-20 12:58:30,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:30,533 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2019-09-20 12:58:30,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-20 12:58:30,534 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2019-09-20 12:58:30,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:30,535 INFO L225 Difference]: With dead ends: 54 [2019-09-20 12:58:30,535 INFO L226 Difference]: Without dead ends: 42 [2019-09-20 12:58:30,537 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2019-09-20 12:58:30,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-09-20 12:58:30,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2019-09-20 12:58:30,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-09-20 12:58:30,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-09-20 12:58:30,545 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 21 [2019-09-20 12:58:30,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:30,546 INFO L475 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-09-20 12:58:30,546 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-20 12:58:30,546 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-09-20 12:58:30,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-09-20 12:58:30,547 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:30,548 INFO L407 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:30,548 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:30,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:30,548 INFO L82 PathProgramCache]: Analyzing trace with hash -497587749, now seen corresponding path program 3 times [2019-09-20 12:58:30,549 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:30,549 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:30,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:30,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:30,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:30,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:30,679 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-09-20 12:58:30,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:30,679 INFO L224 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) [2019-09-20 12:58:30,699 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:30,722 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-09-20 12:58:30,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:30,724 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 12:58:30,740 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:30,811 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-20 12:58:30,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:30,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2019-09-20 12:58:30,819 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 12:58:30,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 12:58:30,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2019-09-20 12:58:30,821 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 11 states. [2019-09-20 12:58:31,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:31,036 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2019-09-20 12:58:31,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-09-20 12:58:31,037 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-09-20 12:58:31,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:31,043 INFO L225 Difference]: With dead ends: 81 [2019-09-20 12:58:31,044 INFO L226 Difference]: Without dead ends: 76 [2019-09-20 12:58:31,045 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=135, Invalid=245, Unknown=0, NotChecked=0, Total=380 [2019-09-20 12:58:31,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-09-20 12:58:31,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 43. [2019-09-20 12:58:31,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-09-20 12:58:31,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-09-20 12:58:31,066 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-09-20 12:58:31,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:31,072 INFO L475 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-09-20 12:58:31,072 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 12:58:31,072 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-09-20 12:58:31,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-09-20 12:58:31,075 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:31,075 INFO L407 BasicCegarLoop]: trace histogram [11, 10, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:31,076 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:31,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:31,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1927396762, now seen corresponding path program 4 times [2019-09-20 12:58:31,076 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:31,076 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:31,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:31,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:31,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:31,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:31,277 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 81 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:31,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:31,278 INFO L224 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 [2019-09-20 12:58:31,296 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:31,316 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:31,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:31,318 INFO L256 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-20 12:58:31,320 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:31,399 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 80 proven. 15 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-09-20 12:58:31,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:31,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 6] total 20 [2019-09-20 12:58:31,404 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-20 12:58:31,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-20 12:58:31,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2019-09-20 12:58:31,405 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2019-09-20 12:58:31,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:31,555 INFO L93 Difference]: Finished difference Result 77 states and 94 transitions. [2019-09-20 12:58:31,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-20 12:58:31,556 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-09-20 12:58:31,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:31,557 INFO L225 Difference]: With dead ends: 77 [2019-09-20 12:58:31,557 INFO L226 Difference]: Without dead ends: 47 [2019-09-20 12:58:31,560 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2019-09-20 12:58:31,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-20 12:58:31,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-09-20 12:58:31,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-09-20 12:58:31,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2019-09-20 12:58:31,574 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 42 [2019-09-20 12:58:31,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:31,575 INFO L475 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2019-09-20 12:58:31,575 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-20 12:58:31,575 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2019-09-20 12:58:31,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-09-20 12:58:31,578 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:31,578 INFO L407 BasicCegarLoop]: trace histogram [12, 11, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:31,578 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:31,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:31,579 INFO L82 PathProgramCache]: Analyzing trace with hash -778605187, now seen corresponding path program 5 times [2019-09-20 12:58:31,579 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:31,579 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:31,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:31,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:31,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:31,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:31,855 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 84 proven. 114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:31,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:31,856 INFO L224 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 [2019-09-20 12:58:31,877 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-20 12:58:31,909 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-09-20 12:58:31,911 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:31,912 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-20 12:58:31,915 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:32,005 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 102 proven. 26 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-09-20 12:58:32,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:32,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7] total 23 [2019-09-20 12:58:32,010 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-20 12:58:32,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-20 12:58:32,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2019-09-20 12:58:32,011 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2019-09-20 12:58:32,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:32,207 INFO L93 Difference]: Finished difference Result 80 states and 97 transitions. [2019-09-20 12:58:32,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-20 12:58:32,207 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2019-09-20 12:58:32,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:32,209 INFO L225 Difference]: With dead ends: 80 [2019-09-20 12:58:32,209 INFO L226 Difference]: Without dead ends: 50 [2019-09-20 12:58:32,211 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=238, Invalid=754, Unknown=0, NotChecked=0, Total=992 [2019-09-20 12:58:32,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-09-20 12:58:32,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2019-09-20 12:58:32,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-09-20 12:58:32,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2019-09-20 12:58:32,226 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 45 [2019-09-20 12:58:32,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:32,226 INFO L475 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2019-09-20 12:58:32,227 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-20 12:58:32,227 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2019-09-20 12:58:32,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-09-20 12:58:32,229 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:32,230 INFO L407 BasicCegarLoop]: trace histogram [13, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:32,230 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:32,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:32,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1253478074, now seen corresponding path program 6 times [2019-09-20 12:58:32,232 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:32,232 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:32,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:32,234 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:32,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:32,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:32,496 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 87 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:32,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:32,496 INFO L224 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 [2019-09-20 12:58:32,519 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-20 12:58:32,554 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-09-20 12:58:32,555 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:32,555 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-20 12:58:32,559 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:32,660 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 124 proven. 40 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-09-20 12:58:32,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:32,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8] total 26 [2019-09-20 12:58:32,666 INFO L454 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-09-20 12:58:32,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-09-20 12:58:32,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=510, Unknown=0, NotChecked=0, Total=650 [2019-09-20 12:58:32,667 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 26 states. [2019-09-20 12:58:32,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:32,898 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2019-09-20 12:58:32,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-20 12:58:32,904 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 48 [2019-09-20 12:58:32,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:32,906 INFO L225 Difference]: With dead ends: 83 [2019-09-20 12:58:32,906 INFO L226 Difference]: Without dead ends: 53 [2019-09-20 12:58:32,907 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=324, Invalid=1008, Unknown=0, NotChecked=0, Total=1332 [2019-09-20 12:58:32,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-09-20 12:58:32,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-09-20 12:58:32,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-20 12:58:32,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-09-20 12:58:32,916 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 48 [2019-09-20 12:58:32,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:32,916 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-09-20 12:58:32,917 INFO L476 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-09-20 12:58:32,917 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-09-20 12:58:32,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-09-20 12:58:32,920 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:32,920 INFO L407 BasicCegarLoop]: trace histogram [14, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:32,921 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:32,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:32,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1481869405, now seen corresponding path program 7 times [2019-09-20 12:58:32,921 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:32,921 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:32,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:32,923 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:32,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:32,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 90 proven. 183 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:33,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:33,190 INFO L224 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) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:33,224 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:33,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:33,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 8 conjunts are in the unsatisfiable core [2019-09-20 12:58:33,246 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:33,364 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 146 proven. 57 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (8)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:33,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:33,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 29 [2019-09-20 12:58:33,370 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-20 12:58:33,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-20 12:58:33,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=637, Unknown=0, NotChecked=0, Total=812 [2019-09-20 12:58:33,371 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand 29 states. [2019-09-20 12:58:33,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:33,620 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2019-09-20 12:58:33,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-09-20 12:58:33,621 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 51 [2019-09-20 12:58:33,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:33,622 INFO L225 Difference]: With dead ends: 86 [2019-09-20 12:58:33,622 INFO L226 Difference]: Without dead ends: 56 [2019-09-20 12:58:33,623 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=425, Invalid=1297, Unknown=0, NotChecked=0, Total=1722 [2019-09-20 12:58:33,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-09-20 12:58:33,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-09-20 12:58:33,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-09-20 12:58:33,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2019-09-20 12:58:33,630 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 51 [2019-09-20 12:58:33,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:33,631 INFO L475 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2019-09-20 12:58:33,631 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-20 12:58:33,631 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2019-09-20 12:58:33,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-09-20 12:58:33,632 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:33,632 INFO L407 BasicCegarLoop]: trace histogram [15, 14, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:33,632 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:33,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:33,633 INFO L82 PathProgramCache]: Analyzing trace with hash -2035152934, now seen corresponding path program 8 times [2019-09-20 12:58:33,633 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:33,633 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:33,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:33,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:33,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:33,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:33,699 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-09-20 12:58:33,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:33,700 INFO L224 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 [2019-09-20 12:58:33,733 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:33,754 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:33,755 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:33,757 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 9 conjunts are in the unsatisfiable core [2019-09-20 12:58:33,760 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:33,769 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 168 proven. 77 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (9)] Exception during sending of exit command (exit): Broken pipe [2019-09-20 12:58:33,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:33,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2019-09-20 12:58:33,783 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-20 12:58:33,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-20 12:58:33,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-09-20 12:58:33,784 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 10 states. [2019-09-20 12:58:33,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:33,823 INFO L93 Difference]: Finished difference Result 89 states and 106 transitions. [2019-09-20 12:58:33,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-20 12:58:33,824 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 54 [2019-09-20 12:58:33,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:33,825 INFO L225 Difference]: With dead ends: 89 [2019-09-20 12:58:33,825 INFO L226 Difference]: Without dead ends: 59 [2019-09-20 12:58:33,826 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2019-09-20 12:58:33,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-09-20 12:58:33,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-09-20 12:58:33,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-09-20 12:58:33,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2019-09-20 12:58:33,833 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 54 [2019-09-20 12:58:33,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:33,833 INFO L475 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2019-09-20 12:58:33,833 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-20 12:58:33,833 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2019-09-20 12:58:33,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-09-20 12:58:33,834 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:33,835 INFO L407 BasicCegarLoop]: trace histogram [16, 15, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:33,835 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:33,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:33,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1920468163, now seen corresponding path program 9 times [2019-09-20 12:58:33,835 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:33,835 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:33,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:33,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:33,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:33,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:33,949 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-09-20 12:58:33,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:33,950 INFO L224 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) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:33,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 12:58:34,004 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-09-20 12:58:34,004 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:34,005 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-20 12:58:34,009 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:34,133 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 190 proven. 100 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-09-20 12:58:34,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:34,138 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2019-09-20 12:58:34,138 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-20 12:58:34,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-20 12:58:34,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2019-09-20 12:58:34,139 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand 21 states. [2019-09-20 12:58:34,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:34,553 INFO L93 Difference]: Finished difference Result 174 states and 221 transitions. [2019-09-20 12:58:34,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-09-20 12:58:34,553 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 57 [2019-09-20 12:58:34,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:34,554 INFO L225 Difference]: With dead ends: 174 [2019-09-20 12:58:34,555 INFO L226 Difference]: Without dead ends: 144 [2019-09-20 12:58:34,556 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=398, Invalid=1242, Unknown=0, NotChecked=0, Total=1640 [2019-09-20 12:58:34,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-09-20 12:58:34,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 76. [2019-09-20 12:58:34,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-09-20 12:58:34,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2019-09-20 12:58:34,565 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 57 [2019-09-20 12:58:34,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:34,565 INFO L475 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2019-09-20 12:58:34,566 INFO L476 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-09-20 12:58:34,566 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2019-09-20 12:58:34,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-09-20 12:58:34,567 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:34,567 INFO L407 BasicCegarLoop]: trace histogram [18, 17, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:34,567 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:34,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:34,567 INFO L82 PathProgramCache]: Analyzing trace with hash -588505765, now seen corresponding path program 10 times [2019-09-20 12:58:34,568 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:34,568 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:34,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:34,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:34,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:34,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:34,678 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 333 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-09-20 12:58:34,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:34,678 INFO L224 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 [2019-09-20 12:58:34,703 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:34,742 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:34,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:34,743 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 12:58:34,746 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:34,905 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 241 proven. 126 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2019-09-20 12:58:34,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:34,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2019-09-20 12:58:34,909 INFO L454 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-09-20 12:58:34,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-09-20 12:58:34,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2019-09-20 12:58:34,910 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand 23 states. [2019-09-20 12:58:35,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:35,395 INFO L93 Difference]: Finished difference Result 220 states and 282 transitions. [2019-09-20 12:58:35,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-09-20 12:58:35,396 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 63 [2019-09-20 12:58:35,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:35,397 INFO L225 Difference]: With dead ends: 220 [2019-09-20 12:58:35,398 INFO L226 Difference]: Without dead ends: 175 [2019-09-20 12:58:35,399 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=476, Invalid=1504, Unknown=0, NotChecked=0, Total=1980 [2019-09-20 12:58:35,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2019-09-20 12:58:35,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 82. [2019-09-20 12:58:35,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-09-20 12:58:35,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 96 transitions. [2019-09-20 12:58:35,409 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 96 transitions. Word has length 63 [2019-09-20 12:58:35,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:35,409 INFO L475 AbstractCegarLoop]: Abstraction has 82 states and 96 transitions. [2019-09-20 12:58:35,410 INFO L476 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-09-20 12:58:35,410 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 96 transitions. [2019-09-20 12:58:35,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-09-20 12:58:35,411 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:35,411 INFO L407 BasicCegarLoop]: trace histogram [20, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:35,411 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:35,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:35,411 INFO L82 PathProgramCache]: Analyzing trace with hash -346376131, now seen corresponding path program 11 times [2019-09-20 12:58:35,412 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:35,412 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:35,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:35,413 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:35,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:35,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 415 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-09-20 12:58:35,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:35,524 INFO L224 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 [2019-09-20 12:58:35,547 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-20 12:58:35,585 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2019-09-20 12:58:35,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:35,586 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 12 conjunts are in the unsatisfiable core [2019-09-20 12:58:35,589 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:35,715 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 298 proven. 155 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-09-20 12:58:35,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:35,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2019-09-20 12:58:35,719 INFO L454 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-09-20 12:58:35,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-09-20 12:58:35,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2019-09-20 12:58:35,720 INFO L87 Difference]: Start difference. First operand 82 states and 96 transitions. Second operand 25 states. [2019-09-20 12:58:36,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:36,210 INFO L93 Difference]: Finished difference Result 242 states and 311 transitions. [2019-09-20 12:58:36,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-09-20 12:58:36,210 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2019-09-20 12:58:36,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:36,211 INFO L225 Difference]: With dead ends: 242 [2019-09-20 12:58:36,211 INFO L226 Difference]: Without dead ends: 194 [2019-09-20 12:58:36,213 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=1791, Unknown=0, NotChecked=0, Total=2352 [2019-09-20 12:58:36,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2019-09-20 12:58:36,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 88. [2019-09-20 12:58:36,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-09-20 12:58:36,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 103 transitions. [2019-09-20 12:58:36,223 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 103 transitions. Word has length 69 [2019-09-20 12:58:36,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:36,223 INFO L475 AbstractCegarLoop]: Abstraction has 88 states and 103 transitions. [2019-09-20 12:58:36,223 INFO L476 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-09-20 12:58:36,223 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 103 transitions. [2019-09-20 12:58:36,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-09-20 12:58:36,224 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:36,225 INFO L407 BasicCegarLoop]: trace histogram [22, 21, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:36,225 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:36,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:36,225 INFO L82 PathProgramCache]: Analyzing trace with hash 2024448987, now seen corresponding path program 12 times [2019-09-20 12:58:36,225 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:36,226 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:36,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:36,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:36,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:36,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:36,377 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-09-20 12:58:36,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:36,378 INFO L224 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) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:36,401 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-20 12:58:36,446 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2019-09-20 12:58:36,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:36,447 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-20 12:58:36,449 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:36,629 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 361 proven. 187 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2019-09-20 12:58:36,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:36,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 27 [2019-09-20 12:58:36,633 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-20 12:58:36,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-20 12:58:36,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2019-09-20 12:58:36,634 INFO L87 Difference]: Start difference. First operand 88 states and 103 transitions. Second operand 27 states. [2019-09-20 12:58:37,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:37,184 INFO L93 Difference]: Finished difference Result 264 states and 340 transitions. [2019-09-20 12:58:37,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-09-20 12:58:37,184 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 75 [2019-09-20 12:58:37,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:37,186 INFO L225 Difference]: With dead ends: 264 [2019-09-20 12:58:37,186 INFO L226 Difference]: Without dead ends: 213 [2019-09-20 12:58:37,188 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=653, Invalid=2103, Unknown=0, NotChecked=0, Total=2756 [2019-09-20 12:58:37,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2019-09-20 12:58:37,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 94. [2019-09-20 12:58:37,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-09-20 12:58:37,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 110 transitions. [2019-09-20 12:58:37,196 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 110 transitions. Word has length 75 [2019-09-20 12:58:37,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:37,197 INFO L475 AbstractCegarLoop]: Abstraction has 94 states and 110 transitions. [2019-09-20 12:58:37,197 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-20 12:58:37,197 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 110 transitions. [2019-09-20 12:58:37,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-09-20 12:58:37,198 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:37,198 INFO L407 BasicCegarLoop]: trace histogram [24, 23, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:37,198 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:37,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:37,199 INFO L82 PathProgramCache]: Analyzing trace with hash 275670333, now seen corresponding path program 13 times [2019-09-20 12:58:37,199 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:37,199 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:37,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:37,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:37,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:37,439 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 606 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-09-20 12:58:37,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:37,439 INFO L224 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 [2019-09-20 12:58:37,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:37,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:37,524 INFO L256 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 14 conjunts are in the unsatisfiable core [2019-09-20 12:58:37,526 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:37,809 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 430 proven. 222 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2019-09-20 12:58:37,815 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:37,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2019-09-20 12:58:37,817 INFO L454 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-09-20 12:58:37,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-09-20 12:58:37,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=612, Unknown=0, NotChecked=0, Total=812 [2019-09-20 12:58:37,819 INFO L87 Difference]: Start difference. First operand 94 states and 110 transitions. Second operand 29 states. [2019-09-20 12:58:38,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:38,430 INFO L93 Difference]: Finished difference Result 286 states and 369 transitions. [2019-09-20 12:58:38,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-09-20 12:58:38,431 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 81 [2019-09-20 12:58:38,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:38,433 INFO L225 Difference]: With dead ends: 286 [2019-09-20 12:58:38,433 INFO L226 Difference]: Without dead ends: 232 [2019-09-20 12:58:38,435 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=752, Invalid=2440, Unknown=0, NotChecked=0, Total=3192 [2019-09-20 12:58:38,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2019-09-20 12:58:38,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 100. [2019-09-20 12:58:38,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-09-20 12:58:38,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 117 transitions. [2019-09-20 12:58:38,444 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 117 transitions. Word has length 81 [2019-09-20 12:58:38,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:38,444 INFO L475 AbstractCegarLoop]: Abstraction has 100 states and 117 transitions. [2019-09-20 12:58:38,444 INFO L476 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-09-20 12:58:38,444 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 117 transitions. [2019-09-20 12:58:38,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-09-20 12:58:38,445 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:38,445 INFO L407 BasicCegarLoop]: trace histogram [26, 25, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:38,446 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:38,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:38,446 INFO L82 PathProgramCache]: Analyzing trace with hash 910752347, now seen corresponding path program 14 times [2019-09-20 12:58:38,446 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:38,446 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:38,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:38,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:38,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:38,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:38,617 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 715 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-09-20 12:58:38,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:38,618 INFO L224 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 [2019-09-20 12:58:38,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:58:38,683 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:58:38,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:38,684 INFO L256 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-20 12:58:38,686 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:38,877 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 505 proven. 260 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-09-20 12:58:38,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:38,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 31 [2019-09-20 12:58:38,881 INFO L454 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-09-20 12:58:38,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-09-20 12:58:38,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=701, Unknown=0, NotChecked=0, Total=930 [2019-09-20 12:58:38,881 INFO L87 Difference]: Start difference. First operand 100 states and 117 transitions. Second operand 31 states. [2019-09-20 12:58:39,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:39,589 INFO L93 Difference]: Finished difference Result 308 states and 398 transitions. [2019-09-20 12:58:39,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-09-20 12:58:39,590 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2019-09-20 12:58:39,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:39,592 INFO L225 Difference]: With dead ends: 308 [2019-09-20 12:58:39,592 INFO L226 Difference]: Without dead ends: 251 [2019-09-20 12:58:39,594 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=858, Invalid=2802, Unknown=0, NotChecked=0, Total=3660 [2019-09-20 12:58:39,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2019-09-20 12:58:39,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 106. [2019-09-20 12:58:39,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-09-20 12:58:39,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2019-09-20 12:58:39,602 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 87 [2019-09-20 12:58:39,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:39,602 INFO L475 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2019-09-20 12:58:39,603 INFO L476 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-09-20 12:58:39,603 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2019-09-20 12:58:39,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-09-20 12:58:39,604 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:39,604 INFO L407 BasicCegarLoop]: trace histogram [28, 27, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:39,604 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:39,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:39,604 INFO L82 PathProgramCache]: Analyzing trace with hash 96928317, now seen corresponding path program 15 times [2019-09-20 12:58:39,605 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:39,605 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:39,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,606 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:39,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:39,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:39,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 833 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-09-20 12:58:39,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:39,796 INFO L224 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 [2019-09-20 12:58:39,831 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 12:58:39,883 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-09-20 12:58:39,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:39,887 INFO L256 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 30 conjunts are in the unsatisfiable core [2019-09-20 12:58:39,889 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:40,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 561 proven. 534 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (16)] Exception during sending of exit command (exit): Stream closed [2019-09-20 12:58:40,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:40,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2019-09-20 12:58:40,216 INFO L454 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-09-20 12:58:40,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-09-20 12:58:40,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2019-09-20 12:58:40,217 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand 33 states. [2019-09-20 12:58:41,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:41,048 INFO L93 Difference]: Finished difference Result 435 states and 577 transitions. [2019-09-20 12:58:41,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2019-09-20 12:58:41,049 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 93 [2019-09-20 12:58:41,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:41,052 INFO L225 Difference]: With dead ends: 435 [2019-09-20 12:58:41,052 INFO L226 Difference]: Without dead ends: 430 [2019-09-20 12:58:41,054 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1235, Invalid=2797, Unknown=0, NotChecked=0, Total=4032 [2019-09-20 12:58:41,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2019-09-20 12:58:41,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 142. [2019-09-20 12:58:41,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-09-20 12:58:41,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 172 transitions. [2019-09-20 12:58:41,064 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 172 transitions. Word has length 93 [2019-09-20 12:58:41,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:41,064 INFO L475 AbstractCegarLoop]: Abstraction has 142 states and 172 transitions. [2019-09-20 12:58:41,064 INFO L476 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-09-20 12:58:41,065 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 172 transitions. [2019-09-20 12:58:41,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-09-20 12:58:41,066 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:41,066 INFO L407 BasicCegarLoop]: trace histogram [44, 43, 30, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:41,066 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:41,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:41,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1146565437, now seen corresponding path program 16 times [2019-09-20 12:58:41,067 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:41,067 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:41,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:41,069 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:41,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:41,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:42,225 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1291 proven. 1547 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 12:58:42,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:42,226 INFO L224 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 [2019-09-20 12:58:42,260 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 12:58:42,325 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 12:58:42,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:42,327 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 44 conjunts are in the unsatisfiable core [2019-09-20 12:58:42,330 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:44,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 170 proven. 2667 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-20 12:58:44,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:44,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 45] total 103 [2019-09-20 12:58:44,017 INFO L454 AbstractCegarLoop]: Interpolant automaton has 103 states [2019-09-20 12:58:44,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2019-09-20 12:58:44,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1918, Invalid=8588, Unknown=0, NotChecked=0, Total=10506 [2019-09-20 12:58:44,021 INFO L87 Difference]: Start difference. First operand 142 states and 172 transitions. Second operand 103 states. [2019-09-20 12:58:44,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:44,869 INFO L93 Difference]: Finished difference Result 326 states and 415 transitions. [2019-09-20 12:58:44,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-09-20 12:58:44,869 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 141 [2019-09-20 12:58:44,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:44,870 INFO L225 Difference]: With dead ends: 326 [2019-09-20 12:58:44,870 INFO L226 Difference]: Without dead ends: 230 [2019-09-20 12:58:44,875 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4438 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3868, Invalid=13424, Unknown=0, NotChecked=0, Total=17292 [2019-09-20 12:58:44,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2019-09-20 12:58:44,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2019-09-20 12:58:44,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2019-09-20 12:58:44,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 259 transitions. [2019-09-20 12:58:44,887 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 259 transitions. Word has length 141 [2019-09-20 12:58:44,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:44,887 INFO L475 AbstractCegarLoop]: Abstraction has 229 states and 259 transitions. [2019-09-20 12:58:44,887 INFO L476 AbstractCegarLoop]: Interpolant automaton has 103 states. [2019-09-20 12:58:44,887 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 259 transitions. [2019-09-20 12:58:44,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2019-09-20 12:58:44,891 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:44,891 INFO L407 BasicCegarLoop]: trace histogram [73, 72, 43, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:44,892 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:44,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:44,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1877929926, now seen corresponding path program 17 times [2019-09-20 12:58:44,892 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:44,892 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:44,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:44,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:44,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:44,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:45,508 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 0 proven. 5089 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2019-09-20 12:58:45,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:45,509 INFO L224 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) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:58:45,548 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-20 12:58:45,709 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2019-09-20 12:58:45,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:45,712 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 45 conjunts are in the unsatisfiable core [2019-09-20 12:58:45,715 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:47,027 INFO L134 CoverageAnalysis]: Checked inductivity of 7884 backedges. 3842 proven. 2795 refuted. 0 times theorem prover too weak. 1247 trivial. 0 not checked. [2019-09-20 12:58:47,031 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:47,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 46] total 78 [2019-09-20 12:58:47,032 INFO L454 AbstractCegarLoop]: Interpolant automaton has 78 states [2019-09-20 12:58:47,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2019-09-20 12:58:47,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1535, Invalid=4471, Unknown=0, NotChecked=0, Total=6006 [2019-09-20 12:58:47,034 INFO L87 Difference]: Start difference. First operand 229 states and 259 transitions. Second operand 78 states. [2019-09-20 12:58:50,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:50,724 INFO L93 Difference]: Finished difference Result 1115 states and 1448 transitions. [2019-09-20 12:58:50,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2019-09-20 12:58:50,725 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 228 [2019-09-20 12:58:50,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:50,729 INFO L225 Difference]: With dead ends: 1115 [2019-09-20 12:58:50,730 INFO L226 Difference]: Without dead ends: 1019 [2019-09-20 12:58:50,732 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 436 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6257 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6773, Invalid=21283, Unknown=0, NotChecked=0, Total=28056 [2019-09-20 12:58:50,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2019-09-20 12:58:50,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 280. [2019-09-20 12:58:50,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2019-09-20 12:58:50,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 326 transitions. [2019-09-20 12:58:50,758 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 326 transitions. Word has length 228 [2019-09-20 12:58:50,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:50,758 INFO L475 AbstractCegarLoop]: Abstraction has 280 states and 326 transitions. [2019-09-20 12:58:50,758 INFO L476 AbstractCegarLoop]: Interpolant automaton has 78 states. [2019-09-20 12:58:50,758 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 326 transitions. [2019-09-20 12:58:50,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2019-09-20 12:58:50,761 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:50,761 INFO L407 BasicCegarLoop]: trace histogram [75, 74, 44, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:50,761 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:50,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:50,761 INFO L82 PathProgramCache]: Analyzing trace with hash 387565848, now seen corresponding path program 18 times [2019-09-20 12:58:50,762 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:50,762 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:50,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:50,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:50,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:50,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:51,589 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 0 proven. 5399 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2019-09-20 12:58:51,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:51,590 INFO L224 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 [2019-09-20 12:58:51,644 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-20 12:58:51,799 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2019-09-20 12:58:51,799 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:58:51,801 INFO L256 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 46 conjunts are in the unsatisfiable core [2019-09-20 12:58:51,805 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:53,133 INFO L134 CoverageAnalysis]: Checked inductivity of 8325 backedges. 4064 proven. 2926 refuted. 0 times theorem prover too weak. 1335 trivial. 0 not checked. [2019-09-20 12:58:53,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:53,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 47] total 80 [2019-09-20 12:58:53,137 INFO L454 AbstractCegarLoop]: Interpolant automaton has 80 states [2019-09-20 12:58:53,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2019-09-20 12:58:53,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1613, Invalid=4707, Unknown=0, NotChecked=0, Total=6320 [2019-09-20 12:58:53,139 INFO L87 Difference]: Start difference. First operand 280 states and 326 transitions. Second operand 80 states. [2019-09-20 12:58:56,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:58:56,866 INFO L93 Difference]: Finished difference Result 1260 states and 1641 transitions. [2019-09-20 12:58:56,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2019-09-20 12:58:56,867 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 234 [2019-09-20 12:58:56,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:58:56,872 INFO L225 Difference]: With dead ends: 1260 [2019-09-20 12:58:56,873 INFO L226 Difference]: Without dead ends: 1116 [2019-09-20 12:58:56,876 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6557 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7083, Invalid=22329, Unknown=0, NotChecked=0, Total=29412 [2019-09-20 12:58:56,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2019-09-20 12:58:56,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 286. [2019-09-20 12:58:56,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2019-09-20 12:58:56,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 333 transitions. [2019-09-20 12:58:56,907 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 333 transitions. Word has length 234 [2019-09-20 12:58:56,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:58:56,908 INFO L475 AbstractCegarLoop]: Abstraction has 286 states and 333 transitions. [2019-09-20 12:58:56,908 INFO L476 AbstractCegarLoop]: Interpolant automaton has 80 states. [2019-09-20 12:58:56,908 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 333 transitions. [2019-09-20 12:58:56,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2019-09-20 12:58:56,911 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:58:56,911 INFO L407 BasicCegarLoop]: trace histogram [77, 76, 45, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:58:56,912 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:58:56,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:58:56,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1058539962, now seen corresponding path program 19 times [2019-09-20 12:58:56,912 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:58:56,912 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:58:56,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:56,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 12:58:56,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:58:56,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:57,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 0 proven. 5718 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2019-09-20 12:58:57,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:58:57,750 INFO L224 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 [2019-09-20 12:58:57,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:58:57,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:58:57,887 INFO L256 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 47 conjunts are in the unsatisfiable core [2019-09-20 12:58:57,891 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:58:59,278 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 4292 proven. 3060 refuted. 0 times theorem prover too weak. 1426 trivial. 0 not checked. [2019-09-20 12:58:59,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:58:59,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 48] total 82 [2019-09-20 12:58:59,282 INFO L454 AbstractCegarLoop]: Interpolant automaton has 82 states [2019-09-20 12:58:59,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2019-09-20 12:58:59,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1693, Invalid=4949, Unknown=0, NotChecked=0, Total=6642 [2019-09-20 12:58:59,283 INFO L87 Difference]: Start difference. First operand 286 states and 333 transitions. Second operand 82 states. [2019-09-20 12:59:03,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 12:59:03,248 INFO L93 Difference]: Finished difference Result 1315 states and 1714 transitions. [2019-09-20 12:59:03,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2019-09-20 12:59:03,248 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 240 [2019-09-20 12:59:03,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 12:59:03,253 INFO L225 Difference]: With dead ends: 1315 [2019-09-20 12:59:03,254 INFO L226 Difference]: Without dead ends: 1168 [2019-09-20 12:59:03,258 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6864 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7400, Invalid=23400, Unknown=0, NotChecked=0, Total=30800 [2019-09-20 12:59:03,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2019-09-20 12:59:03,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 292. [2019-09-20 12:59:03,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2019-09-20 12:59:03,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 340 transitions. [2019-09-20 12:59:03,289 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 340 transitions. Word has length 240 [2019-09-20 12:59:03,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 12:59:03,290 INFO L475 AbstractCegarLoop]: Abstraction has 292 states and 340 transitions. [2019-09-20 12:59:03,290 INFO L476 AbstractCegarLoop]: Interpolant automaton has 82 states. [2019-09-20 12:59:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 340 transitions. [2019-09-20 12:59:03,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2019-09-20 12:59:03,293 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 12:59:03,293 INFO L407 BasicCegarLoop]: trace histogram [79, 78, 46, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 12:59:03,293 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 12:59:03,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 12:59:03,294 INFO L82 PathProgramCache]: Analyzing trace with hash -2101031912, now seen corresponding path program 20 times [2019-09-20 12:59:03,294 INFO L224 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-20 12:59:03,294 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-20 12:59:03,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:59:03,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 12:59:03,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 12:59:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 12:59:03,960 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 0 proven. 6046 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2019-09-20 12:59:03,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 12:59:03,960 INFO L224 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) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 12:59:04,024 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-20 12:59:04,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-20 12:59:04,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 12:59:04,108 INFO L256 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 48 conjunts are in the unsatisfiable core [2019-09-20 12:59:04,110 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 12:59:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 9243 backedges. 4526 proven. 3197 refuted. 0 times theorem prover too weak. 1520 trivial. 0 not checked. [2019-09-20 12:59:05,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-20 12:59:05,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 49] total 84 [2019-09-20 12:59:05,578 INFO L454 AbstractCegarLoop]: Interpolant automaton has 84 states [2019-09-20 12:59:05,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2019-09-20 12:59:05,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=5197, Unknown=0, NotChecked=0, Total=6972 [2019-09-20 12:59:05,579 INFO L87 Difference]: Start difference. First operand 292 states and 340 transitions. Second operand 84 states.