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/array-examples/sorting_selectionsort_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:43:36,486 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:43:36,491 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:43:36,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:43:36,509 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:43:36,511 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:43:36,513 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:43:36,523 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:43:36,527 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:43:36,530 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:43:36,532 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:43:36,534 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:43:36,534 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:43:36,536 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:43:36,539 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:43:36,540 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:43:36,541 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:43:36,542 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:43:36,544 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:43:36,548 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:43:36,552 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:43:36,555 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:43:36,558 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:43:36,559 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:43:36,561 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 17:43:36,567 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:43:36,569 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:43:36,570 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:43:36,571 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:43:36,572 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:43:36,572 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:43:36,573 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:43:36,573 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:43:36,573 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:43:36,574 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:43:36,575 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:43:36,576 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 [2019-10-13 17:43:36,599 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:43:36,599 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:43:36,601 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:43:36,603 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:43:36,603 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:43:36,604 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:43:36,604 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:43:36,604 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:43:36,604 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:43:36,605 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:43:36,605 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:43:36,605 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:43:36,605 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:43:36,605 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:43:36,606 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:43:36,606 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:43:36,606 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:43:36,607 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:43:36,607 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:43:36,607 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:43:36,607 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:43:36,608 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:43:36,608 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:43:36,608 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:43:36,608 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:43:36,608 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:43:36,609 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:43:36,609 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:43:36,609 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:43:36,895 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:43:36,908 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:43:36,911 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:43:36,913 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:43:36,913 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:43:36,914 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_selectionsort_ground-2.i [2019-10-13 17:43:36,997 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96a193b59/85f3eb616be043199c178afe4d2530b7/FLAG7609da8b5 [2019-10-13 17:43:37,489 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:43:37,490 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_selectionsort_ground-2.i [2019-10-13 17:43:37,498 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96a193b59/85f3eb616be043199c178afe4d2530b7/FLAG7609da8b5 [2019-10-13 17:43:37,849 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/96a193b59/85f3eb616be043199c178afe4d2530b7 [2019-10-13 17:43:37,860 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:43:37,862 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:43:37,863 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:37,864 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:43:37,867 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:43:37,869 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:37" (1/1) ... [2019-10-13 17:43:37,872 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62c03921 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:37, skipping insertion in model container [2019-10-13 17:43:37,872 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:37" (1/1) ... [2019-10-13 17:43:37,880 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:43:37,899 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:43:38,097 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:38,101 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:43:38,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:38,239 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:43:38,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38 WrapperNode [2019-10-13 17:43:38,240 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:38,241 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:43:38,241 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:43:38,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:43:38,252 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,252 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,258 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,259 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,268 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,275 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,277 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (1/1) ... [2019-10-13 17:43:38,279 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:43:38,280 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:43:38,280 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:43:38,280 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:43:38,281 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (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 [2019-10-13 17:43:38,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:43:38,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:43:38,334 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:43:38,334 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:43:38,335 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:43:38,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:43:38,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:43:38,336 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:43:38,336 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:43:38,336 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:43:38,337 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:43:38,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:43:38,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:43:38,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:43:38,694 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:43:38,695 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-10-13 17:43:38,696 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:38 BoogieIcfgContainer [2019-10-13 17:43:38,696 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:43:38,697 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:43:38,697 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:43:38,700 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:43:38,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:43:37" (1/3) ... [2019-10-13 17:43:38,701 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fa029d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:38, skipping insertion in model container [2019-10-13 17:43:38,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:38" (2/3) ... [2019-10-13 17:43:38,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fa029d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:38, skipping insertion in model container [2019-10-13 17:43:38,702 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:38" (3/3) ... [2019-10-13 17:43:38,704 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-2.i [2019-10-13 17:43:38,713 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:43:38,720 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:43:38,731 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:43:38,757 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:43:38,758 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:43:38,758 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:43:38,758 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:43:38,758 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:43:38,758 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:43:38,759 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:43:38,759 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:43:38,778 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states. [2019-10-13 17:43:38,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:43:38,785 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:38,786 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:38,787 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:38,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:38,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1156372912, now seen corresponding path program 1 times [2019-10-13 17:43:38,799 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:38,799 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620266693] [2019-10-13 17:43:38,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,800 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:38,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:38,975 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620266693] [2019-10-13 17:43:38,976 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:38,977 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:43:38,978 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690071516] [2019-10-13 17:43:38,982 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:43:38,982 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:38,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:43:38,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:38,995 INFO L87 Difference]: Start difference. First operand 45 states. Second operand 3 states. [2019-10-13 17:43:39,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:39,148 INFO L93 Difference]: Finished difference Result 82 states and 123 transitions. [2019-10-13 17:43:39,149 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:43:39,150 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-13 17:43:39,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:39,159 INFO L225 Difference]: With dead ends: 82 [2019-10-13 17:43:39,159 INFO L226 Difference]: Without dead ends: 40 [2019-10-13 17:43:39,163 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:39,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-13 17:43:39,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-10-13 17:43:39,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-13 17:43:39,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2019-10-13 17:43:39,211 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 16 [2019-10-13 17:43:39,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:39,212 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2019-10-13 17:43:39,212 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:43:39,212 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2019-10-13 17:43:39,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:43:39,213 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:39,214 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:39,214 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:39,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:39,215 INFO L82 PathProgramCache]: Analyzing trace with hash -2078459264, now seen corresponding path program 1 times [2019-10-13 17:43:39,215 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:39,215 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682091301] [2019-10-13 17:43:39,216 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,216 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:39,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:39,293 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682091301] [2019-10-13 17:43:39,293 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:39,293 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:39,294 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591137625] [2019-10-13 17:43:39,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:39,296 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:39,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:39,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:39,297 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand 4 states. [2019-10-13 17:43:39,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:39,424 INFO L93 Difference]: Finished difference Result 74 states and 96 transitions. [2019-10-13 17:43:39,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:39,425 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-13 17:43:39,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:39,426 INFO L225 Difference]: With dead ends: 74 [2019-10-13 17:43:39,426 INFO L226 Difference]: Without dead ends: 42 [2019-10-13 17:43:39,428 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:39,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-13 17:43:39,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2019-10-13 17:43:39,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-10-13 17:43:39,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 52 transitions. [2019-10-13 17:43:39,448 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 52 transitions. Word has length 16 [2019-10-13 17:43:39,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:39,449 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 52 transitions. [2019-10-13 17:43:39,449 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:39,449 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 52 transitions. [2019-10-13 17:43:39,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-13 17:43:39,452 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:39,452 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:39,453 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:39,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:39,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1609541534, now seen corresponding path program 1 times [2019-10-13 17:43:39,454 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:39,454 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234366828] [2019-10-13 17:43:39,454 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,455 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,455 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:39,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:39,566 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234366828] [2019-10-13 17:43:39,566 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:39,566 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:39,567 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070430830] [2019-10-13 17:43:39,571 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:39,572 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:39,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:39,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:39,573 INFO L87 Difference]: Start difference. First operand 41 states and 52 transitions. Second operand 4 states. [2019-10-13 17:43:39,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:39,779 INFO L93 Difference]: Finished difference Result 72 states and 93 transitions. [2019-10-13 17:43:39,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:39,781 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-13 17:43:39,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:39,794 INFO L225 Difference]: With dead ends: 72 [2019-10-13 17:43:39,795 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:43:39,795 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:39,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:43:39,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 42. [2019-10-13 17:43:39,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-13 17:43:39,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2019-10-13 17:43:39,810 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 18 [2019-10-13 17:43:39,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:39,811 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2019-10-13 17:43:39,811 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:39,811 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2019-10-13 17:43:39,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:43:39,812 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:39,812 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:39,815 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:39,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:39,816 INFO L82 PathProgramCache]: Analyzing trace with hash -898844059, now seen corresponding path program 1 times [2019-10-13 17:43:39,816 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:39,816 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484682649] [2019-10-13 17:43:39,816 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,816 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,817 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:39,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:39,882 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484682649] [2019-10-13 17:43:39,882 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:39,882 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:39,882 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956276506] [2019-10-13 17:43:39,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:39,883 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:39,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:39,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:39,884 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand 4 states. [2019-10-13 17:43:40,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,005 INFO L93 Difference]: Finished difference Result 90 states and 119 transitions. [2019-10-13 17:43:40,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:40,006 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-13 17:43:40,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,007 INFO L225 Difference]: With dead ends: 90 [2019-10-13 17:43:40,007 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:43:40,008 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:40,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:43:40,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 46. [2019-10-13 17:43:40,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-13 17:43:40,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 59 transitions. [2019-10-13 17:43:40,016 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 59 transitions. Word has length 20 [2019-10-13 17:43:40,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,017 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 59 transitions. [2019-10-13 17:43:40,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:40,017 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 59 transitions. [2019-10-13 17:43:40,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:43:40,018 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,018 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,018 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,019 INFO L82 PathProgramCache]: Analyzing trace with hash -1708190685, now seen corresponding path program 1 times [2019-10-13 17:43:40,019 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,019 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303780893] [2019-10-13 17:43:40,020 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,020 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,020 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:40,072 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303780893] [2019-10-13 17:43:40,073 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020087120] [2019-10-13 17:43:40,073 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,126 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:40,132 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:40,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:40,170 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:40,171 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:43:40,171 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665026234] [2019-10-13 17:43:40,172 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:43:40,172 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:43:40,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:40,173 INFO L87 Difference]: Start difference. First operand 46 states and 59 transitions. Second operand 6 states. [2019-10-13 17:43:40,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,297 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2019-10-13 17:43:40,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:43:40,298 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-10-13 17:43:40,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,299 INFO L225 Difference]: With dead ends: 86 [2019-10-13 17:43:40,299 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:43:40,301 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:40,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:43:40,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2019-10-13 17:43:40,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-10-13 17:43:40,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2019-10-13 17:43:40,317 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 20 [2019-10-13 17:43:40,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,317 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2019-10-13 17:43:40,318 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:43:40,318 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2019-10-13 17:43:40,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-13 17:43:40,321 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,322 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,522 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,523 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,523 INFO L82 PathProgramCache]: Analyzing trace with hash 700215557, now seen corresponding path program 2 times [2019-10-13 17:43:40,523 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,524 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031129102] [2019-10-13 17:43:40,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,524 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,524 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,608 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:40,608 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031129102] [2019-10-13 17:43:40,609 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259475463] [2019-10-13 17:43:40,609 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-10-13 17:43:40,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:40,660 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:40,662 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:40,679 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 17:43:40,680 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-13 17:43:40,680 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2019-10-13 17:43:40,680 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593430260] [2019-10-13 17:43:40,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:40,681 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:40,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:40,682 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand 4 states. [2019-10-13 17:43:40,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,765 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2019-10-13 17:43:40,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:40,768 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2019-10-13 17:43:40,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,769 INFO L225 Difference]: With dead ends: 108 [2019-10-13 17:43:40,770 INFO L226 Difference]: Without dead ends: 73 [2019-10-13 17:43:40,771 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:40,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-13 17:43:40,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 49. [2019-10-13 17:43:40,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-10-13 17:43:40,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2019-10-13 17:43:40,785 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 22 [2019-10-13 17:43:40,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,786 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2019-10-13 17:43:40,786 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:40,786 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2019-10-13 17:43:40,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-13 17:43:40,789 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,789 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,995 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,996 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,996 INFO L82 PathProgramCache]: Analyzing trace with hash -159559916, now seen corresponding path program 1 times [2019-10-13 17:43:40,996 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,997 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155957650] [2019-10-13 17:43:40,997 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,997 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,114 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155957650] [2019-10-13 17:43:41,115 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981769192] [2019-10-13 17:43:41,115 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,163 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,169 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,192 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:41,193 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:43:41,193 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246565786] [2019-10-13 17:43:41,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:43:41,194 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:43:41,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:41,197 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 7 states. [2019-10-13 17:43:41,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,329 INFO L93 Difference]: Finished difference Result 90 states and 116 transitions. [2019-10-13 17:43:41,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:43:41,330 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-10-13 17:43:41,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,331 INFO L225 Difference]: With dead ends: 90 [2019-10-13 17:43:41,332 INFO L226 Difference]: Without dead ends: 52 [2019-10-13 17:43:41,335 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:41,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-13 17:43:41,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2019-10-13 17:43:41,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-10-13 17:43:41,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2019-10-13 17:43:41,347 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 25 [2019-10-13 17:43:41,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,348 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2019-10-13 17:43:41,349 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:43:41,349 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2019-10-13 17:43:41,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:43:41,350 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,350 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,557 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,559 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1768902798, now seen corresponding path program 2 times [2019-10-13 17:43:41,560 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,561 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909182860] [2019-10-13 17:43:41,561 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,561 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,561 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:41,647 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909182860] [2019-10-13 17:43:41,648 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941182170] [2019-10-13 17:43:41,648 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-10-13 17:43:41,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:41,692 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,695 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,720 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-13 17:43:41,721 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-13 17:43:41,721 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2019-10-13 17:43:41,721 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112989241] [2019-10-13 17:43:41,721 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:41,721 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:41,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:41,722 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand 4 states. [2019-10-13 17:43:41,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,776 INFO L93 Difference]: Finished difference Result 102 states and 135 transitions. [2019-10-13 17:43:41,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:41,777 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-10-13 17:43:41,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,778 INFO L225 Difference]: With dead ends: 102 [2019-10-13 17:43:41,778 INFO L226 Difference]: Without dead ends: 67 [2019-10-13 17:43:41,779 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:41,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-13 17:43:41,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2019-10-13 17:43:41,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-13 17:43:41,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 79 transitions. [2019-10-13 17:43:41,785 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 79 transitions. Word has length 27 [2019-10-13 17:43:41,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,786 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 79 transitions. [2019-10-13 17:43:41,786 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:41,786 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 79 transitions. [2019-10-13 17:43:41,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-13 17:43:41,787 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,787 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,999 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,000 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:42,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:42,000 INFO L82 PathProgramCache]: Analyzing trace with hash -485006498, now seen corresponding path program 1 times [2019-10-13 17:43:42,000 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:42,000 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677416336] [2019-10-13 17:43:42,001 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,001 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,001 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:42,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,082 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:42,083 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677416336] [2019-10-13 17:43:42,083 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099120200] [2019-10-13 17:43:42,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,126 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:43:42,128 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:42,144 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:42,144 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:42,144 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:43:42,144 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405531817] [2019-10-13 17:43:42,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:43:42,145 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:42,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:43:42,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:42,146 INFO L87 Difference]: Start difference. First operand 61 states and 79 transitions. Second operand 8 states. [2019-10-13 17:43:42,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,240 INFO L93 Difference]: Finished difference Result 112 states and 148 transitions. [2019-10-13 17:43:42,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:43:42,241 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2019-10-13 17:43:42,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,241 INFO L225 Difference]: With dead ends: 112 [2019-10-13 17:43:42,241 INFO L226 Difference]: Without dead ends: 64 [2019-10-13 17:43:42,242 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:43:42,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-13 17:43:42,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-10-13 17:43:42,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-10-13 17:43:42,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2019-10-13 17:43:42,248 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 28 [2019-10-13 17:43:42,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,248 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2019-10-13 17:43:42,248 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:43:42,248 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2019-10-13 17:43:42,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-13 17:43:42,249 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,249 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:42,453 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,454 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:42,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:42,455 INFO L82 PathProgramCache]: Analyzing trace with hash 301121088, now seen corresponding path program 2 times [2019-10-13 17:43:42,455 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:42,456 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630684389] [2019-10-13 17:43:42,456 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,456 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:42,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,523 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:42,524 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630684389] [2019-10-13 17:43:42,524 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646627290] [2019-10-13 17:43:42,524 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-10-13 17:43:42,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:42,561 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:43:42,564 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:42,648 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:43:42,649 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 59 [2019-10-13 17:43:42,650 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:43:42,658 INFO L567 ElimStorePlain]: treesize reduction 25, result has 30.6 percent of original size [2019-10-13 17:43:42,659 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:43:42,660 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:1 [2019-10-13 17:43:42,679 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 7 [2019-10-13 17:43:42,679 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-13 17:43:42,682 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-13 17:43:42,682 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-13 17:43:42,682 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:23, output treesize:3 [2019-10-13 17:43:42,694 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-13 17:43:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-13 17:43:42,718 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-13 17:43:42,719 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2019-10-13 17:43:42,719 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928515485] [2019-10-13 17:43:42,719 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:43:42,720 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:42,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:43:42,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:43:42,720 INFO L87 Difference]: Start difference. First operand 63 states and 81 transitions. Second operand 6 states. [2019-10-13 17:43:42,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,808 INFO L93 Difference]: Finished difference Result 74 states and 93 transitions. [2019-10-13 17:43:42,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:43:42,809 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2019-10-13 17:43:42,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,810 INFO L225 Difference]: With dead ends: 74 [2019-10-13 17:43:42,810 INFO L226 Difference]: Without dead ends: 72 [2019-10-13 17:43:42,811 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:42,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-13 17:43:42,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2019-10-13 17:43:42,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-10-13 17:43:42,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 88 transitions. [2019-10-13 17:43:42,817 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 88 transitions. Word has length 30 [2019-10-13 17:43:42,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,818 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 88 transitions. [2019-10-13 17:43:42,818 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:43:42,818 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 88 transitions. [2019-10-13 17:43:42,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-13 17:43:42,819 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,819 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,022 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,024 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1931635784, now seen corresponding path program 1 times [2019-10-13 17:43:43,025 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,025 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763951619] [2019-10-13 17:43:43,026 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,026 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,026 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,085 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-10-13 17:43:43,086 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763951619] [2019-10-13 17:43:43,086 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:43,086 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-13 17:43:43,086 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552988336] [2019-10-13 17:43:43,087 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 17:43:43,087 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:43,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 17:43:43,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-13 17:43:43,088 INFO L87 Difference]: Start difference. First operand 69 states and 88 transitions. Second operand 5 states. [2019-10-13 17:43:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:43,247 INFO L93 Difference]: Finished difference Result 133 states and 174 transitions. [2019-10-13 17:43:43,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:43:43,248 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2019-10-13 17:43:43,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:43,251 INFO L225 Difference]: With dead ends: 133 [2019-10-13 17:43:43,251 INFO L226 Difference]: Without dead ends: 92 [2019-10-13 17:43:43,252 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:43,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-13 17:43:43,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 71. [2019-10-13 17:43:43,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-10-13 17:43:43,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 90 transitions. [2019-10-13 17:43:43,268 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 90 transitions. Word has length 35 [2019-10-13 17:43:43,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:43,269 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 90 transitions. [2019-10-13 17:43:43,269 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 17:43:43,269 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 90 transitions. [2019-10-13 17:43:43,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-10-13 17:43:43,270 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:43,270 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,270 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,271 INFO L82 PathProgramCache]: Analyzing trace with hash 210042451, now seen corresponding path program 1 times [2019-10-13 17:43:43,271 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,271 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073577076] [2019-10-13 17:43:43,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,271 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,333 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-13 17:43:43,333 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073577076] [2019-10-13 17:43:43,334 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878459030] [2019-10-13 17:43:43,334 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,390 INFO L256 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:43:43,392 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:43,439 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-13 17:43:43,440 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:43,440 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 11 [2019-10-13 17:43:43,440 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698921972] [2019-10-13 17:43:43,441 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:43:43,441 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:43,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:43:43,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:43:43,442 INFO L87 Difference]: Start difference. First operand 71 states and 90 transitions. Second operand 11 states. [2019-10-13 17:43:43,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:43,652 INFO L93 Difference]: Finished difference Result 145 states and 191 transitions. [2019-10-13 17:43:43,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:43:43,652 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 38 [2019-10-13 17:43:43,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:43,654 INFO L225 Difference]: With dead ends: 145 [2019-10-13 17:43:43,654 INFO L226 Difference]: Without dead ends: 89 [2019-10-13 17:43:43,654 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:43:43,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-13 17:43:43,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 78. [2019-10-13 17:43:43,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-13 17:43:43,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 98 transitions. [2019-10-13 17:43:43,661 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 98 transitions. Word has length 38 [2019-10-13 17:43:43,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:43,662 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 98 transitions. [2019-10-13 17:43:43,662 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:43:43,662 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 98 transitions. [2019-10-13 17:43:43,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-13 17:43:43,663 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:43,663 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,870 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,871 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,872 INFO L82 PathProgramCache]: Analyzing trace with hash 250442742, now seen corresponding path program 2 times [2019-10-13 17:43:43,872 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,872 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051837562] [2019-10-13 17:43:43,872 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,873 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,873 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,956 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-10-13 17:43:43,956 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051837562] [2019-10-13 17:43:43,956 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351014272] [2019-10-13 17:43:43,957 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,019 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:44,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:44,021 INFO L256 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:43:44,023 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:44,090 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:43:44,090 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:44,092 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2019-10-13 17:43:44,092 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303638023] [2019-10-13 17:43:44,093 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:43:44,093 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:44,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:43:44,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:44,094 INFO L87 Difference]: Start difference. First operand 78 states and 98 transitions. Second operand 14 states. [2019-10-13 17:43:44,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:44,660 INFO L93 Difference]: Finished difference Result 286 states and 395 transitions. [2019-10-13 17:43:44,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-13 17:43:44,660 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2019-10-13 17:43:44,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:44,662 INFO L225 Difference]: With dead ends: 286 [2019-10-13 17:43:44,662 INFO L226 Difference]: Without dead ends: 221 [2019-10-13 17:43:44,663 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:43:44,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2019-10-13 17:43:44,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 123. [2019-10-13 17:43:44,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-10-13 17:43:44,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 166 transitions. [2019-10-13 17:43:44,675 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 166 transitions. Word has length 43 [2019-10-13 17:43:44,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:44,675 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 166 transitions. [2019-10-13 17:43:44,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:43:44,675 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 166 transitions. [2019-10-13 17:43:44,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-13 17:43:44,676 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:44,676 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:44,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,887 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:44,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:44,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1573963401, now seen corresponding path program 3 times [2019-10-13 17:43:44,888 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:44,888 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436057759] [2019-10-13 17:43:44,888 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,889 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,889 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:44,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,977 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-10-13 17:43:44,977 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436057759] [2019-10-13 17:43:44,977 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165657623] [2019-10-13 17:43:44,977 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,025 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-13 17:43:45,026 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:45,026 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:43:45,030 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:45,085 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-13 17:43:45,086 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:45,086 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2019-10-13 17:43:45,086 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318882075] [2019-10-13 17:43:45,087 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:43:45,087 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:45,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:43:45,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:45,088 INFO L87 Difference]: Start difference. First operand 123 states and 166 transitions. Second operand 14 states. [2019-10-13 17:43:45,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:45,819 INFO L93 Difference]: Finished difference Result 407 states and 579 transitions. [2019-10-13 17:43:45,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-13 17:43:45,820 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2019-10-13 17:43:45,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:45,823 INFO L225 Difference]: With dead ends: 407 [2019-10-13 17:43:45,823 INFO L226 Difference]: Without dead ends: 323 [2019-10-13 17:43:45,824 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=146, Invalid=504, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:43:45,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2019-10-13 17:43:45,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 135. [2019-10-13 17:43:45,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-13 17:43:45,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 184 transitions. [2019-10-13 17:43:45,840 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 184 transitions. Word has length 48 [2019-10-13 17:43:45,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:45,840 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 184 transitions. [2019-10-13 17:43:45,841 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:43:45,841 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 184 transitions. [2019-10-13 17:43:45,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-13 17:43:45,842 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:45,842 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:46,042 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:46,043 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:46,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1345507828, now seen corresponding path program 4 times [2019-10-13 17:43:46,044 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:46,044 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657328668] [2019-10-13 17:43:46,045 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:46,045 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:46,045 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:46,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,153 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-10-13 17:43:46,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657328668] [2019-10-13 17:43:46,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967869303] [2019-10-13 17:43:46,153 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:46,205 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:46,206 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:46,206 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:43:46,215 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:46,312 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-13 17:43:46,312 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:46,313 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2019-10-13 17:43:46,313 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860210628] [2019-10-13 17:43:46,316 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:43:46,316 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:46,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:43:46,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:43:46,316 INFO L87 Difference]: Start difference. First operand 135 states and 184 transitions. Second operand 17 states. [2019-10-13 17:43:47,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:47,036 INFO L93 Difference]: Finished difference Result 501 states and 714 transitions. [2019-10-13 17:43:47,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-13 17:43:47,037 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 51 [2019-10-13 17:43:47,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:47,040 INFO L225 Difference]: With dead ends: 501 [2019-10-13 17:43:47,040 INFO L226 Difference]: Without dead ends: 381 [2019-10-13 17:43:47,041 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=163, Invalid=539, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:47,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2019-10-13 17:43:47,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 149. [2019-10-13 17:43:47,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-10-13 17:43:47,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 204 transitions. [2019-10-13 17:43:47,059 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 204 transitions. Word has length 51 [2019-10-13 17:43:47,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:47,059 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 204 transitions. [2019-10-13 17:43:47,059 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:43:47,059 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 204 transitions. [2019-10-13 17:43:47,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-13 17:43:47,060 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:47,060 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:47,264 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,264 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:47,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:47,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1590644551, now seen corresponding path program 5 times [2019-10-13 17:43:47,265 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:47,266 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420162079] [2019-10-13 17:43:47,266 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,266 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:47,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,374 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 2 proven. 35 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-10-13 17:43:47,374 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420162079] [2019-10-13 17:43:47,374 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697374483] [2019-10-13 17:43:47,374 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,458 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2019-10-13 17:43:47,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:47,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:43:47,465 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:47,525 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2019-10-13 17:43:47,525 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:47,525 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2019-10-13 17:43:47,526 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330667108] [2019-10-13 17:43:47,526 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:43:47,526 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:47,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:43:47,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:47,527 INFO L87 Difference]: Start difference. First operand 149 states and 204 transitions. Second operand 18 states. [2019-10-13 17:43:47,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:47,865 INFO L93 Difference]: Finished difference Result 296 states and 415 transitions. [2019-10-13 17:43:47,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:43:47,865 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2019-10-13 17:43:47,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:47,867 INFO L225 Difference]: With dead ends: 296 [2019-10-13 17:43:47,867 INFO L226 Difference]: Without dead ends: 168 [2019-10-13 17:43:47,868 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=170, Invalid=480, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:43:47,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2019-10-13 17:43:47,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 157. [2019-10-13 17:43:47,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-10-13 17:43:47,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 214 transitions. [2019-10-13 17:43:47,881 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 214 transitions. Word has length 56 [2019-10-13 17:43:47,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:47,881 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 214 transitions. [2019-10-13 17:43:47,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:43:47,882 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 214 transitions. [2019-10-13 17:43:47,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-13 17:43:47,883 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:47,883 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:48,088 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:48,088 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:48,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:48,089 INFO L82 PathProgramCache]: Analyzing trace with hash -2103851952, now seen corresponding path program 6 times [2019-10-13 17:43:48,089 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:48,090 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928960267] [2019-10-13 17:43:48,090 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,090 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,090 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,242 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 2 proven. 51 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:43:48,242 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928960267] [2019-10-13 17:43:48,242 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57184527] [2019-10-13 17:43:48,243 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:48,327 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-10-13 17:43:48,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:48,328 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:43:48,331 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:48,420 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 15 proven. 51 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2019-10-13 17:43:48,421 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:48,421 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 21 [2019-10-13 17:43:48,421 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633264934] [2019-10-13 17:43:48,422 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:43:48,422 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:48,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:43:48,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=295, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:43:48,423 INFO L87 Difference]: Start difference. First operand 157 states and 214 transitions. Second operand 21 states. [2019-10-13 17:43:48,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:48,725 INFO L93 Difference]: Finished difference Result 269 states and 378 transitions. [2019-10-13 17:43:48,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:43:48,725 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2019-10-13 17:43:48,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:48,727 INFO L225 Difference]: With dead ends: 269 [2019-10-13 17:43:48,727 INFO L226 Difference]: Without dead ends: 173 [2019-10-13 17:43:48,728 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=256, Invalid=614, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:43:48,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2019-10-13 17:43:48,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 163. [2019-10-13 17:43:48,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-10-13 17:43:48,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 222 transitions. [2019-10-13 17:43:48,739 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 222 transitions. Word has length 61 [2019-10-13 17:43:48,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:48,740 INFO L462 AbstractCegarLoop]: Abstraction has 163 states and 222 transitions. [2019-10-13 17:43:48,740 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:43:48,740 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 222 transitions. [2019-10-13 17:43:48,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-10-13 17:43:48,741 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:48,741 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:48,944 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:48,945 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:48,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:48,945 INFO L82 PathProgramCache]: Analyzing trace with hash -559502213, now seen corresponding path program 7 times [2019-10-13 17:43:48,945 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:48,946 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523204040] [2019-10-13 17:43:48,946 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,946 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,946 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:48,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,069 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 2 proven. 70 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-13 17:43:49,069 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523204040] [2019-10-13 17:43:49,069 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917006449] [2019-10-13 17:43:49,069 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:49,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,145 INFO L256 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:43:49,147 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:49,304 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2019-10-13 17:43:49,304 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:49,304 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2019-10-13 17:43:49,305 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678914390] [2019-10-13 17:43:49,305 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-13 17:43:49,305 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:49,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-13 17:43:49,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2019-10-13 17:43:49,306 INFO L87 Difference]: Start difference. First operand 163 states and 222 transitions. Second operand 22 states. [2019-10-13 17:43:50,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:50,495 INFO L93 Difference]: Finished difference Result 760 states and 1094 transitions. [2019-10-13 17:43:50,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-13 17:43:50,495 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 64 [2019-10-13 17:43:50,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:50,503 INFO L225 Difference]: With dead ends: 760 [2019-10-13 17:43:50,503 INFO L226 Difference]: Without dead ends: 616 [2019-10-13 17:43:50,504 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=326, Invalid=1080, Unknown=0, NotChecked=0, Total=1406 [2019-10-13 17:43:50,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2019-10-13 17:43:50,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 189. [2019-10-13 17:43:50,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2019-10-13 17:43:50,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 262 transitions. [2019-10-13 17:43:50,547 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 262 transitions. Word has length 64 [2019-10-13 17:43:50,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:50,548 INFO L462 AbstractCegarLoop]: Abstraction has 189 states and 262 transitions. [2019-10-13 17:43:50,548 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-13 17:43:50,548 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 262 transitions. [2019-10-13 17:43:50,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-13 17:43:50,549 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:50,549 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:50,753 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:50,753 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:50,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:50,754 INFO L82 PathProgramCache]: Analyzing trace with hash 1887853390, now seen corresponding path program 8 times [2019-10-13 17:43:50,754 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:50,754 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367859670] [2019-10-13 17:43:50,755 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:50,755 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:50,755 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:50,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:50,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:50,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:50,948 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 2 proven. 92 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2019-10-13 17:43:50,948 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367859670] [2019-10-13 17:43:50,948 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672303513] [2019-10-13 17:43:50,948 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:51,010 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:51,011 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:51,011 INFO L256 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:43:51,012 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:51,086 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2019-10-13 17:43:51,086 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:51,087 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2019-10-13 17:43:51,087 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976204039] [2019-10-13 17:43:51,087 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 17:43:51,087 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:51,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 17:43:51,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=373, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:43:51,088 INFO L87 Difference]: Start difference. First operand 189 states and 262 transitions. Second operand 23 states. [2019-10-13 17:43:51,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:51,501 INFO L93 Difference]: Finished difference Result 372 states and 527 transitions. [2019-10-13 17:43:51,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 17:43:51,502 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 69 [2019-10-13 17:43:51,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:51,504 INFO L225 Difference]: With dead ends: 372 [2019-10-13 17:43:51,504 INFO L226 Difference]: Without dead ends: 208 [2019-10-13 17:43:51,506 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=263, Invalid=793, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:43:51,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2019-10-13 17:43:51,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 197. [2019-10-13 17:43:51,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-10-13 17:43:51,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 272 transitions. [2019-10-13 17:43:51,527 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 272 transitions. Word has length 69 [2019-10-13 17:43:51,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:51,528 INFO L462 AbstractCegarLoop]: Abstraction has 197 states and 272 transitions. [2019-10-13 17:43:51,528 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 17:43:51,528 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 272 transitions. [2019-10-13 17:43:51,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-13 17:43:51,529 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:51,529 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:51,733 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:51,734 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:51,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:51,734 INFO L82 PathProgramCache]: Analyzing trace with hash -158999393, now seen corresponding path program 9 times [2019-10-13 17:43:51,735 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:51,735 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191260096] [2019-10-13 17:43:51,735 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:51,735 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:51,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:51,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:51,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:51,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:51,988 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 2 proven. 117 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2019-10-13 17:43:51,989 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191260096] [2019-10-13 17:43:51,989 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631234217] [2019-10-13 17:43:51,989 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:52,122 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-13 17:43:52,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:52,124 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:43:52,125 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:52,290 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 104 trivial. 0 not checked. [2019-10-13 17:43:52,290 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:52,290 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2019-10-13 17:43:52,290 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334016023] [2019-10-13 17:43:52,292 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-13 17:43:52,292 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:52,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-13 17:43:52,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=387, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:43:52,293 INFO L87 Difference]: Start difference. First operand 197 states and 272 transitions. Second operand 25 states. [2019-10-13 17:43:52,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:52,596 INFO L93 Difference]: Finished difference Result 327 states and 466 transitions. [2019-10-13 17:43:52,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:43:52,597 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 74 [2019-10-13 17:43:52,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:52,599 INFO L225 Difference]: With dead ends: 327 [2019-10-13 17:43:52,600 INFO L226 Difference]: Without dead ends: 213 [2019-10-13 17:43:52,600 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=213, Invalid=387, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:43:52,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2019-10-13 17:43:52,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 203. [2019-10-13 17:43:52,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2019-10-13 17:43:52,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 280 transitions. [2019-10-13 17:43:52,613 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 280 transitions. Word has length 74 [2019-10-13 17:43:52,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:52,613 INFO L462 AbstractCegarLoop]: Abstraction has 203 states and 280 transitions. [2019-10-13 17:43:52,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-13 17:43:52,613 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 280 transitions. [2019-10-13 17:43:52,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-13 17:43:52,614 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:52,614 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:52,818 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:52,819 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:52,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:52,819 INFO L82 PathProgramCache]: Analyzing trace with hash -565740084, now seen corresponding path program 10 times [2019-10-13 17:43:52,820 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:52,820 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822954341] [2019-10-13 17:43:52,821 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:52,821 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:52,821 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:52,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:52,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:52,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:52,993 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 145 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2019-10-13 17:43:52,993 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822954341] [2019-10-13 17:43:52,993 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555432578] [2019-10-13 17:43:52,994 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:53,059 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:53,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:53,061 INFO L256 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:43:53,062 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2019-10-13 17:43:53,162 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:53,162 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2019-10-13 17:43:53,163 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738292775] [2019-10-13 17:43:53,163 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-13 17:43:53,163 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:53,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-13 17:43:53,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=480, Unknown=0, NotChecked=0, Total=650 [2019-10-13 17:43:53,164 INFO L87 Difference]: Start difference. First operand 203 states and 280 transitions. Second operand 26 states. [2019-10-13 17:43:53,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:53,595 INFO L93 Difference]: Finished difference Result 398 states and 561 transitions. [2019-10-13 17:43:53,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-13 17:43:53,596 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 77 [2019-10-13 17:43:53,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:53,598 INFO L225 Difference]: With dead ends: 398 [2019-10-13 17:43:53,598 INFO L226 Difference]: Without dead ends: 222 [2019-10-13 17:43:53,599 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=324, Invalid=1008, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 17:43:53,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2019-10-13 17:43:53,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 211. [2019-10-13 17:43:53,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2019-10-13 17:43:53,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 290 transitions. [2019-10-13 17:43:53,623 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 290 transitions. Word has length 77 [2019-10-13 17:43:53,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:53,624 INFO L462 AbstractCegarLoop]: Abstraction has 211 states and 290 transitions. [2019-10-13 17:43:53,624 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-13 17:43:53,624 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 290 transitions. [2019-10-13 17:43:53,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-10-13 17:43:53,625 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:53,626 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:53,830 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:53,830 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:53,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:53,831 INFO L82 PathProgramCache]: Analyzing trace with hash -205668511, now seen corresponding path program 11 times [2019-10-13 17:43:53,831 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:53,831 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033356652] [2019-10-13 17:43:53,831 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,831 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,832 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:53,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:54,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:54,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:54,042 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 2 proven. 176 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2019-10-13 17:43:54,042 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033356652] [2019-10-13 17:43:54,043 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012852958] [2019-10-13 17:43:54,043 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:54,232 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 17:43:54,233 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:54,235 INFO L256 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:43:54,236 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:54,404 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2019-10-13 17:43:54,404 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:54,404 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2019-10-13 17:43:54,405 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850928487] [2019-10-13 17:43:54,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 17:43:54,405 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:54,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 17:43:54,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:43:54,406 INFO L87 Difference]: Start difference. First operand 211 states and 290 transitions. Second operand 29 states. [2019-10-13 17:43:56,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:56,326 INFO L93 Difference]: Finished difference Result 1076 states and 1558 transitions. [2019-10-13 17:43:56,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-10-13 17:43:56,327 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 82 [2019-10-13 17:43:56,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:56,332 INFO L225 Difference]: With dead ends: 1076 [2019-10-13 17:43:56,332 INFO L226 Difference]: Without dead ends: 890 [2019-10-13 17:43:56,334 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=638, Invalid=2118, Unknown=0, NotChecked=0, Total=2756 [2019-10-13 17:43:56,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 890 states. [2019-10-13 17:43:56,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 890 to 243. [2019-10-13 17:43:56,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2019-10-13 17:43:56,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 340 transitions. [2019-10-13 17:43:56,359 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 340 transitions. Word has length 82 [2019-10-13 17:43:56,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:56,359 INFO L462 AbstractCegarLoop]: Abstraction has 243 states and 340 transitions. [2019-10-13 17:43:56,360 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-13 17:43:56,360 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 340 transitions. [2019-10-13 17:43:56,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-13 17:43:56,360 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:56,361 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:56,565 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,565 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:56,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:56,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1169742632, now seen corresponding path program 12 times [2019-10-13 17:43:56,566 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:56,566 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487982064] [2019-10-13 17:43:56,566 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,567 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,567 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:56,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:56,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:56,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:56,740 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 2 proven. 210 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:56,741 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487982064] [2019-10-13 17:43:56,741 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578216308] [2019-10-13 17:43:56,741 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,978 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:43:56,978 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:56,980 INFO L256 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:43:56,981 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:57,208 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-10-13 17:43:57,208 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:57,208 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 32 [2019-10-13 17:43:57,208 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462022450] [2019-10-13 17:43:57,209 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-13 17:43:57,209 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:57,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-13 17:43:57,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=774, Unknown=0, NotChecked=0, Total=992 [2019-10-13 17:43:57,210 INFO L87 Difference]: Start difference. First operand 243 states and 340 transitions. Second operand 32 states. [2019-10-13 17:43:59,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:59,986 INFO L93 Difference]: Finished difference Result 1022 states and 1491 transitions. [2019-10-13 17:43:59,988 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-10-13 17:43:59,988 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 87 [2019-10-13 17:43:59,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:59,993 INFO L225 Difference]: With dead ends: 1022 [2019-10-13 17:43:59,993 INFO L226 Difference]: Without dead ends: 884 [2019-10-13 17:43:59,996 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1037, Invalid=3933, Unknown=0, NotChecked=0, Total=4970 [2019-10-13 17:43:59,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 884 states. [2019-10-13 17:44:00,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 884 to 255. [2019-10-13 17:44:00,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2019-10-13 17:44:00,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 358 transitions. [2019-10-13 17:44:00,022 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 358 transitions. Word has length 87 [2019-10-13 17:44:00,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:00,022 INFO L462 AbstractCegarLoop]: Abstraction has 255 states and 358 transitions. [2019-10-13 17:44:00,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-13 17:44:00,023 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 358 transitions. [2019-10-13 17:44:00,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-10-13 17:44:00,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:00,024 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:00,230 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:00,230 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:00,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:00,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1569326755, now seen corresponding path program 13 times [2019-10-13 17:44:00,231 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:00,231 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586750658] [2019-10-13 17:44:00,231 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:00,231 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:00,231 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:00,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:00,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:00,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:00,444 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 2 proven. 247 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:44:00,444 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586750658] [2019-10-13 17:44:00,444 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818037126] [2019-10-13 17:44:00,444 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:00,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:00,525 INFO L256 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:44:00,526 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:00,722 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 251 trivial. 0 not checked. [2019-10-13 17:44:00,723 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:00,723 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 32 [2019-10-13 17:44:00,723 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901492657] [2019-10-13 17:44:00,724 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-13 17:44:00,724 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:00,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-13 17:44:00,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=761, Unknown=0, NotChecked=0, Total=992 [2019-10-13 17:44:00,725 INFO L87 Difference]: Start difference. First operand 255 states and 358 transitions. Second operand 32 states. [2019-10-13 17:44:02,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:02,977 INFO L93 Difference]: Finished difference Result 1170 states and 1698 transitions. [2019-10-13 17:44:02,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2019-10-13 17:44:02,977 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 90 [2019-10-13 17:44:02,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:02,982 INFO L225 Difference]: With dead ends: 1170 [2019-10-13 17:44:02,983 INFO L226 Difference]: Without dead ends: 942 [2019-10-13 17:44:02,984 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=826, Invalid=2714, Unknown=0, NotChecked=0, Total=3540 [2019-10-13 17:44:02,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2019-10-13 17:44:03,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 269. [2019-10-13 17:44:03,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2019-10-13 17:44:03,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 378 transitions. [2019-10-13 17:44:03,010 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 378 transitions. Word has length 90 [2019-10-13 17:44:03,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:03,011 INFO L462 AbstractCegarLoop]: Abstraction has 269 states and 378 transitions. [2019-10-13 17:44:03,011 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-13 17:44:03,011 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 378 transitions. [2019-10-13 17:44:03,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-13 17:44:03,012 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:03,012 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:03,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:03,216 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:03,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:03,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1949496998, now seen corresponding path program 14 times [2019-10-13 17:44:03,217 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:03,217 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073127648] [2019-10-13 17:44:03,218 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:03,218 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:03,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:03,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:03,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:03,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:03,474 INFO L134 CoverageAnalysis]: Checked inductivity of 460 backedges. 2 proven. 287 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-10-13 17:44:03,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073127648] [2019-10-13 17:44:03,474 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833489830] [2019-10-13 17:44:03,474 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:03,567 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:44:03,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:03,569 INFO L256 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:44:03,570 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:03,708 INFO L134 CoverageAnalysis]: Checked inductivity of 460 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2019-10-13 17:44:03,709 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:03,709 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 33 [2019-10-13 17:44:03,709 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757717396] [2019-10-13 17:44:03,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-13 17:44:03,710 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:03,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-13 17:44:03,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:44:03,711 INFO L87 Difference]: Start difference. First operand 269 states and 378 transitions. Second operand 33 states. [2019-10-13 17:44:04,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:04,343 INFO L93 Difference]: Finished difference Result 524 states and 751 transitions. [2019-10-13 17:44:04,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-13 17:44:04,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2019-10-13 17:44:04,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:04,345 INFO L225 Difference]: With dead ends: 524 [2019-10-13 17:44:04,345 INFO L226 Difference]: Without dead ends: 288 [2019-10-13 17:44:04,346 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=512, Invalid=1650, Unknown=0, NotChecked=0, Total=2162 [2019-10-13 17:44:04,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2019-10-13 17:44:04,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 277. [2019-10-13 17:44:04,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2019-10-13 17:44:04,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 388 transitions. [2019-10-13 17:44:04,364 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 388 transitions. Word has length 95 [2019-10-13 17:44:04,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:04,365 INFO L462 AbstractCegarLoop]: Abstraction has 277 states and 388 transitions. [2019-10-13 17:44:04,365 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-13 17:44:04,365 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 388 transitions. [2019-10-13 17:44:04,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-10-13 17:44:04,366 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:04,366 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:04,569 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:04,569 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:04,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:04,570 INFO L82 PathProgramCache]: Analyzing trace with hash -511480889, now seen corresponding path program 15 times [2019-10-13 17:44:04,570 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:04,571 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820173580] [2019-10-13 17:44:04,571 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:04,571 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:04,571 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:04,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:04,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:04,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:04,941 INFO L134 CoverageAnalysis]: Checked inductivity of 530 backedges. 2 proven. 330 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2019-10-13 17:44:04,942 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820173580] [2019-10-13 17:44:04,942 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230703447] [2019-10-13 17:44:04,942 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:05,194 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2019-10-13 17:44:05,194 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:05,196 INFO L256 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:44:05,199 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:05,471 INFO L134 CoverageAnalysis]: Checked inductivity of 530 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2019-10-13 17:44:05,472 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:05,472 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 17] total 36 [2019-10-13 17:44:05,472 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6798153] [2019-10-13 17:44:05,472 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-13 17:44:05,473 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:05,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-13 17:44:05,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=965, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:44:05,473 INFO L87 Difference]: Start difference. First operand 277 states and 388 transitions. Second operand 36 states. [2019-10-13 17:44:08,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:08,121 INFO L93 Difference]: Finished difference Result 1338 states and 1944 transitions. [2019-10-13 17:44:08,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-10-13 17:44:08,122 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 100 [2019-10-13 17:44:08,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:08,127 INFO L225 Difference]: With dead ends: 1338 [2019-10-13 17:44:08,127 INFO L226 Difference]: Without dead ends: 1092 [2019-10-13 17:44:08,129 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1055, Invalid=3501, Unknown=0, NotChecked=0, Total=4556 [2019-10-13 17:44:08,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1092 states. [2019-10-13 17:44:08,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1092 to 297. [2019-10-13 17:44:08,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2019-10-13 17:44:08,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 418 transitions. [2019-10-13 17:44:08,160 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 418 transitions. Word has length 100 [2019-10-13 17:44:08,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:08,161 INFO L462 AbstractCegarLoop]: Abstraction has 297 states and 418 transitions. [2019-10-13 17:44:08,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-13 17:44:08,161 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 418 transitions. [2019-10-13 17:44:08,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-10-13 17:44:08,162 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:08,162 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:08,366 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:08,367 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:08,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:08,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1475096962, now seen corresponding path program 16 times [2019-10-13 17:44:08,368 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:08,368 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199466331] [2019-10-13 17:44:08,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:08,368 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:08,369 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:08,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:08,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:08,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:08,681 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 2 proven. 376 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2019-10-13 17:44:08,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199466331] [2019-10-13 17:44:08,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688932143] [2019-10-13 17:44:08,682 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:08,823 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:44:08,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:08,826 INFO L256 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-13 17:44:08,829 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:09,074 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 380 trivial. 0 not checked. [2019-10-13 17:44:09,074 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:09,074 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 37 [2019-10-13 17:44:09,074 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910259873] [2019-10-13 17:44:09,075 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-13 17:44:09,075 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:09,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-13 17:44:09,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 17:44:09,076 INFO L87 Difference]: Start difference. First operand 297 states and 418 transitions. Second operand 37 states. [2019-10-13 17:44:09,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:09,785 INFO L93 Difference]: Finished difference Result 576 states and 827 transitions. [2019-10-13 17:44:09,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2019-10-13 17:44:09,785 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2019-10-13 17:44:09,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:09,787 INFO L225 Difference]: With dead ends: 576 [2019-10-13 17:44:09,787 INFO L226 Difference]: Without dead ends: 316 [2019-10-13 17:44:09,789 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=648, Invalid=2108, Unknown=0, NotChecked=0, Total=2756 [2019-10-13 17:44:09,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2019-10-13 17:44:09,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 305. [2019-10-13 17:44:09,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2019-10-13 17:44:09,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 428 transitions. [2019-10-13 17:44:09,816 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 428 transitions. Word has length 105 [2019-10-13 17:44:09,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:09,817 INFO L462 AbstractCegarLoop]: Abstraction has 305 states and 428 transitions. [2019-10-13 17:44:09,817 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-13 17:44:09,817 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 428 transitions. [2019-10-13 17:44:09,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2019-10-13 17:44:09,818 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:09,818 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:10,022 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:10,022 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:10,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:10,023 INFO L82 PathProgramCache]: Analyzing trace with hash -169008917, now seen corresponding path program 17 times [2019-10-13 17:44:10,023 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:10,023 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727302634] [2019-10-13 17:44:10,023 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:10,023 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:10,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:10,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:10,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:10,397 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 2 proven. 425 refuted. 0 times theorem prover too weak. 258 trivial. 0 not checked. [2019-10-13 17:44:10,397 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727302634] [2019-10-13 17:44:10,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411290019] [2019-10-13 17:44:10,398 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:10,811 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-13 17:44:10,811 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:10,815 INFO L256 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:44:10,817 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:10,976 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2019-10-13 17:44:10,977 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:10,977 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 39 [2019-10-13 17:44:10,977 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600606402] [2019-10-13 17:44:10,978 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-13 17:44:10,978 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:10,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-13 17:44:10,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2019-10-13 17:44:10,979 INFO L87 Difference]: Start difference. First operand 305 states and 428 transitions. Second operand 39 states. [2019-10-13 17:44:11,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:11,751 INFO L93 Difference]: Finished difference Result 590 states and 845 transitions. [2019-10-13 17:44:11,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-13 17:44:11,752 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 110 [2019-10-13 17:44:11,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:11,753 INFO L225 Difference]: With dead ends: 590 [2019-10-13 17:44:11,753 INFO L226 Difference]: Without dead ends: 324 [2019-10-13 17:44:11,755 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=722, Invalid=2358, Unknown=0, NotChecked=0, Total=3080 [2019-10-13 17:44:11,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2019-10-13 17:44:11,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 313. [2019-10-13 17:44:11,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2019-10-13 17:44:11,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 438 transitions. [2019-10-13 17:44:11,775 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 438 transitions. Word has length 110 [2019-10-13 17:44:11,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:11,776 INFO L462 AbstractCegarLoop]: Abstraction has 313 states and 438 transitions. [2019-10-13 17:44:11,776 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-13 17:44:11,776 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 438 transitions. [2019-10-13 17:44:11,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-10-13 17:44:11,777 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:11,777 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:11,981 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:11,982 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:11,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:11,982 INFO L82 PathProgramCache]: Analyzing trace with hash 710540382, now seen corresponding path program 18 times [2019-10-13 17:44:11,983 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:11,983 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442134971] [2019-10-13 17:44:11,983 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:11,983 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:11,984 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:12,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:12,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:12,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:12,312 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 2 proven. 477 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2019-10-13 17:44:12,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442134971] [2019-10-13 17:44:12,313 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1400103490] [2019-10-13 17:44:12,313 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:12,949 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-13 17:44:12,949 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:12,952 INFO L256 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 17:44:12,954 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:13,327 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2019-10-13 17:44:13,327 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:13,327 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2019-10-13 17:44:13,328 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592081805] [2019-10-13 17:44:13,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-13 17:44:13,328 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:13,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-13 17:44:13,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=1464, Unknown=0, NotChecked=0, Total=1892 [2019-10-13 17:44:13,329 INFO L87 Difference]: Start difference. First operand 313 states and 438 transitions. Second operand 44 states. [2019-10-13 17:44:17,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:17,430 INFO L93 Difference]: Finished difference Result 1470 states and 2153 transitions. [2019-10-13 17:44:17,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2019-10-13 17:44:17,430 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 115 [2019-10-13 17:44:17,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:17,435 INFO L225 Difference]: With dead ends: 1470 [2019-10-13 17:44:17,435 INFO L226 Difference]: Without dead ends: 1308 [2019-10-13 17:44:17,439 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2202 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2081, Invalid=8019, Unknown=0, NotChecked=0, Total=10100 [2019-10-13 17:44:17,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1308 states. [2019-10-13 17:44:17,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1308 to 337. [2019-10-13 17:44:17,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2019-10-13 17:44:17,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 476 transitions. [2019-10-13 17:44:17,474 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 476 transitions. Word has length 115 [2019-10-13 17:44:17,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:17,475 INFO L462 AbstractCegarLoop]: Abstraction has 337 states and 476 transitions. [2019-10-13 17:44:17,475 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-13 17:44:17,475 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 476 transitions. [2019-10-13 17:44:17,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-10-13 17:44:17,476 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:17,476 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 19, 17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:17,681 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:17,681 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:17,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:17,681 INFO L82 PathProgramCache]: Analyzing trace with hash 945934765, now seen corresponding path program 19 times [2019-10-13 17:44:17,682 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:17,682 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374229253] [2019-10-13 17:44:17,682 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:17,682 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:17,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:17,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:18,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:18,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:18,259 INFO L134 CoverageAnalysis]: Checked inductivity of 825 backedges. 2 proven. 532 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2019-10-13 17:44:18,259 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374229253] [2019-10-13 17:44:18,259 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14900384] [2019-10-13 17:44:18,259 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:18,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:18,402 INFO L256 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-13 17:44:18,405 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:18,665 INFO L134 CoverageAnalysis]: Checked inductivity of 825 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2019-10-13 17:44:18,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:18,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 20] total 42 [2019-10-13 17:44:18,666 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806486329] [2019-10-13 17:44:18,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 42 states [2019-10-13 17:44:18,667 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:18,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2019-10-13 17:44:18,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=1278, Unknown=0, NotChecked=0, Total=1722 [2019-10-13 17:44:18,668 INFO L87 Difference]: Start difference. First operand 337 states and 476 transitions. Second operand 42 states.