java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:54:25,908 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:54:25,910 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:54:25,925 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:54:25,926 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:54:25,927 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:54:25,928 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:54:25,930 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:54:25,931 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:54:25,932 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:54:25,933 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:54:25,934 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:54:25,934 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:54:25,935 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:54:25,936 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:54:25,937 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:54:25,938 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:54:25,940 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:54:25,942 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:54:25,944 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:54:25,945 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:54:25,946 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:54:25,949 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:54:25,958 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:54:25,974 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:54:25,974 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:54:25,975 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:54:25,975 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:54:25,976 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:54:25,976 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:54:25,976 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:54:25,977 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:54:25,977 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:54:25,977 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:54:25,977 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:54:25,977 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:54:25,978 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:54:25,978 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:54:25,978 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:54:25,978 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:54:25,978 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:54:25,978 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:54:25,979 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:54:25,979 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:25,979 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:54:25,979 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:54:25,979 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:54:25,980 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:54:25,980 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:54:25,980 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:54:25,980 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:54:25,980 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:54:26,045 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:54:26,066 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:54:26,071 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:54:26,073 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:54:26,073 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:54:26,074 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-10-24 11:54:26,146 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/463cb19b9/a7d18b50e2d64890993ad1ae3beb4a2c/FLAG04c3259d6 [2018-10-24 11:54:26,571 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:54:26,571 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-10-24 11:54:26,577 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/463cb19b9/a7d18b50e2d64890993ad1ae3beb4a2c/FLAG04c3259d6 [2018-10-24 11:54:26,592 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/463cb19b9/a7d18b50e2d64890993ad1ae3beb4a2c [2018-10-24 11:54:26,602 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:54:26,603 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:54:26,604 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:26,604 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:54:26,608 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:54:26,609 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,612 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18e44861 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26, skipping insertion in model container [2018-10-24 11:54:26,612 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,623 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:54:26,644 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:54:26,819 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:26,824 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:54:26,842 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:26,860 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:54:26,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26 WrapperNode [2018-10-24 11:54:26,861 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:26,862 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:26,862 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:54:26,862 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:54:26,873 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,879 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,902 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:26,903 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:54:26,903 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:54:26,904 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:54:26,914 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,914 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,915 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,915 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,917 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,923 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,924 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... [2018-10-24 11:54:26,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:54:26,926 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:54:26,926 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:54:26,926 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:54:26,927 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 11:54:27,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:54:27,050 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:54:27,240 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:54:27,241 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:27 BoogieIcfgContainer [2018-10-24 11:54:27,241 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:54:27,242 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:54:27,242 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:54:27,245 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:54:27,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:54:26" (1/3) ... [2018-10-24 11:54:27,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b48c523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:27, skipping insertion in model container [2018-10-24 11:54:27,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:26" (2/3) ... [2018-10-24 11:54:27,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b48c523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:27, skipping insertion in model container [2018-10-24 11:54:27,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:27" (3/3) ... [2018-10-24 11:54:27,249 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_true-unreach-call1.i [2018-10-24 11:54:27,259 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:54:27,266 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:54:27,283 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:54:27,316 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:54:27,317 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:54:27,317 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:54:27,317 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:54:27,317 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:54:27,318 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:54:27,318 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:54:27,318 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:54:27,318 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:54:27,333 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-24 11:54:27,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:54:27,339 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:27,340 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:54:27,343 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:27,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:27,350 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-24 11:54:27,352 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:27,353 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:27,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:27,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:27,473 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:27,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:54:27,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:54:27,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:54:27,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:27,493 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-24 11:54:27,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:27,511 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-24 11:54:27,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:54:27,513 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:54:27,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:27,524 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:54:27,524 INFO L226 Difference]: Without dead ends: 8 [2018-10-24 11:54:27,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:27,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-24 11:54:27,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-24 11:54:27,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-24 11:54:27,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-24 11:54:27,565 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-24 11:54:27,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:27,565 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-24 11:54:27,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:54:27,565 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-24 11:54:27,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:54:27,566 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:27,566 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:27,566 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:27,567 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:27,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-24 11:54:27,567 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:27,567 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:27,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:27,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:27,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:27,691 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:27,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:54:27,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:54:27,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:54:27,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:27,694 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-24 11:54:27,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:27,767 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-24 11:54:27,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:54:27,768 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:54:27,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:27,768 INFO L225 Difference]: With dead ends: 14 [2018-10-24 11:54:27,769 INFO L226 Difference]: Without dead ends: 10 [2018-10-24 11:54:27,776 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:27,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-24 11:54:27,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-24 11:54:27,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-24 11:54:27,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-24 11:54:27,783 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-24 11:54:27,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:27,783 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-24 11:54:27,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:54:27,783 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-24 11:54:27,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-24 11:54:27,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:27,784 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:27,784 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:27,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:27,785 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-24 11:54:27,785 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:27,785 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:27,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:27,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:27,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:27,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:27,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:27,951 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:27,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:27,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:27,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:28,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:28,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:28,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:54:28,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:54:28,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:54:28,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:54:28,057 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-24 11:54:28,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:28,105 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:54:28,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:54:28,105 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-24 11:54:28,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:28,106 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:54:28,106 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:54:28,107 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:54:28,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:54:28,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:54:28,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:54:28,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 11:54:28,112 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-24 11:54:28,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:28,112 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 11:54:28,112 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:54:28,112 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 11:54:28,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 11:54:28,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:28,113 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:28,113 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:28,114 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:28,114 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-24 11:54:28,114 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:28,114 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:28,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:28,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:28,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:28,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:28,265 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:28,277 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:28,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:28,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:28,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:28,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:28,334 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:28,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:54:28,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:54:28,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:54:28,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:28,336 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-24 11:54:28,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:28,440 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-24 11:54:28,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:54:28,441 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-24 11:54:28,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:28,442 INFO L225 Difference]: With dead ends: 18 [2018-10-24 11:54:28,442 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 11:54:28,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:28,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 11:54:28,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 11:54:28,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:54:28,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:54:28,446 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 11:54:28,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:28,446 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:54:28,446 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:54:28,446 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:54:28,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:54:28,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:28,447 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:28,447 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:28,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:28,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-24 11:54:28,448 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:28,448 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:28,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:28,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:28,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:28,772 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:28,783 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:28,800 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:54:28,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:28,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:28,839 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:28,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:28,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-24 11:54:28,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:54:28,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:54:28,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:54:28,863 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 11:54:28,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:28,915 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-24 11:54:28,916 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:54:28,916 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-24 11:54:28,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:28,917 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:54:28,917 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 11:54:28,918 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:54:28,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 11:54:28,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 11:54:28,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 11:54:28,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 11:54:28,921 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 11:54:28,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:28,922 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 11:54:28,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:54:28,922 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 11:54:28,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 11:54:28,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:28,923 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:28,923 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:28,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:28,924 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-24 11:54:28,924 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:28,924 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:28,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,925 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:28,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:28,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:29,096 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:29,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:29,097 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:29,109 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:29,149 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:29,149 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:29,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:29,228 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:29,250 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:29,250 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:54:29,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:54:29,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:54:29,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:29,251 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 11:54:29,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:29,361 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:54:29,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:54:29,361 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 11:54:29,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:29,362 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:54:29,362 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:54:29,363 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:29,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:54:29,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:54:29,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:54:29,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 11:54:29,368 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 11:54:29,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:29,368 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 11:54:29,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:54:29,368 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 11:54:29,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:54:29,369 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:29,369 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:29,370 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:29,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:29,370 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-24 11:54:29,370 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:29,370 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:29,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:29,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:29,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:29,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:29,581 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:29,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:29,582 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:29,597 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:54:29,682 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:54:29,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:29,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:29,715 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:29,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:29,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-24 11:54:29,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:54:29,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:54:29,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:29,746 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-24 11:54:30,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:30,061 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 11:54:30,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:54:30,061 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-24 11:54:30,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:30,062 INFO L225 Difference]: With dead ends: 24 [2018-10-24 11:54:30,062 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 11:54:30,063 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:30,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 11:54:30,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 11:54:30,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:54:30,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:54:30,067 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 11:54:30,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:30,068 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:54:30,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:54:30,068 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:54:30,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:54:30,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:30,069 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:30,069 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:30,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:30,070 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-24 11:54:30,070 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:30,070 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:30,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:30,319 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:30,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:30,319 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:30,328 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:54:30,345 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-24 11:54:30,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:30,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:30,365 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:30,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:30,386 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:54:30,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:54:30,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:54:30,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:30,387 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-24 11:54:30,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:30,479 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-24 11:54:30,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 11:54:30,480 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-24 11:54:30,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:30,481 INFO L225 Difference]: With dead ends: 26 [2018-10-24 11:54:30,481 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 11:54:30,481 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:30,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 11:54:30,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 11:54:30,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 11:54:30,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 11:54:30,486 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 11:54:30,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:30,486 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 11:54:30,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:54:30,486 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 11:54:30,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 11:54:30,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:30,487 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:30,487 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:30,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:30,488 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-24 11:54:30,488 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:30,488 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:30,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:30,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:30,728 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:30,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:30,729 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:30,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:30,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:30,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:30,775 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:30,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:30,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-24 11:54:30,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 11:54:30,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 11:54:30,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:54:30,797 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-24 11:54:30,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:30,924 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-24 11:54:30,926 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:54:30,926 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-24 11:54:30,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:30,927 INFO L225 Difference]: With dead ends: 28 [2018-10-24 11:54:30,927 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:54:30,927 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-24 11:54:30,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:54:30,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 11:54:30,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 11:54:30,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 11:54:30,932 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 11:54:30,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:30,932 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 11:54:30,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 11:54:30,933 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 11:54:30,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 11:54:30,933 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:30,934 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:30,934 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:30,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:30,934 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-24 11:54:30,934 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:30,935 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:30,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,936 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:30,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:30,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:31,230 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:31,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:31,230 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:31,240 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:31,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:31,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:31,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:31,284 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:31,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:31,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-24 11:54:31,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 11:54:31,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 11:54:31,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:31,306 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-24 11:54:31,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:31,442 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 11:54:31,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:54:31,444 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-24 11:54:31,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:31,445 INFO L225 Difference]: With dead ends: 30 [2018-10-24 11:54:31,445 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:54:31,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-24 11:54:31,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:54:31,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:54:31,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:54:31,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 11:54:31,450 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 11:54:31,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:31,451 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 11:54:31,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 11:54:31,451 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 11:54:31,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:54:31,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:31,452 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:31,452 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:31,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:31,453 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-24 11:54:31,453 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:31,453 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:31,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:31,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:31,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:31,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:31,726 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:31,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:31,727 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:31,735 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:31,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 11:54:31,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:31,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:31,804 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:31,825 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:31,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-24 11:54:31,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:54:31,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:54:31,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:31,826 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-24 11:54:32,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:32,045 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-24 11:54:32,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:54:32,045 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-24 11:54:32,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:32,046 INFO L225 Difference]: With dead ends: 32 [2018-10-24 11:54:32,046 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 11:54:32,047 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:32,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 11:54:32,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 11:54:32,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 11:54:32,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 11:54:32,052 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 11:54:32,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:32,053 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 11:54:32,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:54:32,053 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 11:54:32,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 11:54:32,054 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:32,054 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:32,054 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:32,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:32,054 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-24 11:54:32,055 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:32,055 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:32,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:32,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:32,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:32,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:32,402 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:32,402 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:32,402 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:32,418 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:32,443 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:32,443 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:32,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:32,463 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:32,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:32,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-24 11:54:32,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:54:32,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:54:32,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:54:32,486 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-24 11:54:32,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:32,721 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-24 11:54:32,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:54:32,722 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-24 11:54:32,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:32,722 INFO L225 Difference]: With dead ends: 34 [2018-10-24 11:54:32,723 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 11:54:32,723 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:54:32,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 11:54:32,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 11:54:32,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 11:54:32,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 11:54:32,728 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 11:54:32,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:32,729 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 11:54:32,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:54:32,729 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 11:54:32,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 11:54:32,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:32,730 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:32,730 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:32,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:32,731 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-24 11:54:32,731 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:32,731 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:32,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:32,732 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:32,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:32,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:33,086 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:33,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:33,086 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:33,095 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:55:10,644 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-24 11:55:10,644 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:10,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:10,908 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:10,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:10,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-24 11:55:10,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 11:55:10,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 11:55:10,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:55:10,914 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-24 11:55:11,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:11,067 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 11:55:11,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:55:11,067 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-24 11:55:11,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:11,069 INFO L225 Difference]: With dead ends: 36 [2018-10-24 11:55:11,069 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 11:55:11,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-24 11:55:11,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 11:55:11,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 11:55:11,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 11:55:11,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 11:55:11,076 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 11:55:11,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:11,076 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 11:55:11,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 11:55:11,077 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 11:55:11,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 11:55:11,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:11,078 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:11,078 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:11,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:11,078 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-24 11:55:11,079 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:11,079 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:11,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:11,080 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:11,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:11,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:11,383 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:11,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:11,384 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:11,392 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:56:25,525 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-24 11:56:25,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:56:26,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:26,315 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:26,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:26,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-24 11:56:26,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 11:56:26,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 11:56:26,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:56:26,336 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-24 11:56:26,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:26,597 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-24 11:56:26,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 11:56:26,598 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-24 11:56:26,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:26,599 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:56:26,599 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 11:56:26,599 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-24 11:56:26,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 11:56:26,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 11:56:26,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 11:56:26,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 11:56:26,605 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 11:56:26,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:26,606 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 11:56:26,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 11:56:26,606 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 11:56:26,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 11:56:26,607 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:26,607 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:26,607 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:26,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:26,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-24 11:56:26,607 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:26,608 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:26,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:26,608 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:56:26,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:26,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:27,255 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:27,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:27,256 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:27,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:56:27,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:27,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:27,359 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:27,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:27,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-24 11:56:27,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:56:27,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:56:27,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:56:27,391 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-24 11:56:27,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:27,845 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-24 11:56:27,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:56:27,845 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-24 11:56:27,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:27,847 INFO L225 Difference]: With dead ends: 40 [2018-10-24 11:56:27,847 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 11:56:27,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:56:27,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 11:56:27,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 11:56:27,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 11:56:27,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 11:56:27,853 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 11:56:27,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:27,854 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 11:56:27,856 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:56:27,856 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 11:56:27,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 11:56:27,857 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:27,857 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:27,857 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:27,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:27,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-24 11:56:27,858 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:27,858 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:27,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:27,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:56:27,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:27,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:28,228 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:28,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:28,228 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:28,236 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:56:28,273 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:56:28,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:56:28,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:56:28,337 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:28,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:56:28,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:56:28,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:56:28,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:56:28,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:56:28,374 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-24 11:56:28,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:56:28,752 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 11:56:28,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 11:56:28,753 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-24 11:56:28,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:56:28,754 INFO L225 Difference]: With dead ends: 42 [2018-10-24 11:56:28,754 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:56:28,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:56:28,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:56:28,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:56:28,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:56:28,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 11:56:28,760 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 11:56:28,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:56:28,760 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 11:56:28,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:56:28,761 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 11:56:28,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:56:28,761 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:56:28,762 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-24 11:56:28,762 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:56:28,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:56:28,762 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-24 11:56:28,763 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:56:28,763 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:56:28,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:28,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:56:28,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:56:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:56:29,048 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:56:29,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:56:29,049 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:56:29,057 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:58:12,085 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 11:58:12,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:58:12,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:58:12,606 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:12,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:58:12,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-24 11:58:12,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 11:58:12,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 11:58:12,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:58:12,629 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-24 11:58:13,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:58:13,050 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-24 11:58:13,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 11:58:13,050 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-24 11:58:13,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:58:13,051 INFO L225 Difference]: With dead ends: 44 [2018-10-24 11:58:13,051 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 11:58:13,052 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-24 11:58:13,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 11:58:13,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-24 11:58:13,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 11:58:13,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-24 11:58:13,057 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-24 11:58:13,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:58:13,057 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-24 11:58:13,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 11:58:13,057 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-24 11:58:13,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 11:58:13,058 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:58:13,058 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-24 11:58:13,058 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:58:13,058 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:58:13,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-24 11:58:13,059 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:58:13,059 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:58:13,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:13,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:58:13,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:13,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:58:13,999 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:13,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:58:13,999 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:58:14,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:58:14,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:58:14,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:58:14,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:58:14,065 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:14,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:58:14,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-24 11:58:14,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 11:58:14,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 11:58:14,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:58:14,098 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-24 11:58:14,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:58:14,440 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-24 11:58:14,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 11:58:14,440 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-24 11:58:14,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:58:14,441 INFO L225 Difference]: With dead ends: 46 [2018-10-24 11:58:14,441 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 11:58:14,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:58:14,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 11:58:14,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-24 11:58:14,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 11:58:14,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 11:58:14,448 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-24 11:58:14,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:58:14,448 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 11:58:14,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 11:58:14,448 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 11:58:14,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 11:58:14,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:58:14,449 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-24 11:58:14,450 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:58:14,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:58:14,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-24 11:58:14,450 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:58:14,450 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:58:14,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:14,451 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:58:14,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:58:14,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:58:15,134 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:58:15,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:58:15,134 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:58:15,142 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown