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_false-unreach-call4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-26 22:23:57,236 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 22:23:57,238 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 22:23:57,250 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 22:23:57,251 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 22:23:57,252 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 22:23:57,254 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 22:23:57,256 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 22:23:57,259 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 22:23:57,259 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 22:23:57,260 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 22:23:57,262 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 22:23:57,263 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 22:23:57,265 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 22:23:57,276 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 22:23:57,277 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 22:23:57,278 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 22:23:57,279 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 22:23:57,283 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 22:23:57,286 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 22:23:57,288 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 22:23:57,289 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 22:23:57,293 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-26 22:23:57,309 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 [2018-10-26 22:23:57,326 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 22:23:57,327 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 22:23:57,327 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 22:23:57,328 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-26 22:23:57,328 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-26 22:23:57,328 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-26 22:23:57,329 INFO L133 SettingsManager]: * Use SBE=true [2018-10-26 22:23:57,329 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 22:23:57,329 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 22:23:57,329 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 22:23:57,329 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 22:23:57,330 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 22:23:57,330 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 22:23:57,330 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 22:23:57,330 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 22:23:57,331 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 22:23:57,332 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 22:23:57,332 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 22:23:57,332 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 22:23:57,332 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 22:23:57,333 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 22:23:57,333 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 22:23:57,333 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 22:23:57,333 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-26 22:23:57,333 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 22:23:57,334 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 22:23:57,334 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 22:23:57,334 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-26 22:23:57,394 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 22:23:57,410 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 22:23:57,414 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 22:23:57,416 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 22:23:57,416 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 22:23:57,417 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-26 22:23:57,482 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df721cb4c/7d7f0a4ff93545c1b32f612c67cabaf7/FLAG2595abedc [2018-10-26 22:23:57,935 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 22:23:57,935 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-26 22:23:57,941 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df721cb4c/7d7f0a4ff93545c1b32f612c67cabaf7/FLAG2595abedc [2018-10-26 22:23:57,957 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/df721cb4c/7d7f0a4ff93545c1b32f612c67cabaf7 [2018-10-26 22:23:57,967 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 22:23:57,968 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-26 22:23:57,969 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 22:23:57,969 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 22:23:57,973 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 22:23:57,974 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 10:23:57" (1/1) ... [2018-10-26 22:23:57,977 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49bb8d53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:57, skipping insertion in model container [2018-10-26 22:23:57,977 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 10:23:57" (1/1) ... [2018-10-26 22:23:57,988 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 22:23:58,008 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 22:23:58,180 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 22:23:58,185 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 22:23:58,204 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 22:23:58,222 INFO L193 MainTranslator]: Completed translation [2018-10-26 22:23:58,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58 WrapperNode [2018-10-26 22:23:58,223 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 22:23:58,224 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 22:23:58,224 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 22:23:58,224 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 22:23:58,235 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,241 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,262 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 22:23:58,264 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 22:23:58,264 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 22:23:58,264 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 22:23:58,275 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,275 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,275 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,276 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,282 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,283 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (1/1) ... [2018-10-26 22:23:58,284 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 22:23:58,284 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 22:23:58,284 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 22:23:58,285 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 22:23:58,286 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (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 [2018-10-26 22:23:58,406 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 22:23:58,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 22:23:58,580 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 22:23:58,581 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 10:23:58 BoogieIcfgContainer [2018-10-26 22:23:58,581 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 22:23:58,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 22:23:58,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 22:23:58,586 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 22:23:58,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 10:23:57" (1/3) ... [2018-10-26 22:23:58,587 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d766f26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 10:23:58, skipping insertion in model container [2018-10-26 22:23:58,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 10:23:58" (2/3) ... [2018-10-26 22:23:58,588 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d766f26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 10:23:58, skipping insertion in model container [2018-10-26 22:23:58,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 10:23:58" (3/3) ... [2018-10-26 22:23:58,590 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-10-26 22:23:58,600 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 22:23:58,608 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 22:23:58,626 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 22:23:58,660 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-26 22:23:58,661 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 22:23:58,661 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 22:23:58,661 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 22:23:58,661 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 22:23:58,662 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 22:23:58,662 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 22:23:58,662 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 22:23:58,662 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 22:23:58,678 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-26 22:23:58,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-26 22:23:58,685 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:23:58,686 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-26 22:23:58,688 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:23:58,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:23:58,693 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-26 22:23:58,695 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:23:58,695 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:23:58,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:58,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:23:58,747 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:58,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:23:58,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:58,812 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 22:23:58,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-26 22:23:58,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-26 22:23:58,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-26 22:23:58,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-26 22:23:58,836 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-26 22:23:58,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:23:58,854 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-26 22:23:58,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-26 22:23:58,855 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-26 22:23:58,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:23:58,865 INFO L225 Difference]: With dead ends: 20 [2018-10-26 22:23:58,865 INFO L226 Difference]: Without dead ends: 8 [2018-10-26 22:23:58,872 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 [2018-10-26 22:23:58,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-26 22:23:58,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-26 22:23:58,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-26 22:23:58,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-26 22:23:58,908 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-26 22:23:58,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:23:58,909 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-26 22:23:58,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-26 22:23:58,909 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-26 22:23:58,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-26 22:23:58,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:23:58,910 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-26 22:23:58,910 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:23:58,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:23:58,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-26 22:23:58,911 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:23:58,911 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:23:58,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:58,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:23:58,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:58,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:23:59,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:59,050 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 22:23:59,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-26 22:23:59,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-26 22:23:59,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-26 22:23:59,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-26 22:23:59,059 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-26 22:23:59,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:23:59,125 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-26 22:23:59,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-26 22:23:59,133 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-26 22:23:59,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:23:59,134 INFO L225 Difference]: With dead ends: 14 [2018-10-26 22:23:59,134 INFO L226 Difference]: Without dead ends: 10 [2018-10-26 22:23:59,135 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 [2018-10-26 22:23:59,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-26 22:23:59,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-26 22:23:59,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-26 22:23:59,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-26 22:23:59,139 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-26 22:23:59,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:23:59,139 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-26 22:23:59,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-26 22:23:59,139 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-26 22:23:59,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-26 22:23:59,140 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:23:59,140 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 22:23:59,140 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:23:59,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:23:59,144 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-26 22:23:59,144 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:23:59,144 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:23:59,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:23:59,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:23:59,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:59,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:23:59,287 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 [2018-10-26 22:23:59,306 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:23:59,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:23:59,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:23:59,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:59,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:23:59,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-26 22:23:59,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-26 22:23:59,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-26 22:23:59,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-26 22:23:59,383 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-26 22:23:59,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:23:59,435 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-26 22:23:59,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-26 22:23:59,436 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-26 22:23:59,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:23:59,437 INFO L225 Difference]: With dead ends: 16 [2018-10-26 22:23:59,437 INFO L226 Difference]: Without dead ends: 12 [2018-10-26 22:23:59,438 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 [2018-10-26 22:23:59,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-26 22:23:59,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-26 22:23:59,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-26 22:23:59,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-26 22:23:59,441 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-26 22:23:59,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:23:59,442 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-26 22:23:59,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-26 22:23:59,442 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-26 22:23:59,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-26 22:23:59,443 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:23:59,443 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-26 22:23:59,443 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:23:59,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:23:59,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-26 22:23:59,444 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:23:59,444 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:23:59,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:23:59,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:23:59,607 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:59,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:23:59,607 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 [2018-10-26 22:23:59,618 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-26 22:23:59,637 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-26 22:23:59,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:23:59,639 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:23:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:23:59,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:23:59,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-26 22:23:59,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 22:23:59,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 22:23:59,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 22:23:59,688 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-26 22:23:59,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:23:59,835 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-26 22:23:59,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 22:23:59,835 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-26 22:23:59,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:23:59,836 INFO L225 Difference]: With dead ends: 18 [2018-10-26 22:23:59,836 INFO L226 Difference]: Without dead ends: 14 [2018-10-26 22:23:59,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 22:23:59,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-26 22:23:59,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-26 22:23:59,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-26 22:23:59,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-26 22:23:59,840 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-26 22:23:59,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:23:59,840 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-26 22:23:59,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 22:23:59,841 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-26 22:23:59,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-26 22:23:59,841 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:23:59,841 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-26 22:23:59,842 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:23:59,842 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:23:59,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-26 22:23:59,842 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:23:59,842 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:23:59,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:23:59,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:23:59,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:00,089 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:00,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:00,090 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 [2018-10-26 22:24:00,098 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 22:24:00,130 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-26 22:24:00,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:00,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:00,149 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:00,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:00,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-26 22:24:00,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 22:24:00,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 22:24:00,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-26 22:24:00,171 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-26 22:24:00,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:00,224 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-26 22:24:00,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 22:24:00,225 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-26 22:24:00,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:00,226 INFO L225 Difference]: With dead ends: 20 [2018-10-26 22:24:00,226 INFO L226 Difference]: Without dead ends: 16 [2018-10-26 22:24:00,227 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 [2018-10-26 22:24:00,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-26 22:24:00,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-26 22:24:00,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-26 22:24:00,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-26 22:24:00,230 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-26 22:24:00,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:00,231 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-26 22:24:00,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 22:24:00,231 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-26 22:24:00,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-26 22:24:00,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:00,232 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:00,232 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:00,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:00,233 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-26 22:24:00,233 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:00,233 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:00,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:00,234 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:00,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:00,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:00,399 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:00,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:00,399 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 [2018-10-26 22:24:00,411 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 22:24:00,449 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 22:24:00,449 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:00,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:00,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:00,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-26 22:24:00,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 22:24:00,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 22:24:00,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-26 22:24:00,540 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-26 22:24:00,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:00,605 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-26 22:24:00,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 22:24:00,606 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-26 22:24:00,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:00,607 INFO L225 Difference]: With dead ends: 22 [2018-10-26 22:24:00,607 INFO L226 Difference]: Without dead ends: 18 [2018-10-26 22:24:00,608 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 [2018-10-26 22:24:00,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-26 22:24:00,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-26 22:24:00,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-26 22:24:00,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-26 22:24:00,612 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-26 22:24:00,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:00,612 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-26 22:24:00,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 22:24:00,613 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-26 22:24:00,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-26 22:24:00,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:00,614 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:00,614 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:00,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:00,614 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-26 22:24:00,614 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:00,615 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:00,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:00,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:00,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:00,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:00,857 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:00,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:00,858 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 [2018-10-26 22:24:00,874 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-26 22:24:00,990 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-26 22:24:00,991 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:00,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:01,044 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:01,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:01,073 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-26 22:24:01,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-26 22:24:01,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-26 22:24:01,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-26 22:24:01,074 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-26 22:24:01,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:01,471 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-26 22:24:01,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-26 22:24:01,475 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-26 22:24:01,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:01,476 INFO L225 Difference]: With dead ends: 24 [2018-10-26 22:24:01,476 INFO L226 Difference]: Without dead ends: 20 [2018-10-26 22:24:01,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-26 22:24:01,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-26 22:24:01,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-26 22:24:01,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-26 22:24:01,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-26 22:24:01,487 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-26 22:24:01,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:01,487 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-26 22:24:01,487 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-26 22:24:01,487 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-26 22:24:01,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 22:24:01,488 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:01,488 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:01,489 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:01,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:01,491 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-26 22:24:01,491 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:01,492 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:01,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:01,493 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:01,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:01,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:01,730 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:01,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:01,730 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 [2018-10-26 22:24:01,738 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-26 22:24:01,762 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-26 22:24:01,762 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:01,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:01,778 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:01,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:01,799 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-26 22:24:01,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 22:24:01,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 22:24:01,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-26 22:24:01,801 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-26 22:24:01,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:01,927 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-26 22:24:01,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 22:24:01,928 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-26 22:24:01,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:01,930 INFO L225 Difference]: With dead ends: 26 [2018-10-26 22:24:01,930 INFO L226 Difference]: Without dead ends: 22 [2018-10-26 22:24:01,931 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 [2018-10-26 22:24:01,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-26 22:24:01,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-26 22:24:01,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-26 22:24:01,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-26 22:24:01,935 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-26 22:24:01,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:01,935 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-26 22:24:01,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 22:24:01,936 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-26 22:24:01,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-26 22:24:01,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:01,936 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:01,937 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:01,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:01,937 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-26 22:24:01,937 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:01,937 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:01,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:01,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:01,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:01,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:02,350 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:02,350 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:02,350 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 [2018-10-26 22:24:02,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:24:02,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:02,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:02,397 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:02,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:02,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-26 22:24:02,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-26 22:24:02,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-26 22:24:02,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-26 22:24:02,420 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-26 22:24:02,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:02,559 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-26 22:24:02,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-26 22:24:02,560 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-26 22:24:02,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:02,561 INFO L225 Difference]: With dead ends: 28 [2018-10-26 22:24:02,561 INFO L226 Difference]: Without dead ends: 24 [2018-10-26 22:24:02,562 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-26 22:24:02,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-26 22:24:02,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-26 22:24:02,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-26 22:24:02,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-26 22:24:02,566 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-26 22:24:02,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:02,566 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-26 22:24:02,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-26 22:24:02,567 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-26 22:24:02,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-26 22:24:02,567 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:02,568 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:02,568 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:02,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:02,568 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-26 22:24:02,569 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:02,569 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:02,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:02,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:24:02,570 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:02,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:02,904 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:02,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:02,905 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 [2018-10-26 22:24:02,915 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-26 22:24:02,942 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-26 22:24:02,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:02,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:02,954 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:02,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:02,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-26 22:24:02,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-26 22:24:02,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-26 22:24:02,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-26 22:24:02,976 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-26 22:24:03,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:03,082 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-26 22:24:03,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 22:24:03,083 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-26 22:24:03,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:03,084 INFO L225 Difference]: With dead ends: 30 [2018-10-26 22:24:03,084 INFO L226 Difference]: Without dead ends: 26 [2018-10-26 22:24:03,085 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-26 22:24:03,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-26 22:24:03,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-26 22:24:03,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-26 22:24:03,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-26 22:24:03,090 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-26 22:24:03,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:03,090 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-26 22:24:03,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-26 22:24:03,091 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-26 22:24:03,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-26 22:24:03,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:03,091 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:03,092 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:03,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:03,092 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-26 22:24:03,092 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:03,092 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:03,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:03,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:03,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:03,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:03,329 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:03,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:03,329 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 [2018-10-26 22:24:03,339 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 22:24:10,339 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-26 22:24:10,340 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:10,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:10,384 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:10,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:10,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-26 22:24:10,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-26 22:24:10,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-26 22:24:10,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-26 22:24:10,406 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-26 22:24:10,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:10,548 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-26 22:24:10,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-26 22:24:10,549 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-26 22:24:10,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:10,550 INFO L225 Difference]: With dead ends: 32 [2018-10-26 22:24:10,550 INFO L226 Difference]: Without dead ends: 28 [2018-10-26 22:24:10,551 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-26 22:24:10,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-26 22:24:10,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-26 22:24:10,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-26 22:24:10,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-26 22:24:10,556 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-26 22:24:10,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:10,557 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-26 22:24:10,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-26 22:24:10,557 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-26 22:24:10,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-26 22:24:10,558 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:10,558 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:10,558 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:10,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:10,559 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-26 22:24:10,559 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:10,559 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:10,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:10,560 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:10,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:10,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:10,792 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:10,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:10,793 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 [2018-10-26 22:24:10,808 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 22:24:10,831 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 22:24:10,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:24:10,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:24:10,859 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:10,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:24:10,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-26 22:24:10,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-26 22:24:10,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-26 22:24:10,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-26 22:24:10,881 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-26 22:24:11,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:24:11,214 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-26 22:24:11,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-26 22:24:11,215 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-26 22:24:11,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:24:11,216 INFO L225 Difference]: With dead ends: 34 [2018-10-26 22:24:11,216 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 22:24:11,217 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-26 22:24:11,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 22:24:11,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-26 22:24:11,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 22:24:11,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-26 22:24:11,221 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-26 22:24:11,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:24:11,222 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-26 22:24:11,222 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-26 22:24:11,222 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-26 22:24:11,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-26 22:24:11,223 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:24:11,223 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-26 22:24:11,223 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:24:11,224 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:24:11,224 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-26 22:24:11,224 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:24:11,224 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:24:11,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:11,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:24:11,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:24:11,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:24:11,826 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:24:11,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:24:11,826 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 [2018-10-26 22:24:11,834 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-26 22:25:16,317 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-26 22:25:16,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:25:16,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:16,494 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:16,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:16,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-26 22:25:16,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-26 22:25:16,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-26 22:25:16,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-26 22:25:16,501 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-26 22:25:16,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:16,665 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-26 22:25:16,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-26 22:25:16,665 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-26 22:25:16,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:16,667 INFO L225 Difference]: With dead ends: 36 [2018-10-26 22:25:16,667 INFO L226 Difference]: Without dead ends: 32 [2018-10-26 22:25:16,668 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-26 22:25:16,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-26 22:25:16,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-26 22:25:16,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-26 22:25:16,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-26 22:25:16,673 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-26 22:25:16,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:16,674 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-26 22:25:16,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-26 22:25:16,674 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-26 22:25:16,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 22:25:16,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:16,675 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:16,675 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:16,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:16,676 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-26 22:25:16,676 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:16,676 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:16,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:16,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:25:16,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:16,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:16,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:16,938 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 [2018-10-26 22:25:16,951 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-26 22:25:27,109 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-26 22:25:27,109 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:25:27,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:27,136 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:27,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:27,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-26 22:25:27,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 22:25:27,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 22:25:27,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-26 22:25:27,159 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-26 22:25:27,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:27,392 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-26 22:25:27,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 22:25:27,393 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-26 22:25:27,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:27,394 INFO L225 Difference]: With dead ends: 38 [2018-10-26 22:25:27,394 INFO L226 Difference]: Without dead ends: 34 [2018-10-26 22:25:27,395 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 [2018-10-26 22:25:27,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-26 22:25:27,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-26 22:25:27,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-26 22:25:27,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-26 22:25:27,400 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-26 22:25:27,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:27,401 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-26 22:25:27,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 22:25:27,401 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-26 22:25:27,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-26 22:25:27,402 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:27,402 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:27,402 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:27,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:27,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-26 22:25:27,403 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:27,403 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:27,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:27,404 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:25:27,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:27,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:28,005 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:28,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:28,006 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 [2018-10-26 22:25:28,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:25:28,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:28,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:28,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:28,069 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-26 22:25:28,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-26 22:25:28,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-26 22:25:28,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-26 22:25:28,070 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-26 22:25:28,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:28,453 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-26 22:25:28,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-26 22:25:28,453 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-26 22:25:28,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:28,454 INFO L225 Difference]: With dead ends: 40 [2018-10-26 22:25:28,454 INFO L226 Difference]: Without dead ends: 36 [2018-10-26 22:25:28,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-26 22:25:28,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-26 22:25:28,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-26 22:25:28,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-26 22:25:28,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-26 22:25:28,460 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-26 22:25:28,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:28,460 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-26 22:25:28,461 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-26 22:25:28,461 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-26 22:25:28,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-26 22:25:28,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:28,462 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:28,462 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:28,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:28,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-26 22:25:28,463 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:28,463 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:28,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 22:25:28,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:28,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:28,803 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:28,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:28,804 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 [2018-10-26 22:25:28,813 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-26 22:25:28,852 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-26 22:25:28,852 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:25:28,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:28,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:28,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-26 22:25:28,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-26 22:25:28,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-26 22:25:28,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-26 22:25:28,967 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-26 22:25:29,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:29,319 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-26 22:25:29,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-26 22:25:29,325 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-26 22:25:29,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:29,325 INFO L225 Difference]: With dead ends: 42 [2018-10-26 22:25:29,325 INFO L226 Difference]: Without dead ends: 38 [2018-10-26 22:25:29,326 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 [2018-10-26 22:25:29,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-26 22:25:29,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-26 22:25:29,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-26 22:25:29,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-26 22:25:29,330 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-26 22:25:29,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:29,330 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-26 22:25:29,330 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-26 22:25:29,330 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-26 22:25:29,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-26 22:25:29,331 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:29,331 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:29,332 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:29,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:29,332 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-26 22:25:29,332 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:29,332 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:29,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:29,333 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:25:29,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:29,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:29,772 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:29,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:29,772 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-26 22:25:29,780 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 22:25:45,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-26 22:25:45,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:25:45,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:45,167 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:45,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:45,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-26 22:25:45,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-26 22:25:45,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-26 22:25:45,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-26 22:25:45,199 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-26 22:25:45,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:45,657 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-26 22:25:45,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-26 22:25:45,657 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-26 22:25:45,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:45,658 INFO L225 Difference]: With dead ends: 44 [2018-10-26 22:25:45,658 INFO L226 Difference]: Without dead ends: 40 [2018-10-26 22:25:45,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-26 22:25:45,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-26 22:25:45,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-26 22:25:45,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-26 22:25:45,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-26 22:25:45,664 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-26 22:25:45,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:45,665 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-26 22:25:45,665 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-26 22:25:45,665 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-26 22:25:45,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-26 22:25:45,666 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:45,666 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:45,666 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:45,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:45,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-26 22:25:45,666 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:45,667 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:45,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:45,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:25:45,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:45,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:46,031 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:46,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:46,032 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 [2018-10-26 22:25:46,040 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 22:25:46,069 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 22:25:46,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:25:46,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:25:46,152 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:46,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:25:46,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-26 22:25:46,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-26 22:25:46,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-26 22:25:46,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-26 22:25:46,183 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-26 22:25:46,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:25:46,492 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-26 22:25:46,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 22:25:46,492 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-26 22:25:46,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:25:46,493 INFO L225 Difference]: With dead ends: 46 [2018-10-26 22:25:46,493 INFO L226 Difference]: Without dead ends: 42 [2018-10-26 22:25:46,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-26 22:25:46,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-26 22:25:46,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-26 22:25:46,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-26 22:25:46,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-26 22:25:46,500 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-26 22:25:46,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:25:46,500 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-26 22:25:46,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-26 22:25:46,500 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-26 22:25:46,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-26 22:25:46,501 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:25:46,501 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-26 22:25:46,501 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:25:46,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:25:46,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-26 22:25:46,502 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:25:46,502 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:25:46,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:46,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:25:46,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:25:46,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:25:47,287 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:25:47,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:25:47,288 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 [2018-10-26 22:25:47,295 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-26 22:28:41,059 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-26 22:28:41,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 22:28:41,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 22:28:41,203 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:28:41,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-26 22:28:41,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-26 22:28:41,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-26 22:28:41,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-26 22:28:41,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-26 22:28:41,208 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 20 states. [2018-10-26 22:28:41,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 22:28:41,892 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-26 22:28:41,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-26 22:28:41,892 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2018-10-26 22:28:41,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 22:28:41,893 INFO L225 Difference]: With dead ends: 48 [2018-10-26 22:28:41,893 INFO L226 Difference]: Without dead ends: 44 [2018-10-26 22:28:41,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-26 22:28:41,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-26 22:28:41,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-26 22:28:41,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-26 22:28:41,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-26 22:28:41,898 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-26 22:28:41,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 22:28:41,898 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-26 22:28:41,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-26 22:28:41,898 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-26 22:28:41,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-26 22:28:41,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 22:28:41,899 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1] [2018-10-26 22:28:41,899 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 22:28:41,899 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 22:28:41,900 INFO L82 PathProgramCache]: Analyzing trace with hash 242204127, now seen corresponding path program 18 times [2018-10-26 22:28:41,900 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-26 22:28:41,900 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-26 22:28:41,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:28:41,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 22:28:41,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 22:28:41,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 22:28:42,432 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 22:28:42,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 22:28:42,433 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-26 22:28:42,443 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown