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/functions_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 09:29:36,158 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 09:29:36,161 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 09:29:36,180 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 09:29:36,181 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 09:29:36,182 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 09:29:36,184 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 09:29:36,186 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 09:29:36,188 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 09:29:36,189 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 09:29:36,198 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 09:29:36,198 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 09:29:36,199 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 09:29:36,200 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 09:29:36,203 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 09:29:36,204 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 09:29:36,205 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 09:29:36,209 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 09:29:36,213 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 09:29:36,215 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 09:29:36,216 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 09:29:36,219 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 09:29:36,222 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-23 09:29:36,235 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 [2018-10-23 09:29:36,262 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 09:29:36,263 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 09:29:36,263 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 09:29:36,264 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-23 09:29:36,264 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-23 09:29:36,264 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-23 09:29:36,265 INFO L133 SettingsManager]: * Use SBE=true [2018-10-23 09:29:36,266 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 09:29:36,266 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 09:29:36,266 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 09:29:36,266 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 09:29:36,266 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 09:29:36,267 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 09:29:36,267 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 09:29:36,267 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 09:29:36,267 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 09:29:36,267 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 09:29:36,267 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 09:29:36,268 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 09:29:36,268 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 09:29:36,268 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 09:29:36,268 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 09:29:36,268 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 09:29:36,269 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-23 09:29:36,269 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 09:29:36,269 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 09:29:36,269 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 09:29:36,269 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 09:29:36,323 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 09:29:36,338 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 09:29:36,341 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 09:29:36,343 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 09:29:36,343 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 09:29:36,344 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-23 09:29:36,403 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/55ef686fd/bf1ffa5591e04937b7b0c25bd780e8f1/FLAG5c01e27d7 [2018-10-23 09:29:36,869 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 09:29:36,870 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_false-unreach-call1_true-termination.i [2018-10-23 09:29:36,878 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/55ef686fd/bf1ffa5591e04937b7b0c25bd780e8f1/FLAG5c01e27d7 [2018-10-23 09:29:36,902 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/55ef686fd/bf1ffa5591e04937b7b0c25bd780e8f1 [2018-10-23 09:29:36,915 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 09:29:36,917 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 09:29:36,920 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 09:29:36,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 09:29:36,926 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 09:29:36,927 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:29:36" (1/1) ... [2018-10-23 09:29:36,930 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ba5896a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:36, skipping insertion in model container [2018-10-23 09:29:36,931 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:29:36" (1/1) ... [2018-10-23 09:29:36,942 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 09:29:36,969 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 09:29:37,151 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:29:37,155 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 09:29:37,172 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:29:37,186 INFO L193 MainTranslator]: Completed translation [2018-10-23 09:29:37,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37 WrapperNode [2018-10-23 09:29:37,187 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 09:29:37,188 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 09:29:37,188 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 09:29:37,188 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 09:29:37,198 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,204 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,223 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 09:29:37,223 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 09:29:37,223 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 09:29:37,223 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 09:29:37,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,233 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,234 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,239 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,240 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (1/1) ... [2018-10-23 09:29:37,242 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 09:29:37,243 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 09:29:37,243 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 09:29:37,243 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 09:29:37,244 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (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 [2018-10-23 09:29:37,372 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 09:29:37,373 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 09:29:37,690 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 09:29:37,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:29:37 BoogieIcfgContainer [2018-10-23 09:29:37,690 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 09:29:37,691 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 09:29:37,691 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 09:29:37,695 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 09:29:37,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:29:36" (1/3) ... [2018-10-23 09:29:37,696 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5abddb72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:29:37, skipping insertion in model container [2018-10-23 09:29:37,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:29:37" (2/3) ... [2018-10-23 09:29:37,696 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5abddb72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:29:37, skipping insertion in model container [2018-10-23 09:29:37,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:29:37" (3/3) ... [2018-10-23 09:29:37,698 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_false-unreach-call1_true-termination.i [2018-10-23 09:29:37,707 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 09:29:37,715 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 09:29:37,732 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 09:29:37,767 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-23 09:29:37,767 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 09:29:37,768 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 09:29:37,768 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 09:29:37,768 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 09:29:37,768 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 09:29:37,768 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 09:29:37,768 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 09:29:37,768 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 09:29:37,783 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-23 09:29:37,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-23 09:29:37,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:37,790 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-23 09:29:37,792 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:37,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:37,799 INFO L82 PathProgramCache]: Analyzing trace with hash 889845351, now seen corresponding path program 1 times [2018-10-23 09:29:37,800 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:37,801 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:37,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:37,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:37,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:37,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:37,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:37,902 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:29:37,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 09:29:37,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 09:29:37,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 09:29:37,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 09:29:37,921 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-23 09:29:37,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:37,937 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-10-23 09:29:37,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 09:29:37,939 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-23 09:29:37,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:37,949 INFO L225 Difference]: With dead ends: 21 [2018-10-23 09:29:37,949 INFO L226 Difference]: Without dead ends: 9 [2018-10-23 09:29:37,953 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 [2018-10-23 09:29:37,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-23 09:29:37,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-23 09:29:37,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-23 09:29:37,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-23 09:29:37,991 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-23 09:29:37,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:37,991 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-23 09:29:37,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 09:29:37,992 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-23 09:29:37,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-23 09:29:37,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:37,992 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:37,993 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:37,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:37,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1805925645, now seen corresponding path program 1 times [2018-10-23 09:29:37,993 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:37,993 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:37,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:37,995 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:37,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:38,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:38,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:38,130 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:29:38,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 09:29:38,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 09:29:38,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 09:29:38,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:29:38,134 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 3 states. [2018-10-23 09:29:38,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:38,207 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-23 09:29:38,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 09:29:38,208 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-23 09:29:38,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:38,208 INFO L225 Difference]: With dead ends: 16 [2018-10-23 09:29:38,208 INFO L226 Difference]: Without dead ends: 12 [2018-10-23 09:29:38,210 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 [2018-10-23 09:29:38,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-23 09:29:38,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2018-10-23 09:29:38,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-23 09:29:38,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-23 09:29:38,214 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 7 [2018-10-23 09:29:38,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:38,214 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-23 09:29:38,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 09:29:38,215 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-23 09:29:38,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 09:29:38,215 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:38,216 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:38,216 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:38,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:38,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1078158165, now seen corresponding path program 1 times [2018-10-23 09:29:38,217 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:38,217 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:38,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:38,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:38,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:38,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:38,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:38,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:38,395 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 [2018-10-23 09:29:38,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:38,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:38,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:38,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:38,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:38,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-23 09:29:38,520 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 09:29:38,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 09:29:38,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 09:29:38,521 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 5 states. [2018-10-23 09:29:38,738 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-23 09:29:38,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:38,915 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-23 09:29:38,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 09:29:38,917 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-10-23 09:29:38,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:38,918 INFO L225 Difference]: With dead ends: 19 [2018-10-23 09:29:38,918 INFO L226 Difference]: Without dead ends: 15 [2018-10-23 09:29:38,919 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:29:38,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-23 09:29:38,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2018-10-23 09:29:38,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-23 09:29:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-23 09:29:38,925 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 10 [2018-10-23 09:29:38,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:38,925 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-23 09:29:38,925 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 09:29:38,926 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-23 09:29:38,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-23 09:29:38,926 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:38,926 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:38,927 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:38,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:38,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1814605, now seen corresponding path program 2 times [2018-10-23 09:29:38,928 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:38,928 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:38,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:38,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:38,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:38,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:39,388 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:39,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:39,389 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 [2018-10-23 09:29:39,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:29:39,424 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:29:39,424 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:39,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:39,450 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:39,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:39,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-23 09:29:39,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 09:29:39,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 09:29:39,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:29:39,474 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2018-10-23 09:29:39,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:39,695 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-23 09:29:39,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 09:29:39,695 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-10-23 09:29:39,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:39,696 INFO L225 Difference]: With dead ends: 22 [2018-10-23 09:29:39,696 INFO L226 Difference]: Without dead ends: 18 [2018-10-23 09:29:39,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:29:39,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-23 09:29:39,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-23 09:29:39,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-23 09:29:39,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-23 09:29:39,702 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-23 09:29:39,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:39,702 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-23 09:29:39,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 09:29:39,702 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-23 09:29:39,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-23 09:29:39,703 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:39,703 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:39,704 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:39,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:39,704 INFO L82 PathProgramCache]: Analyzing trace with hash -129408661, now seen corresponding path program 3 times [2018-10-23 09:29:39,704 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:39,705 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:39,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:39,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:39,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:39,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:39,978 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:39,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:39,980 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 [2018-10-23 09:29:39,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:29:40,060 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-23 09:29:40,060 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:40,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:40,083 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:40,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:40,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-23 09:29:40,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 09:29:40,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 09:29:40,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-23 09:29:40,106 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-23 09:29:40,433 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-23 09:29:40,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:40,706 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-23 09:29:40,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 09:29:40,706 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-23 09:29:40,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:40,707 INFO L225 Difference]: With dead ends: 25 [2018-10-23 09:29:40,707 INFO L226 Difference]: Without dead ends: 21 [2018-10-23 09:29:40,708 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:29:40,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-23 09:29:40,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-23 09:29:40,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-23 09:29:40,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-23 09:29:40,713 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-23 09:29:40,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:40,713 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-23 09:29:40,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 09:29:40,714 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-23 09:29:40,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-23 09:29:40,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:40,714 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:40,715 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:40,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:40,715 INFO L82 PathProgramCache]: Analyzing trace with hash -981486707, now seen corresponding path program 4 times [2018-10-23 09:29:40,715 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:40,716 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:40,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:40,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:40,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:40,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:41,063 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:41,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:41,064 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 [2018-10-23 09:29:41,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:29:41,123 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:29:41,123 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:41,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:41,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:41,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-23 09:29:41,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 09:29:41,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 09:29:41,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:29:41,177 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2018-10-23 09:29:41,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:41,554 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-23 09:29:41,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 09:29:41,558 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2018-10-23 09:29:41,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:41,558 INFO L225 Difference]: With dead ends: 28 [2018-10-23 09:29:41,558 INFO L226 Difference]: Without dead ends: 24 [2018-10-23 09:29:41,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:29:41,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-23 09:29:41,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-23 09:29:41,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-23 09:29:41,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-23 09:29:41,564 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-23 09:29:41,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:41,564 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-23 09:29:41,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 09:29:41,565 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-23 09:29:41,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-23 09:29:41,566 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:41,566 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:41,566 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:41,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:41,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1981835733, now seen corresponding path program 5 times [2018-10-23 09:29:41,567 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:41,567 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:41,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:41,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:41,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:41,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:41,996 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:41,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:41,997 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 [2018-10-23 09:29:42,005 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 09:29:42,042 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-23 09:29:42,042 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:42,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:42,059 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:42,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:42,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-23 09:29:42,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 09:29:42,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 09:29:42,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-23 09:29:42,081 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 13 states. [2018-10-23 09:29:42,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:42,487 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-23 09:29:42,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 09:29:42,488 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 22 [2018-10-23 09:29:42,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:42,489 INFO L225 Difference]: With dead ends: 31 [2018-10-23 09:29:42,489 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 09:29:42,490 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2018-10-23 09:29:42,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 09:29:42,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-23 09:29:42,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-23 09:29:42,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-23 09:29:42,497 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-23 09:29:42,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:42,497 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-23 09:29:42,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 09:29:42,497 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-23 09:29:42,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-23 09:29:42,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:42,498 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:42,498 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:42,499 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:42,499 INFO L82 PathProgramCache]: Analyzing trace with hash -601602355, now seen corresponding path program 6 times [2018-10-23 09:29:42,499 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:42,499 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:42,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:42,500 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:42,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:42,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:42,929 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:42,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:42,929 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 [2018-10-23 09:29:42,937 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 09:29:42,974 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-23 09:29:42,974 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:42,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:43,001 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:43,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:43,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-23 09:29:43,023 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 09:29:43,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 09:29:43,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:29:43,024 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 15 states. [2018-10-23 09:29:43,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:43,415 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-23 09:29:43,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 09:29:43,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2018-10-23 09:29:43,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:43,417 INFO L225 Difference]: With dead ends: 34 [2018-10-23 09:29:43,418 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 09:29:43,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2018-10-23 09:29:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 09:29:43,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-23 09:29:43,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 09:29:43,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-23 09:29:43,425 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-23 09:29:43,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:43,425 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-23 09:29:43,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 09:29:43,426 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-23 09:29:43,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-23 09:29:43,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:43,427 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:43,427 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:43,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:43,427 INFO L82 PathProgramCache]: Analyzing trace with hash -2085930261, now seen corresponding path program 7 times [2018-10-23 09:29:43,427 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:43,427 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:43,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:43,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:43,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:43,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:44,093 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:44,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:44,094 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 [2018-10-23 09:29:44,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:44,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:44,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:44,160 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:44,181 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:44,181 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-23 09:29:44,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 09:29:44,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 09:29:44,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-23 09:29:44,182 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 17 states. [2018-10-23 09:29:44,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:44,849 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-23 09:29:44,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 09:29:44,852 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2018-10-23 09:29:44,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:44,853 INFO L225 Difference]: With dead ends: 37 [2018-10-23 09:29:44,853 INFO L226 Difference]: Without dead ends: 33 [2018-10-23 09:29:44,854 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2018-10-23 09:29:44,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-23 09:29:44,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-23 09:29:44,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-23 09:29:44,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-23 09:29:44,859 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-23 09:29:44,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:44,860 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-23 09:29:44,860 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 09:29:44,860 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-23 09:29:44,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-23 09:29:44,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:44,862 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:44,862 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:44,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:44,863 INFO L82 PathProgramCache]: Analyzing trace with hash -715298291, now seen corresponding path program 8 times [2018-10-23 09:29:44,863 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:44,863 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:44,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:44,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:29:44,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:44,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:45,197 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:45,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:45,198 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 [2018-10-23 09:29:45,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:29:45,253 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:29:45,253 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:45,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:45,309 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:45,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:45,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-23 09:29:45,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 09:29:45,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 09:29:45,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:29:45,332 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 19 states. [2018-10-23 09:29:46,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:46,035 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-23 09:29:46,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 09:29:46,037 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 31 [2018-10-23 09:29:46,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:46,038 INFO L225 Difference]: With dead ends: 40 [2018-10-23 09:29:46,038 INFO L226 Difference]: Without dead ends: 36 [2018-10-23 09:29:46,040 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 09:29:46,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-23 09:29:46,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-23 09:29:46,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-23 09:29:46,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-23 09:29:46,046 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-23 09:29:46,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:46,047 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-23 09:29:46,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 09:29:46,047 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-23 09:29:46,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-23 09:29:46,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:46,048 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:46,049 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:46,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:46,049 INFO L82 PathProgramCache]: Analyzing trace with hash -472363093, now seen corresponding path program 9 times [2018-10-23 09:29:46,049 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:46,049 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:46,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:46,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:46,051 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:46,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:46,504 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:46,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:46,504 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 [2018-10-23 09:29:46,512 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:29:46,820 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-23 09:29:46,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:46,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:46,851 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:46,872 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:46,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-23 09:29:46,873 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 09:29:46,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 09:29:46,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-23 09:29:46,874 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 21 states. [2018-10-23 09:29:47,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:47,480 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-23 09:29:47,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 09:29:47,480 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 34 [2018-10-23 09:29:47,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:47,482 INFO L225 Difference]: With dead ends: 43 [2018-10-23 09:29:47,482 INFO L226 Difference]: Without dead ends: 39 [2018-10-23 09:29:47,483 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 09:29:47,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-23 09:29:47,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-23 09:29:47,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-23 09:29:47,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-23 09:29:47,489 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-23 09:29:47,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:47,490 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-23 09:29:47,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 09:29:47,490 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-23 09:29:47,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-23 09:29:47,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:47,491 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:47,491 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:47,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:47,492 INFO L82 PathProgramCache]: Analyzing trace with hash -209773235, now seen corresponding path program 10 times [2018-10-23 09:29:47,492 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:47,492 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:47,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:47,493 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:47,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:47,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:47,923 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:47,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:47,923 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 [2018-10-23 09:29:47,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:29:47,979 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:29:47,979 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:29:47,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:29:48,062 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:48,098 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:29:48,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-23 09:29:48,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 09:29:48,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 09:29:48,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-23 09:29:48,100 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 23 states. [2018-10-23 09:29:49,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:29:49,748 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-23 09:29:49,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 09:29:49,749 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 37 [2018-10-23 09:29:49,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:29:49,750 INFO L225 Difference]: With dead ends: 46 [2018-10-23 09:29:49,750 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 09:29:49,751 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 09:29:49,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 09:29:49,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-23 09:29:49,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-23 09:29:49,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-23 09:29:49,757 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-23 09:29:49,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:29:49,757 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-23 09:29:49,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 09:29:49,758 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-23 09:29:49,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-23 09:29:49,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:29:49,759 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1] [2018-10-23 09:29:49,759 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:29:49,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:29:49,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1469240427, now seen corresponding path program 11 times [2018-10-23 09:29:49,759 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:29:49,760 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:29:49,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:49,761 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:29:49,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:29:49,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:29:50,517 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:29:50,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:29:50,517 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 [2018-10-23 09:29:50,535 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-23 09:30:49,064 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-23 09:30:49,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:30:49,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:30:49,269 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:30:49,295 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:30:49,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-23 09:30:49,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 09:30:49,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 09:30:49,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-23 09:30:49,296 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 25 states. [2018-10-23 09:30:50,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:30:50,232 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-23 09:30:50,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-23 09:30:50,233 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 40 [2018-10-23 09:30:50,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:30:50,234 INFO L225 Difference]: With dead ends: 49 [2018-10-23 09:30:50,234 INFO L226 Difference]: Without dead ends: 45 [2018-10-23 09:30:50,235 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 09:30:50,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-23 09:30:50,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-23 09:30:50,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-23 09:30:50,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-23 09:30:50,240 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-23 09:30:50,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:30:50,240 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-23 09:30:50,240 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 09:30:50,240 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-23 09:30:50,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-23 09:30:50,241 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:30:50,241 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1] [2018-10-23 09:30:50,241 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:30:50,242 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:30:50,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1776115853, now seen corresponding path program 12 times [2018-10-23 09:30:50,242 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:30:50,242 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:30:50,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:30:50,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:30:50,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:30:50,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:30:50,797 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:30:50,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:30:50,797 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 [2018-10-23 09:30:50,808 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-23 09:31:43,723 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-23 09:31:43,723 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:31:43,754 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:31:43,826 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:43,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:31:43,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-10-23 09:31:43,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-23 09:31:43,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-23 09:31:43,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-10-23 09:31:43,848 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 27 states. [2018-10-23 09:31:45,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:31:45,329 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-23 09:31:45,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-23 09:31:45,338 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 43 [2018-10-23 09:31:45,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:31:45,339 INFO L225 Difference]: With dead ends: 52 [2018-10-23 09:31:45,339 INFO L226 Difference]: Without dead ends: 48 [2018-10-23 09:31:45,342 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 09:31:45,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-23 09:31:45,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-23 09:31:45,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-23 09:31:45,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-23 09:31:45,355 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-23 09:31:45,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:31:45,355 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-23 09:31:45,355 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-23 09:31:45,355 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-23 09:31:45,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-23 09:31:45,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:31:45,358 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1] [2018-10-23 09:31:45,359 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:31:45,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:31:45,359 INFO L82 PathProgramCache]: Analyzing trace with hash -83441365, now seen corresponding path program 13 times [2018-10-23 09:31:45,359 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:31:45,359 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:31:45,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:45,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:31:45,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:45,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:31:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:46,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:31:46,271 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 [2018-10-23 09:31:46,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:31:46,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:31:46,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:31:46,322 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:46,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:31:46,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-10-23 09:31:46,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-23 09:31:46,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-23 09:31:46,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-10-23 09:31:46,343 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 29 states. [2018-10-23 09:31:47,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:31:47,592 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-23 09:31:47,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-23 09:31:47,593 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 46 [2018-10-23 09:31:47,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:31:47,594 INFO L225 Difference]: With dead ends: 55 [2018-10-23 09:31:47,594 INFO L226 Difference]: Without dead ends: 51 [2018-10-23 09:31:47,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 09:31:47,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-23 09:31:47,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-23 09:31:47,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-23 09:31:47,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-23 09:31:47,603 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-23 09:31:47,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:31:47,603 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-23 09:31:47,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-23 09:31:47,604 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-23 09:31:47,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-23 09:31:47,604 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:31:47,605 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1] [2018-10-23 09:31:47,605 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:31:47,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:31:47,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1664338995, now seen corresponding path program 14 times [2018-10-23 09:31:47,605 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:31:47,605 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:31:47,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:47,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:31:47,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:47,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:31:48,173 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:48,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:31:48,174 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 [2018-10-23 09:31:48,182 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:31:48,209 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:31:48,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:31:48,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:31:48,241 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:48,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:31:48,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 31 [2018-10-23 09:31:48,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-23 09:31:48,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-23 09:31:48,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-10-23 09:31:48,269 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 31 states. [2018-10-23 09:31:49,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:31:49,438 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-23 09:31:49,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-23 09:31:49,439 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 49 [2018-10-23 09:31:49,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:31:49,440 INFO L225 Difference]: With dead ends: 58 [2018-10-23 09:31:49,440 INFO L226 Difference]: Without dead ends: 54 [2018-10-23 09:31:49,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=171, Invalid=3251, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 09:31:49,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-23 09:31:49,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-23 09:31:49,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-23 09:31:49,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-23 09:31:49,447 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-23 09:31:49,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:31:49,447 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-23 09:31:49,448 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-23 09:31:49,448 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-23 09:31:49,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-23 09:31:49,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:31:49,449 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1] [2018-10-23 09:31:49,449 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:31:49,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:31:49,449 INFO L82 PathProgramCache]: Analyzing trace with hash 425733611, now seen corresponding path program 15 times [2018-10-23 09:31:49,449 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:31:49,450 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:31:49,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:49,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:31:49,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:31:49,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:31:50,304 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:31:50,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:31:50,304 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 [2018-10-23 09:31:50,315 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-23 09:33:41,389 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-23 09:33:41,389 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:33:41,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:33:41,770 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:33:41,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:33:41,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 33 [2018-10-23 09:33:41,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-23 09:33:41,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-23 09:33:41,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 09:33:41,776 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 33 states. [2018-10-23 09:33:42,941 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-23 09:33:43,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:33:43,424 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-23 09:33:43,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-23 09:33:43,425 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 52 [2018-10-23 09:33:43,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:33:43,426 INFO L225 Difference]: With dead ends: 61 [2018-10-23 09:33:43,426 INFO L226 Difference]: Without dead ends: 57 [2018-10-23 09:33:43,428 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=183, Invalid=3723, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 09:33:43,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-23 09:33:43,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-23 09:33:43,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-23 09:33:43,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-23 09:33:43,435 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-23 09:33:43,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:33:43,435 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-23 09:33:43,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-23 09:33:43,436 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-23 09:33:43,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-23 09:33:43,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:33:43,439 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1] [2018-10-23 09:33:43,439 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:33:43,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:33:43,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1637848845, now seen corresponding path program 16 times [2018-10-23 09:33:43,440 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:33:43,440 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:33:43,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:33:43,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:33:43,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:33:43,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:33:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:33:44,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:33:44,797 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 [2018-10-23 09:33:44,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:33:44,831 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:33:44,831 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:33:44,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:33:44,888 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:33:44,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-23 09:33:44,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2018-10-23 09:33:44,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-23 09:33:44,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-23 09:33:44,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 09:33:44,912 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 35 states. [2018-10-23 09:33:46,119 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-23 09:33:46,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:33:46,652 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-10-23 09:33:46,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-23 09:33:46,653 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 55 [2018-10-23 09:33:46,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:33:46,653 INFO L225 Difference]: With dead ends: 64 [2018-10-23 09:33:46,654 INFO L226 Difference]: Without dead ends: 60 [2018-10-23 09:33:46,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=195, Invalid=4227, Unknown=0, NotChecked=0, Total=4422 [2018-10-23 09:33:46,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-23 09:33:46,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-23 09:33:46,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-23 09:33:46,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-23 09:33:46,660 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-23 09:33:46,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:33:46,660 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-23 09:33:46,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-23 09:33:46,661 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-23 09:33:46,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-23 09:33:46,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:33:46,662 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1] [2018-10-23 09:33:46,662 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:33:46,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:33:46,662 INFO L82 PathProgramCache]: Analyzing trace with hash -322239829, now seen corresponding path program 17 times [2018-10-23 09:33:46,662 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-23 09:33:46,662 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-23 09:33:46,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:33:46,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:33:46,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:33:46,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:33:47,431 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:33:47,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:33:47,431 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 [2018-10-23 09:33:47,438 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown