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/overflow_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:45:06,635 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:45:06,637 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:45:06,649 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:45:06,649 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:45:06,650 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:45:06,652 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:45:06,653 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:45:06,655 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:45:06,656 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:45:06,657 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:45:06,657 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:45:06,658 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:45:06,659 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:45:06,660 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:45:06,661 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:45:06,662 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:45:06,666 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:45:06,671 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:45:06,672 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:45:06,674 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:45:06,678 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:45:06,681 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:45:06,694 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 [2018-10-22 15:45:06,722 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:45:06,722 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:45:06,723 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:45:06,723 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-22 15:45:06,724 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-22 15:45:06,724 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-22 15:45:06,724 INFO L133 SettingsManager]: * Use SBE=true [2018-10-22 15:45:06,725 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:45:06,725 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:45:06,725 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:45:06,725 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:45:06,725 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:45:06,726 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:45:06,726 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:45:06,726 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:45:06,726 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:45:06,726 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:45:06,727 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:45:06,727 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:45:06,729 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:45:06,729 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:45:06,729 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:45:06,729 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:45:06,729 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-22 15:45:06,730 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:45:06,730 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:45:06,730 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:45:06,730 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:45:06,782 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:45:06,794 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:45:06,799 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:45:06,800 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:45:06,801 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:45:06,802 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-10-22 15:45:06,876 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f97972c89/c302f909c9774c44ae95e35ac71c6306/FLAGab50c33d9 [2018-10-22 15:45:07,301 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:45:07,302 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-10-22 15:45:07,309 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f97972c89/c302f909c9774c44ae95e35ac71c6306/FLAGab50c33d9 [2018-10-22 15:45:07,325 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f97972c89/c302f909c9774c44ae95e35ac71c6306 [2018-10-22 15:45:07,337 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:45:07,339 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:45:07,340 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:45:07,340 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:45:07,344 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:45:07,345 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d7983bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07, skipping insertion in model container [2018-10-22 15:45:07,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,361 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:45:07,386 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:45:07,601 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:45:07,606 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:45:07,623 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:45:07,640 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:45:07,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07 WrapperNode [2018-10-22 15:45:07,641 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:45:07,642 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:45:07,642 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:45:07,642 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:45:07,651 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,657 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,676 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:45:07,677 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:45:07,677 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:45:07,677 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:45:07,688 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,688 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,691 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,697 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (1/1) ... [2018-10-22 15:45:07,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:45:07,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:45:07,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:45:07,701 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:45:07,702 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (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 [2018-10-22 15:45:07,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:45:07,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:45:07,992 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:45:07,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:45:07 BoogieIcfgContainer [2018-10-22 15:45:07,993 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:45:07,994 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:45:07,994 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:45:07,997 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:45:07,998 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:45:07" (1/3) ... [2018-10-22 15:45:07,998 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32edb2ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:45:07, skipping insertion in model container [2018-10-22 15:45:07,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:45:07" (2/3) ... [2018-10-22 15:45:07,999 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32edb2ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:45:07, skipping insertion in model container [2018-10-22 15:45:07,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:45:07" (3/3) ... [2018-10-22 15:45:08,001 INFO L112 eAbstractionObserver]: Analyzing ICFG overflow_true-unreach-call1.i [2018-10-22 15:45:08,011 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:45:08,019 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:45:08,036 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:45:08,065 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:45:08,066 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:45:08,066 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:45:08,066 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:45:08,066 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:45:08,066 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:45:08,067 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:45:08,067 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:45:08,067 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:45:08,079 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-22 15:45:08,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-22 15:45:08,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:08,086 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-22 15:45:08,089 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:08,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:08,095 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-22 15:45:08,097 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:08,098 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:08,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:08,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:08,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:08,203 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:45:08,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:45:08,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:45:08,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:45:08,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:45:08,226 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-22 15:45:08,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:08,242 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-22 15:45:08,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:45:08,244 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-22 15:45:08,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:08,254 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:45:08,254 INFO L226 Difference]: Without dead ends: 8 [2018-10-22 15:45:08,258 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 [2018-10-22 15:45:08,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-22 15:45:08,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-22 15:45:08,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-22 15:45:08,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-22 15:45:08,287 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-22 15:45:08,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:08,287 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-22 15:45:08,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:45:08,288 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-22 15:45:08,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-22 15:45:08,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:08,288 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:08,289 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:08,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:08,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-22 15:45:08,289 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:08,289 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:08,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,291 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:08,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:08,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:08,427 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:45:08,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:45:08,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:45:08,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:45:08,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:45:08,438 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-22 15:45:08,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:08,496 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-22 15:45:08,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:45:08,497 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-22 15:45:08,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:08,498 INFO L225 Difference]: With dead ends: 14 [2018-10-22 15:45:08,498 INFO L226 Difference]: Without dead ends: 10 [2018-10-22 15:45:08,499 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 [2018-10-22 15:45:08,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-22 15:45:08,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-22 15:45:08,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-22 15:45:08,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-22 15:45:08,502 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-22 15:45:08,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:08,503 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-22 15:45:08,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:45:08,503 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-22 15:45:08,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-22 15:45:08,504 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:08,504 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:08,504 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:08,504 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:08,505 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-22 15:45:08,505 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:08,505 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:08,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:08,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:08,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:08,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:08,665 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 [2018-10-22 15:45:08,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:08,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:08,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:08,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:08,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:08,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-22 15:45:08,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 15:45:08,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 15:45:08,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:45:08,769 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-22 15:45:08,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:08,812 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-22 15:45:08,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 15:45:08,813 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-22 15:45:08,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:08,814 INFO L225 Difference]: With dead ends: 16 [2018-10-22 15:45:08,814 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 15:45:08,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-22 15:45:08,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 15:45:08,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 15:45:08,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 15:45:08,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 15:45:08,818 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-22 15:45:08,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:08,820 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 15:45:08,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 15:45:08,820 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 15:45:08,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 15:45:08,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:08,823 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:08,824 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:08,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:08,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-22 15:45:08,824 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:08,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:08,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:08,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:08,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:09,003 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:09,003 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 [2018-10-22 15:45:09,014 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:45:09,031 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:45:09,032 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:09,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:09,046 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:09,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-22 15:45:09,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:45:09,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:45:09,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:45:09,069 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-22 15:45:09,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:09,228 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-22 15:45:09,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:45:09,229 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-22 15:45:09,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:09,230 INFO L225 Difference]: With dead ends: 18 [2018-10-22 15:45:09,230 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 15:45:09,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 15:45:09,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 15:45:09,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 15:45:09,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 15:45:09,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 15:45:09,234 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 15:45:09,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:09,234 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 15:45:09,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:45:09,235 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 15:45:09,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:45:09,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:09,236 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:09,236 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:09,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:09,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-22 15:45:09,237 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:09,237 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:09,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:09,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:09,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:09,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:09,541 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:09,541 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 [2018-10-22 15:45:09,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:45:09,581 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:45:09,581 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:09,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:09,604 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:09,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-22 15:45:09,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 15:45:09,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 15:45:09,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:45:09,626 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-22 15:45:09,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:09,676 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-22 15:45:09,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 15:45:09,677 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-22 15:45:09,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:09,677 INFO L225 Difference]: With dead ends: 20 [2018-10-22 15:45:09,678 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 15:45:09,678 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-22 15:45:09,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 15:45:09,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 15:45:09,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 15:45:09,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 15:45:09,682 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 15:45:09,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:09,682 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 15:45:09,682 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 15:45:09,683 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 15:45:09,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 15:45:09,683 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:09,684 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:09,684 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:09,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:09,684 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-22 15:45:09,684 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:09,685 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:09,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:09,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:09,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:09,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:09,828 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:09,829 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 [2018-10-22 15:45:09,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:45:09,847 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:45:09,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:09,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:09,901 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:09,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:09,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-22 15:45:09,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 15:45:09,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 15:45:09,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:45:09,933 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-22 15:45:10,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:10,038 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-22 15:45:10,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:45:10,039 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-22 15:45:10,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:10,040 INFO L225 Difference]: With dead ends: 22 [2018-10-22 15:45:10,041 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 15:45:10,041 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:45:10,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 15:45:10,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 15:45:10,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 15:45:10,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 15:45:10,046 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 15:45:10,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:10,046 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 15:45:10,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 15:45:10,046 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 15:45:10,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 15:45:10,047 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:10,047 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:10,047 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:10,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:10,048 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-22 15:45:10,048 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:10,048 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:10,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:10,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:10,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:10,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:10,256 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:10,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:10,257 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 [2018-10-22 15:45:10,272 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:45:10,301 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:45:10,301 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:10,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:10,318 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:10,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:10,342 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-22 15:45:10,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 15:45:10,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 15:45:10,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:45:10,343 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-22 15:45:10,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:10,747 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-22 15:45:10,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:45:10,750 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-22 15:45:10,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:10,751 INFO L225 Difference]: With dead ends: 24 [2018-10-22 15:45:10,751 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 15:45:10,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-22 15:45:10,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 15:45:10,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 15:45:10,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 15:45:10,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 15:45:10,760 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 15:45:10,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:10,761 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 15:45:10,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 15:45:10,761 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 15:45:10,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 15:45:10,762 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:10,762 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:10,763 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:10,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:10,763 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-22 15:45:10,763 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:10,763 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:10,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:10,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:10,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:10,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:11,117 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:11,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:11,118 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 [2018-10-22 15:45:11,126 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:45:23,159 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:45:23,159 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:23,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:23,184 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:23,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:23,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-22 15:45:23,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:45:23,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:45:23,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:45:23,207 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2018-10-22 15:45:23,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:23,323 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-22 15:45:23,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 15:45:23,325 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-22 15:45:23,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:23,326 INFO L225 Difference]: With dead ends: 26 [2018-10-22 15:45:23,326 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 15:45:23,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:45:23,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 15:45:23,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 15:45:23,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 15:45:23,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 15:45:23,332 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 15:45:23,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:23,332 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 15:45:23,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:45:23,332 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 15:45:23,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 15:45:23,333 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:23,333 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:23,334 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:23,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:23,334 INFO L82 PathProgramCache]: Analyzing trace with hash 361681633, now seen corresponding path program 7 times [2018-10-22 15:45:23,334 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:23,334 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:23,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:23,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:23,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:23,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:23,601 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:23,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:23,602 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 [2018-10-22 15:45:23,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:23,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:23,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:23,671 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:23,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-22 15:45:23,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 15:45:23,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 15:45:23,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-22 15:45:23,673 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 10 states. [2018-10-22 15:45:23,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:23,825 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-10-22 15:45:23,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:45:23,826 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2018-10-22 15:45:23,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:23,827 INFO L225 Difference]: With dead ends: 28 [2018-10-22 15:45:23,827 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 15:45:23,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-22 15:45:23,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 15:45:23,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 15:45:23,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 15:45:23,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 15:45:23,833 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 15:45:23,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:23,833 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 15:45:23,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 15:45:23,833 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 15:45:23,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 15:45:23,834 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:23,834 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:23,835 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:23,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:23,835 INFO L82 PathProgramCache]: Analyzing trace with hash -268550885, now seen corresponding path program 8 times [2018-10-22 15:45:23,835 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:23,835 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:23,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:23,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:45:23,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:23,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:24,082 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:24,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:24,083 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 [2018-10-22 15:45:24,095 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:45:24,123 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:45:24,123 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:24,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:24,137 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:24,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:24,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-22 15:45:24,160 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:45:24,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:45:24,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:45:24,161 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 11 states. [2018-10-22 15:45:24,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:24,269 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 15:45:24,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 15:45:24,270 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2018-10-22 15:45:24,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:24,272 INFO L225 Difference]: With dead ends: 30 [2018-10-22 15:45:24,272 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 15:45:24,273 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-22 15:45:24,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 15:45:24,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 15:45:24,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 15:45:24,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 15:45:24,277 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-22 15:45:24,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:24,278 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 15:45:24,278 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:45:24,278 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 15:45:24,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:45:24,279 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:24,279 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:24,279 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:24,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:24,280 INFO L82 PathProgramCache]: Analyzing trace with hash -331611947, now seen corresponding path program 9 times [2018-10-22 15:45:24,280 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:24,280 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:24,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:24,281 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:24,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:24,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:24,501 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:24,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:24,502 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 [2018-10-22 15:45:24,509 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:45:24,564 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:45:24,564 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:24,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:24,586 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:24,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:24,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-22 15:45:24,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:45:24,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:45:24,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:45:24,609 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-10-22 15:45:24,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:24,781 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-22 15:45:24,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 15:45:24,782 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-10-22 15:45:24,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:24,783 INFO L225 Difference]: With dead ends: 32 [2018-10-22 15:45:24,784 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 15:45:24,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-22 15:45:24,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 15:45:24,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-22 15:45:24,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 15:45:24,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-22 15:45:24,789 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-22 15:45:24,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:24,790 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-22 15:45:24,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:45:24,790 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-22 15:45:24,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 15:45:24,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:24,791 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:24,791 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:24,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:24,792 INFO L82 PathProgramCache]: Analyzing trace with hash -803750385, now seen corresponding path program 10 times [2018-10-22 15:45:24,792 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:24,792 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:24,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:24,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:24,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:24,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:25,426 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:25,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:25,426 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 [2018-10-22 15:45:25,441 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:45:25,467 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:45:25,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:45:25,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:45:25,492 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:25,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:45:25,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-22 15:45:25,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 15:45:25,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 15:45:25,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:45:25,525 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 13 states. [2018-10-22 15:45:25,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:45:25,791 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-10-22 15:45:25,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 15:45:25,792 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2018-10-22 15:45:25,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:45:25,793 INFO L225 Difference]: With dead ends: 34 [2018-10-22 15:45:25,793 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 15:45:25,794 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:45:25,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 15:45:25,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 15:45:25,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 15:45:25,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 15:45:25,798 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-22 15:45:25,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:45:25,799 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 15:45:25,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 15:45:25,799 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 15:45:25,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 15:45:25,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:45:25,800 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1] [2018-10-22 15:45:25,800 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:45:25,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:45:25,801 INFO L82 PathProgramCache]: Analyzing trace with hash 737744073, now seen corresponding path program 11 times [2018-10-22 15:45:25,801 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:45:25,801 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:45:25,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:25,802 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:45:25,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:45:25,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:45:26,151 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:45:26,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:45:26,151 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 [2018-10-22 15:45:26,159 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:46:18,050 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:46:18,051 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:18,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:18,127 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:18,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:18,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-22 15:46:18,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 15:46:18,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 15:46:18,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:46:18,132 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 14 states. [2018-10-22 15:46:18,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:18,290 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 15:46:18,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:46:18,291 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-10-22 15:46:18,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:18,292 INFO L225 Difference]: With dead ends: 36 [2018-10-22 15:46:18,293 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 15:46:18,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:46:18,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 15:46:18,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 15:46:18,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 15:46:18,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 15:46:18,298 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-22 15:46:18,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:18,298 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 15:46:18,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 15:46:18,299 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 15:46:18,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 15:46:18,299 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:18,300 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:18,300 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:18,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:18,300 INFO L82 PathProgramCache]: Analyzing trace with hash 350201091, now seen corresponding path program 12 times [2018-10-22 15:46:18,300 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:18,300 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:18,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:18,301 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:18,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:18,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:18,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:18,685 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 [2018-10-22 15:46:18,693 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:46:30,782 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:46:30,782 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:30,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:30,803 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:30,823 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:30,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-22 15:46:30,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 15:46:30,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 15:46:30,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:46:30,825 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 15 states. [2018-10-22 15:46:31,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:31,036 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-22 15:46:31,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 15:46:31,036 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2018-10-22 15:46:31,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:31,037 INFO L225 Difference]: With dead ends: 38 [2018-10-22 15:46:31,038 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 15:46:31,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:46:31,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 15:46:31,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-22 15:46:31,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 15:46:31,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-22 15:46:31,043 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-22 15:46:31,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:31,043 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-22 15:46:31,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 15:46:31,043 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-22 15:46:31,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 15:46:31,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:31,044 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:31,044 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:31,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:31,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1583550141, now seen corresponding path program 13 times [2018-10-22 15:46:31,045 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:31,045 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:31,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:31,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:31,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:31,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:31,722 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:31,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:31,722 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 [2018-10-22 15:46:31,730 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:46:31,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:31,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:31,762 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:31,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:31,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-22 15:46:31,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 15:46:31,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 15:46:31,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:46:31,784 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 16 states. [2018-10-22 15:46:32,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:32,086 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-10-22 15:46:32,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:46:32,086 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-10-22 15:46:32,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:32,088 INFO L225 Difference]: With dead ends: 40 [2018-10-22 15:46:32,088 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 15:46:32,089 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-22 15:46:32,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 15:46:32,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-22 15:46:32,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 15:46:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 15:46:32,093 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-22 15:46:32,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:32,094 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 15:46:32,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 15:46:32,094 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 15:46:32,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:46:32,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:32,095 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:32,095 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:32,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:32,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1421013495, now seen corresponding path program 14 times [2018-10-22 15:46:32,096 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:32,096 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:32,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:32,097 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:46:32,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:32,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:32,924 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:32,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:32,925 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 [2018-10-22 15:46:32,948 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:46:32,969 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:46:32,969 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:32,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:33,030 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:33,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:33,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-22 15:46:33,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:46:33,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:46:33,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:46:33,055 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 17 states. [2018-10-22 15:46:33,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:33,249 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 15:46:33,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 15:46:33,249 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-22 15:46:33,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:33,250 INFO L225 Difference]: With dead ends: 42 [2018-10-22 15:46:33,250 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 15:46:33,251 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:46:33,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 15:46:33,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-22 15:46:33,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 15:46:33,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 15:46:33,256 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-22 15:46:33,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:33,256 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 15:46:33,256 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:46:33,256 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 15:46:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 15:46:33,257 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:33,257 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:33,257 INFO L424 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:33,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:33,257 INFO L82 PathProgramCache]: Analyzing trace with hash -157880655, now seen corresponding path program 15 times [2018-10-22 15:46:33,258 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:33,258 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:33,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:33,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:33,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:33,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:33,582 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:33,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:33,583 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 [2018-10-22 15:46:33,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:46:33,649 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 15:46:33,649 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:33,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:33,695 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:33,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:33,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-22 15:46:33,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 15:46:33,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 15:46:33,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-22 15:46:33,725 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 18 states. [2018-10-22 15:46:34,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:34,097 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-22 15:46:34,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 15:46:34,098 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2018-10-22 15:46:34,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:34,099 INFO L225 Difference]: With dead ends: 44 [2018-10-22 15:46:34,099 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 15:46:34,100 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-22 15:46:34,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 15:46:34,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-22 15:46:34,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-22 15:46:34,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-22 15:46:34,105 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-22 15:46:34,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:34,108 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-22 15:46:34,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 15:46:34,108 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-22 15:46:34,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 15:46:34,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:34,109 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:34,109 INFO L424 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:34,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:34,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1351703317, now seen corresponding path program 16 times [2018-10-22 15:46:34,111 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:34,112 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:34,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:34,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:34,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:34,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:34,551 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:34,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:34,551 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 [2018-10-22 15:46:34,560 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:46:34,589 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:46:34,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:46:34,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:46:34,659 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:34,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:46:34,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-22 15:46:34,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 15:46:34,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 15:46:34,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:46:34,690 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 19 states. [2018-10-22 15:46:34,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:46:34,964 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-10-22 15:46:34,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:46:34,964 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2018-10-22 15:46:34,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:46:34,965 INFO L225 Difference]: With dead ends: 46 [2018-10-22 15:46:34,965 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 15:46:34,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:46:34,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 15:46:34,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 15:46:34,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 15:46:34,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 15:46:34,970 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-22 15:46:34,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:46:34,971 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 15:46:34,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 15:46:34,971 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 15:46:34,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 15:46:34,971 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:46:34,972 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1] [2018-10-22 15:46:34,972 INFO L424 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:46:34,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:46:34,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1859013467, now seen corresponding path program 17 times [2018-10-22 15:46:34,972 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:46:34,972 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:46:34,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:34,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:46:34,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:46:34,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:46:35,293 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:46:35,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:46:35,294 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 [2018-10-22 15:46:35,308 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:48:10,122 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 15:48:10,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:10,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:10,443 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:10,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:10,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-10-22 15:48:10,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 15:48:10,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 15:48:10,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-22 15:48:10,473 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 20 states. [2018-10-22 15:48:11,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:11,165 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 15:48:11,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 15:48:11,165 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2018-10-22 15:48:11,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:11,166 INFO L225 Difference]: With dead ends: 48 [2018-10-22 15:48:11,166 INFO L226 Difference]: Without dead ends: 44 [2018-10-22 15:48:11,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-22 15:48:11,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-22 15:48:11,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-22 15:48:11,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-22 15:48:11,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-22 15:48:11,171 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-22 15:48:11,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:11,172 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-22 15:48:11,172 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 15:48:11,172 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-22 15:48:11,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 15:48:11,172 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:11,172 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:11,173 INFO L424 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:11,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:11,173 INFO L82 PathProgramCache]: Analyzing trace with hash 242204127, now seen corresponding path program 18 times [2018-10-22 15:48:11,173 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:11,173 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:11,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:11,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:11,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:11,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:11,675 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:11,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:11,675 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:11,684 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:48:45,754 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 15:48:45,754 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:45,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:45,813 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:45,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:45,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-10-22 15:48:45,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 15:48:45,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 15:48:45,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:48:45,837 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 21 states. [2018-10-22 15:48:46,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:46,286 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-10-22 15:48:46,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 15:48:46,287 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2018-10-22 15:48:46,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:46,288 INFO L225 Difference]: With dead ends: 50 [2018-10-22 15:48:46,288 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 15:48:46,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:48:46,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 15:48:46,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-22 15:48:46,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-22 15:48:46,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-22 15:48:46,294 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-22 15:48:46,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:46,294 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-22 15:48:46,294 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 15:48:46,294 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-22 15:48:46,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 15:48:46,295 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:46,295 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:46,295 INFO L424 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:46,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:46,295 INFO L82 PathProgramCache]: Analyzing trace with hash 877682841, now seen corresponding path program 19 times [2018-10-22 15:48:46,296 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:46,296 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:46,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:46,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:46,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:46,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:46,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:46,843 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:46,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:48:46,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:46,885 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:46,915 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:46,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:46,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-10-22 15:48:46,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 15:48:46,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 15:48:46,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-22 15:48:46,936 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 22 states. [2018-10-22 15:48:47,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:47,268 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-10-22 15:48:47,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 15:48:47,268 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2018-10-22 15:48:47,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:47,269 INFO L225 Difference]: With dead ends: 52 [2018-10-22 15:48:47,269 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 15:48:47,270 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-10-22 15:48:47,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 15:48:47,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-22 15:48:47,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 15:48:47,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-22 15:48:47,275 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-22 15:48:47,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:47,275 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-22 15:48:47,275 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 15:48:47,276 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-22 15:48:47,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 15:48:47,276 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:47,276 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:47,277 INFO L424 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:47,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:47,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1687370963, now seen corresponding path program 20 times [2018-10-22 15:48:47,277 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:47,277 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:47,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:47,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:48:47,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:47,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:47,648 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:47,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:47,649 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:47,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:48:47,671 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:48:47,671 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:47,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:47,706 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:47,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:47,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-10-22 15:48:47,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 15:48:47,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 15:48:47,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-22 15:48:47,727 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 23 states. [2018-10-22 15:48:48,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:48,135 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-22 15:48:48,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 15:48:48,136 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2018-10-22 15:48:48,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:48,138 INFO L225 Difference]: With dead ends: 54 [2018-10-22 15:48:48,138 INFO L226 Difference]: Without dead ends: 50 [2018-10-22 15:48:48,139 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-10-22 15:48:48,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-22 15:48:48,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-22 15:48:48,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 15:48:48,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-22 15:48:48,143 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-22 15:48:48,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:48,144 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-22 15:48:48,144 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 15:48:48,144 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-22 15:48:48,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-22 15:48:48,144 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:48,145 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:48,145 INFO L424 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:48,145 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:48,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1886391667, now seen corresponding path program 21 times [2018-10-22 15:48:48,145 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:48,146 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:48,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:48,146 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:48,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:48,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:49,734 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:49,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:49,734 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:49,742 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:48:49,791 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 15:48:49,792 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:49,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:49,828 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:49,850 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:49,850 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-10-22 15:48:49,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 15:48:49,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 15:48:49,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-22 15:48:49,851 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 24 states. [2018-10-22 15:48:50,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:50,213 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-10-22 15:48:50,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 15:48:50,214 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2018-10-22 15:48:50,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:50,214 INFO L225 Difference]: With dead ends: 56 [2018-10-22 15:48:50,215 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 15:48:50,215 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-10-22 15:48:50,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 15:48:50,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-22 15:48:50,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 15:48:50,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-22 15:48:50,221 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-22 15:48:50,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:50,221 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-22 15:48:50,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 15:48:50,221 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-22 15:48:50,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-22 15:48:50,222 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:50,222 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:50,222 INFO L424 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:50,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:50,222 INFO L82 PathProgramCache]: Analyzing trace with hash -298442297, now seen corresponding path program 22 times [2018-10-22 15:48:50,223 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:50,223 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:50,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:50,223 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:50,224 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:50,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:50,807 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:50,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:50,808 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:50,815 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:48:50,832 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:48:50,833 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:48:50,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:48:50,871 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:50,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-22 15:48:50,894 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-10-22 15:48:50,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 15:48:50,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 15:48:50,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:48:50,895 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 25 states. [2018-10-22 15:48:51,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:48:51,291 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-10-22 15:48:51,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 15:48:51,291 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2018-10-22 15:48:51,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:48:51,292 INFO L225 Difference]: With dead ends: 58 [2018-10-22 15:48:51,292 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 15:48:51,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:48:51,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 15:48:51,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-22 15:48:51,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 15:48:51,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-22 15:48:51,298 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-22 15:48:51,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:48:51,298 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-22 15:48:51,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 15:48:51,298 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-22 15:48:51,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 15:48:51,298 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:48:51,299 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1] [2018-10-22 15:48:51,299 INFO L424 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:48:51,299 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:48:51,299 INFO L82 PathProgramCache]: Analyzing trace with hash 1007512193, now seen corresponding path program 23 times [2018-10-22 15:48:51,299 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-22 15:48:51,299 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-22 15:48:51,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:51,300 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:48:51,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:48:51,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:48:52,736 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:48:52,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:48:52,736 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:48:52,744 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown