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/phases_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:54:15,975 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:54:15,977 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:54:15,989 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:54:15,989 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:54:15,991 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:54:15,993 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:54:15,995 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:54:15,997 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:54:15,998 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:54:15,999 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:54:16,000 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:54:16,001 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:54:16,001 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:54:16,004 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:54:16,005 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:54:16,006 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:54:16,007 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:54:16,016 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:54:16,021 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:54:16,022 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:54:16,025 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:54:16,029 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:54:16,043 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:54:16,068 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:54:16,068 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:54:16,069 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:54:16,069 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:54:16,070 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:54:16,070 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:54:16,070 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:54:16,070 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:54:16,071 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:54:16,072 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:54:16,072 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:54:16,072 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:54:16,072 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:54:16,072 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:54:16,073 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:16,073 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:54:16,073 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:54:16,073 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:54:16,074 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:54:16,074 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:54:16,074 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:54:16,074 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:54:16,074 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:54:16,117 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:54:16,129 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:54:16,132 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:54:16,134 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:54:16,134 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:54:16,135 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-24 11:54:16,191 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/590ee664f/0ae5679e19b340b1adc03346abbc63ab/FLAGb03e192f0 [2018-10-24 11:54:16,610 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:54:16,610 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_true-unreach-call1.i [2018-10-24 11:54:16,616 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/590ee664f/0ae5679e19b340b1adc03346abbc63ab/FLAGb03e192f0 [2018-10-24 11:54:16,630 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/590ee664f/0ae5679e19b340b1adc03346abbc63ab [2018-10-24 11:54:16,639 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:54:16,641 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:54:16,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:16,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:54:16,646 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:54:16,647 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@286f3120 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16, skipping insertion in model container [2018-10-24 11:54:16,650 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,660 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:54:16,680 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:54:16,852 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:16,856 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:54:16,875 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:54:16,892 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:54:16,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16 WrapperNode [2018-10-24 11:54:16,893 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:54:16,894 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:16,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:54:16,894 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:54:16,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,910 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,931 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:54:16,931 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:54:16,931 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:54:16,931 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:54:16,942 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,942 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,943 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,943 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,945 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,951 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,952 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... [2018-10-24 11:54:16,954 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:54:16,954 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:54:16,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:54:16,955 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:54:16,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:54:17,071 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:54:17,071 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:54:17,266 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:54:17,267 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:17 BoogieIcfgContainer [2018-10-24 11:54:17,267 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:54:17,268 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:54:17,268 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:54:17,271 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:54:17,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:54:16" (1/3) ... [2018-10-24 11:54:17,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52bc498d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:17, skipping insertion in model container [2018-10-24 11:54:17,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:54:16" (2/3) ... [2018-10-24 11:54:17,273 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52bc498d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:54:17, skipping insertion in model container [2018-10-24 11:54:17,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:54:17" (3/3) ... [2018-10-24 11:54:17,275 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_true-unreach-call1.i [2018-10-24 11:54:17,283 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:54:17,290 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:54:17,307 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:54:17,339 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:54:17,340 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:54:17,340 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:54:17,340 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:54:17,340 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:54:17,340 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:54:17,340 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:54:17,341 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:54:17,341 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:54:17,356 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states. [2018-10-24 11:54:17,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:54:17,361 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:17,362 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:54:17,364 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:17,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:17,371 INFO L82 PathProgramCache]: Analyzing trace with hash 889968487, now seen corresponding path program 1 times [2018-10-24 11:54:17,373 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:17,374 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:17,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,430 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:17,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:17,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:17,487 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:17,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:54:17,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:54:17,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:54:17,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:17,506 INFO L87 Difference]: Start difference. First operand 13 states. Second operand 2 states. [2018-10-24 11:54:17,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:17,522 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2018-10-24 11:54:17,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:54:17,524 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:54:17,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:17,534 INFO L225 Difference]: With dead ends: 21 [2018-10-24 11:54:17,534 INFO L226 Difference]: Without dead ends: 9 [2018-10-24 11:54:17,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:54:17,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-24 11:54:17,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-24 11:54:17,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-24 11:54:17,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-10-24 11:54:17,573 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-10-24 11:54:17,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:17,573 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-10-24 11:54:17,573 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:54:17,573 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-10-24 11:54:17,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:54:17,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:17,574 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:17,575 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:17,575 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:17,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1805929617, now seen corresponding path program 1 times [2018-10-24 11:54:17,575 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:17,575 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:17,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:17,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:17,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:17,727 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:54:17,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:54:17,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:54:17,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:54:17,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:17,733 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-10-24 11:54:17,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:17,805 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2018-10-24 11:54:17,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:54:17,805 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:54:17,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:17,806 INFO L225 Difference]: With dead ends: 19 [2018-10-24 11:54:17,806 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:54:17,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:54:17,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:54:17,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:54:17,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:54:17,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-10-24 11:54:17,811 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2018-10-24 11:54:17,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:17,812 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-10-24 11:54:17,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:54:17,812 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-10-24 11:54:17,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 11:54:17,812 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:17,813 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:17,813 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:17,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:17,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1049525042, now seen corresponding path program 1 times [2018-10-24 11:54:17,814 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:17,814 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:17,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:17,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:17,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:17,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:17,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:17,935 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:17,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:17,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:17,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:18,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:18,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:54:18,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:54:18,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:54:18,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:54:18,026 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 4 states. [2018-10-24 11:54:18,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:18,111 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2018-10-24 11:54:18,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:54:18,112 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2018-10-24 11:54:18,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:18,113 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:54:18,113 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 11:54:18,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:54:18,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 11:54:18,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 11:54:18,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 11:54:18,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-24 11:54:18,120 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-24 11:54:18,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:18,121 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-24 11:54:18,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:54:18,121 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-24 11:54:18,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:54:18,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:18,122 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:18,125 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:18,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:18,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1777006735, now seen corresponding path program 2 times [2018-10-24 11:54:18,125 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:18,126 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:18,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:18,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:18,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:18,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:18,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:18,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:18,268 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:18,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:18,313 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:18,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:18,315 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:18,373 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:18,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:18,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:54:18,394 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:54:18,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:54:18,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:18,395 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-10-24 11:54:18,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:18,668 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2018-10-24 11:54:18,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:54:18,669 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-24 11:54:18,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:18,670 INFO L225 Difference]: With dead ends: 25 [2018-10-24 11:54:18,670 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:54:18,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:54:18,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:54:18,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:54:18,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:54:18,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 11:54:18,674 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 11:54:18,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:18,675 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 11:54:18,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:54:18,675 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 11:54:18,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 11:54:18,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:18,676 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:18,676 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:18,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:18,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1779147282, now seen corresponding path program 3 times [2018-10-24 11:54:18,677 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:18,677 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:18,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:18,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:18,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:18,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:18,849 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:18,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:18,849 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:18,857 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:18,863 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 11:54:18,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:18,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:18,888 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 11:54:18,908 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 11:54:18,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2018-10-24 11:54:18,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:54:18,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:54:18,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:18,910 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2018-10-24 11:54:19,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:19,107 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2018-10-24 11:54:19,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:54:19,108 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2018-10-24 11:54:19,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:19,109 INFO L225 Difference]: With dead ends: 31 [2018-10-24 11:54:19,109 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 11:54:19,111 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:54:19,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 11:54:19,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 11:54:19,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 11:54:19,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 11:54:19,116 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 16 [2018-10-24 11:54:19,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:19,116 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 11:54:19,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:54:19,116 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 11:54:19,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 11:54:19,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:19,117 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:19,118 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:19,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:19,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1231130700, now seen corresponding path program 1 times [2018-10-24 11:54:19,118 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:19,119 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:19,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:19,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:19,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:19,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:19,308 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:19,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:19,308 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:19,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:19,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:19,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:19,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:19,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 8 [2018-10-24 11:54:19,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:54:19,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:54:19,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:19,406 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-10-24 11:54:19,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:19,885 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 11:54:19,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:54:19,886 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2018-10-24 11:54:19,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:19,887 INFO L225 Difference]: With dead ends: 35 [2018-10-24 11:54:19,888 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 11:54:19,888 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:54:19,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 11:54:19,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 11:54:19,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 11:54:19,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2018-10-24 11:54:19,901 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 22 [2018-10-24 11:54:19,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:19,903 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2018-10-24 11:54:19,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:54:19,903 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2018-10-24 11:54:19,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 11:54:19,904 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:19,905 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:19,905 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:19,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:19,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1472252305, now seen corresponding path program 2 times [2018-10-24 11:54:19,906 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:19,906 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:19,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:19,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:54:19,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:19,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:20,172 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:20,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:20,173 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:20,181 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:54:20,203 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:54:20,203 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:20,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:20,243 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:20,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:20,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-24 11:54:20,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 11:54:20,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 11:54:20,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:20,266 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 9 states. [2018-10-24 11:54:20,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:20,397 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-10-24 11:54:20,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:54:20,397 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2018-10-24 11:54:20,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:20,398 INFO L225 Difference]: With dead ends: 38 [2018-10-24 11:54:20,398 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 11:54:20,399 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-24 11:54:20,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 11:54:20,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 11:54:20,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 11:54:20,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-24 11:54:20,406 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 25 [2018-10-24 11:54:20,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:20,406 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-24 11:54:20,406 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 11:54:20,407 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-24 11:54:20,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 11:54:20,407 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:20,408 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:20,408 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:20,408 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:20,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1271380332, now seen corresponding path program 3 times [2018-10-24 11:54:20,408 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:20,408 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:20,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:20,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:20,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:20,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:20,673 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:20,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:20,673 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:20,684 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:54:20,693 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 11:54:20,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:20,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:20,752 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 11:54:20,772 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:20,772 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 4] total 12 [2018-10-24 11:54:20,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:54:20,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:54:20,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:20,773 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 12 states. [2018-10-24 11:54:21,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:21,091 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2018-10-24 11:54:21,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 11:54:21,091 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2018-10-24 11:54:21,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:21,092 INFO L225 Difference]: With dead ends: 48 [2018-10-24 11:54:21,093 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 11:54:21,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:54:21,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 11:54:21,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2018-10-24 11:54:21,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 11:54:21,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-10-24 11:54:21,099 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2018-10-24 11:54:21,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:21,099 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-10-24 11:54:21,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:54:21,099 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-10-24 11:54:21,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 11:54:21,100 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:21,101 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 7, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:21,101 INFO L424 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:21,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:21,101 INFO L82 PathProgramCache]: Analyzing trace with hash 242968718, now seen corresponding path program 4 times [2018-10-24 11:54:21,101 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:21,102 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:21,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:21,103 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:21,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:21,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:21,410 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:21,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:21,411 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:21,423 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:54:21,451 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:54:21,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:54:21,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:54:21,537 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 11:54:21,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:54:21,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 12 [2018-10-24 11:54:21,558 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 11:54:21,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 11:54:21,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:21,559 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 12 states. [2018-10-24 11:54:22,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:54:22,032 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2018-10-24 11:54:22,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 11:54:22,033 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2018-10-24 11:54:22,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:54:22,034 INFO L225 Difference]: With dead ends: 50 [2018-10-24 11:54:22,035 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 11:54:22,036 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-24 11:54:22,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 11:54:22,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 11:54:22,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 11:54:22,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-24 11:54:22,042 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-10-24 11:54:22,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:54:22,043 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-24 11:54:22,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 11:54:22,043 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-24 11:54:22,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 11:54:22,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:54:22,044 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 8, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:54:22,045 INFO L424 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:54:22,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:54:22,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1678118351, now seen corresponding path program 5 times [2018-10-24 11:54:22,045 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:54:22,045 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:54:22,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:22,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:54:22,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:54:22,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:54:22,601 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:54:22,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:54:22,602 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:54:22,612 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:55:36,365 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2018-10-24 11:55:36,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:36,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:36,434 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:36,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:36,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 13 [2018-10-24 11:55:36,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 11:55:36,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 11:55:36,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:55:36,457 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 13 states. [2018-10-24 11:55:36,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:36,827 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-10-24 11:55:36,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 11:55:36,828 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2018-10-24 11:55:36,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:36,830 INFO L225 Difference]: With dead ends: 53 [2018-10-24 11:55:36,830 INFO L226 Difference]: Without dead ends: 41 [2018-10-24 11:55:36,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-24 11:55:36,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-24 11:55:36,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-24 11:55:36,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 11:55:36,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-24 11:55:36,837 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2018-10-24 11:55:36,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:36,837 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-24 11:55:36,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 11:55:36,838 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-24 11:55:36,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 11:55:36,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:36,839 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 9, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:36,839 INFO L424 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:36,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:36,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1951195566, now seen corresponding path program 6 times [2018-10-24 11:55:36,840 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:36,840 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:36,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:36,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:36,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:36,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:37,139 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:37,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:37,140 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:37,150 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-24 11:55:37,187 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-24 11:55:37,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:37,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:37,295 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-24 11:55:37,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:37,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5] total 17 [2018-10-24 11:55:37,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:55:37,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:55:37,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:55:37,317 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 17 states. [2018-10-24 11:55:38,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:38,082 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2018-10-24 11:55:38,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:55:38,082 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 40 [2018-10-24 11:55:38,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:38,084 INFO L225 Difference]: With dead ends: 63 [2018-10-24 11:55:38,084 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 11:55:38,085 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-10-24 11:55:38,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 11:55:38,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2018-10-24 11:55:38,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 11:55:38,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-10-24 11:55:38,091 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 40 [2018-10-24 11:55:38,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:38,091 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-10-24 11:55:38,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:55:38,092 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-10-24 11:55:38,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 11:55:38,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:38,093 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 10, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:38,093 INFO L424 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:38,093 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:38,094 INFO L82 PathProgramCache]: Analyzing trace with hash -141931124, now seen corresponding path program 7 times [2018-10-24 11:55:38,094 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:38,094 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:38,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:38,095 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:38,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:38,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:38,507 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:38,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:38,508 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:38,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:55:38,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:38,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:38,648 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 88 proven. 165 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-24 11:55:38,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:38,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 16 [2018-10-24 11:55:38,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 11:55:38,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 11:55:38,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:55:38,674 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 16 states. [2018-10-24 11:55:38,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:38,991 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2018-10-24 11:55:38,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 11:55:38,992 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2018-10-24 11:55:38,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:38,993 INFO L225 Difference]: With dead ends: 65 [2018-10-24 11:55:38,993 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 11:55:38,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-24 11:55:38,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 11:55:39,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-24 11:55:39,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 11:55:39,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2018-10-24 11:55:39,001 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 46 [2018-10-24 11:55:39,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:39,002 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2018-10-24 11:55:39,002 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 11:55:39,002 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2018-10-24 11:55:39,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 11:55:39,003 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:39,003 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 11, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:39,003 INFO L424 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:39,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:39,004 INFO L82 PathProgramCache]: Analyzing trace with hash 871398063, now seen corresponding path program 8 times [2018-10-24 11:55:39,004 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:39,004 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:39,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:39,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:55:39,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:39,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:39,416 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:39,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:39,417 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:39,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:55:39,468 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:55:39,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:39,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:39,554 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:39,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:39,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-24 11:55:39,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 11:55:39,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 11:55:39,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:55:39,592 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 17 states. [2018-10-24 11:55:40,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:40,042 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2018-10-24 11:55:40,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 11:55:40,043 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2018-10-24 11:55:40,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:40,045 INFO L225 Difference]: With dead ends: 68 [2018-10-24 11:55:40,045 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 11:55:40,046 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-24 11:55:40,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 11:55:40,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-10-24 11:55:40,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 11:55:40,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-10-24 11:55:40,053 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2018-10-24 11:55:40,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:40,054 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-10-24 11:55:40,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 11:55:40,054 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-10-24 11:55:40,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 11:55:40,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:40,055 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 12, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:40,055 INFO L424 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:40,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:40,056 INFO L82 PathProgramCache]: Analyzing trace with hash -363915604, now seen corresponding path program 9 times [2018-10-24 11:55:40,056 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:40,056 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:40,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:40,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:40,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:40,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:40,498 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:40,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:40,498 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:40,507 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:55:40,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 11:55:40,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:40,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:40,682 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 15 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-24 11:55:40,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:40,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2018-10-24 11:55:40,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 11:55:40,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 11:55:40,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2018-10-24 11:55:40,705 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 22 states. [2018-10-24 11:55:44,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:44,066 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2018-10-24 11:55:44,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 11:55:44,067 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2018-10-24 11:55:44,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:44,068 INFO L225 Difference]: With dead ends: 78 [2018-10-24 11:55:44,068 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 11:55:44,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2018-10-24 11:55:44,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 11:55:44,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2018-10-24 11:55:44,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 11:55:44,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2018-10-24 11:55:44,074 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 52 [2018-10-24 11:55:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:44,075 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2018-10-24 11:55:44,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 11:55:44,075 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2018-10-24 11:55:44,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 11:55:44,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:44,076 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:44,077 INFO L424 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:44,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:44,077 INFO L82 PathProgramCache]: Analyzing trace with hash -820552626, now seen corresponding path program 10 times [2018-10-24 11:55:44,077 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:44,077 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:44,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:44,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:44,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:44,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:44,419 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:44,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:44,419 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:44,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:55:44,448 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:55:44,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:55:44,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:55:44,675 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 11:55:44,695 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:55:44,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 20 [2018-10-24 11:55:44,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 11:55:44,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 11:55:44,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:55:44,696 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand 20 states. [2018-10-24 11:55:47,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:55:47,051 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2018-10-24 11:55:47,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 11:55:47,052 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 58 [2018-10-24 11:55:47,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:55:47,053 INFO L225 Difference]: With dead ends: 80 [2018-10-24 11:55:47,053 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 11:55:47,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-24 11:55:47,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 11:55:47,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-24 11:55:47,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 11:55:47,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2018-10-24 11:55:47,062 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 58 [2018-10-24 11:55:47,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:55:47,062 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2018-10-24 11:55:47,062 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 11:55:47,062 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2018-10-24 11:55:47,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 11:55:47,063 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:55:47,063 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:55:47,064 INFO L424 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:55:47,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:55:47,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1183575281, now seen corresponding path program 11 times [2018-10-24 11:55:47,064 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:55:47,064 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:55:47,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:47,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:55:47,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:55:47,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:55:47,470 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:55:47,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:55:47,471 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:55:47,482 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown