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/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:30,363 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:30,366 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:30,383 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:30,383 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:30,385 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:30,387 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:30,389 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:30,399 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:30,401 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:30,401 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:30,403 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:30,404 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:30,405 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:30,406 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:30,408 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:30,409 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:30,413 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:30,416 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:30,418 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:30,419 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:30,423 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:30,425 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:00:30,442 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:00:30,470 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:30,470 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:30,471 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:30,471 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:30,472 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:30,472 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:30,472 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:30,472 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:30,472 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:30,473 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:30,473 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:30,473 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:30,474 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:30,474 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:30,474 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:30,474 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:30,474 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:30,475 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:30,475 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:30,475 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:30,475 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:30,476 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:30,476 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:30,476 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:30,476 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:30,476 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:30,476 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:30,477 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:30,477 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:30,477 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:30,477 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:30,477 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:30,478 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:30,478 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:30,544 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:30,561 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:30,565 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:30,567 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:30,567 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:30,568 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-10-22 16:00:30,646 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/18a92c81f/3343c808cb73412fbf62d7aa75c40fe1/FLAGce54370a3 [2018-10-22 16:00:31,045 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:31,046 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-10-22 16:00:31,052 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/18a92c81f/3343c808cb73412fbf62d7aa75c40fe1/FLAGce54370a3 [2018-10-22 16:00:31,067 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/18a92c81f/3343c808cb73412fbf62d7aa75c40fe1 [2018-10-22 16:00:31,079 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:31,080 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:31,081 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:31,082 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:31,085 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:31,085 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@322d085d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31, skipping insertion in model container [2018-10-22 16:00:31,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,098 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:31,118 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:31,331 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:31,335 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:31,354 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:31,371 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:31,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31 WrapperNode [2018-10-22 16:00:31,371 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:31,372 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:31,372 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:31,372 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:31,384 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,390 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,397 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:31,397 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:31,397 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:31,398 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:31,407 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,409 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,413 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,421 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,421 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... [2018-10-22 16:00:31,423 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:31,424 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:31,424 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:31,424 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:31,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:31,540 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:31,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:31,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:31,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:31,541 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:31,541 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:31,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:31,542 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:31,774 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:31,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:31 BoogieIcfgContainer [2018-10-22 16:00:31,775 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:31,776 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:31,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:31,779 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:31,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:31" (1/3) ... [2018-10-22 16:00:31,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57a43e5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:31, skipping insertion in model container [2018-10-22 16:00:31,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:31" (2/3) ... [2018-10-22 16:00:31,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57a43e5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:31, skipping insertion in model container [2018-10-22 16:00:31,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:31" (3/3) ... [2018-10-22 16:00:31,783 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_false-unreach-call1.i [2018-10-22 16:00:31,793 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:31,800 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:31,813 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:31,854 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:31,855 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:31,855 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:31,855 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:31,855 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:31,855 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:31,856 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:31,856 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:31,856 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:31,873 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-22 16:00:31,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:00:31,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:31,881 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:31,884 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:31,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:31,890 INFO L82 PathProgramCache]: Analyzing trace with hash -283544510, now seen corresponding path program 1 times [2018-10-22 16:00:31,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:31,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:31,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,944 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:31,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:32,008 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:32,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:32,009 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:32,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:32,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:32,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:32,033 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-22 16:00:32,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,056 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2018-10-22 16:00:32,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:32,058 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:00:32,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,067 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:00:32,067 INFO L226 Difference]: Without dead ends: 15 [2018-10-22 16:00:32,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:32,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-22 16:00:32,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-22 16:00:32,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:00:32,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-22 16:00:32,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-22 16:00:32,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,110 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-22 16:00:32,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:32,110 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-22 16:00:32,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:00:32,111 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,111 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,111 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,112 INFO L82 PathProgramCache]: Analyzing trace with hash -863512858, now seen corresponding path program 1 times [2018-10-22 16:00:32,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:32,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,114 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,326 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-22 16:00:32,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:32,347 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:32,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:32,348 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:32,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:32,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:32,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:32,352 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 3 states. [2018-10-22 16:00:32,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,451 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-10-22 16:00:32,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:32,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:00:32,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,453 INFO L225 Difference]: With dead ends: 25 [2018-10-22 16:00:32,453 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 16:00:32,454 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:32,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 16:00:32,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2018-10-22 16:00:32,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 16:00:32,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-22 16:00:32,462 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-22 16:00:32,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,462 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-22 16:00:32,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:32,466 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-22 16:00:32,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 16:00:32,467 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,467 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,467 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1427803270, now seen corresponding path program 1 times [2018-10-22 16:00:32,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:32,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,473 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:32,623 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:32,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:32,623 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:32,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:32,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:32,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:32,625 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2018-10-22 16:00:32,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,671 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-22 16:00:32,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:32,672 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-10-22 16:00:32,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,674 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:00:32,674 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:00:32,674 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:32,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:00:32,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:00:32,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:00:32,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-22 16:00:32,684 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2018-10-22 16:00:32,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,685 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-22 16:00:32,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:32,687 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-22 16:00:32,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:00:32,687 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,687 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,688 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,689 INFO L82 PathProgramCache]: Analyzing trace with hash 1523179828, now seen corresponding path program 1 times [2018-10-22 16:00:32,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:32,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,691 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:32,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,833 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:32,834 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:00:32,836 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [24], [28], [34], [37], [39], [45], [46], [47], [49] [2018-10-22 16:00:32,882 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:32,883 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:33,000 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:33,692 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:33,693 INFO L272 AbstractInterpreter]: Visited 16 different actions 252 times. Merged at 7 different actions 135 times. Widened at 3 different actions 38 times. Found 26 fixpoints after 4 different actions. Largest state had 4 variables. [2018-10-22 16:00:33,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:33,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,729 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:33,750 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,751 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:33,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:33,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:34,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,071 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:34,102 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:34,103 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:34,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:34,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,311 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:34,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:34,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4, 4, 4] total 11 [2018-10-22 16:00:34,314 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:34,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:34,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:34,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:00:34,316 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 7 states. [2018-10-22 16:00:34,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:34,609 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-10-22 16:00:34,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:34,611 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-10-22 16:00:34,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:34,612 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:00:34,612 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:00:34,613 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:34,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:00:34,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2018-10-22 16:00:34,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:00:34,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-22 16:00:34,620 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2018-10-22 16:00:34,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:34,620 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-22 16:00:34,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:34,621 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-22 16:00:34,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:00:34,622 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:34,622 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:34,622 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:34,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:34,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1070919706, now seen corresponding path program 2 times [2018-10-22 16:00:34,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:34,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,624 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:34,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,625 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:34,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,871 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:34,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,872 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:34,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:34,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:34,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,873 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:34,885 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:34,886 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:34,913 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:34,913 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:34,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,990 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:00:34,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,085 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:00:35,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,107 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:35,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:35,124 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,156 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:35,157 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,167 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:00:35,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,197 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (5)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:00:35,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:35,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-10-22 16:00:35,202 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:35,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:35,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:35,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:00:35,205 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2018-10-22 16:00:35,449 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-22 16:00:35,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:35,910 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2018-10-22 16:00:35,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:00:35,912 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-10-22 16:00:35,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:35,915 INFO L225 Difference]: With dead ends: 71 [2018-10-22 16:00:35,915 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 16:00:35,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:35,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 16:00:35,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-10-22 16:00:35,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 16:00:35,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-22 16:00:35,926 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2018-10-22 16:00:35,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:35,927 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-22 16:00:35,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:35,927 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-22 16:00:35,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:00:35,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:35,929 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:35,929 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:35,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:35,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1068904040, now seen corresponding path program 3 times [2018-10-22 16:00:35,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:35,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:35,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,931 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:35,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,115 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-10-22 16:00:36,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,116 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:36,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:36,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,117 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:36,128 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:36,128 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:36,147 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:00:36,148 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,202 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 72 proven. 12 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:36,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,417 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 72 proven. 12 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:36,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,439 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:36,459 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:36,459 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:36,523 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:00:36,523 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,543 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 72 proven. 12 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:36,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,565 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 72 proven. 12 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-10-22 16:00:36,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:36,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:00:36,567 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:36,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:36,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:36,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:36,568 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 6 states. [2018-10-22 16:00:36,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:36,621 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2018-10-22 16:00:36,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:36,622 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 44 [2018-10-22 16:00:36,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:36,623 INFO L225 Difference]: With dead ends: 81 [2018-10-22 16:00:36,624 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 16:00:36,625 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 170 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:36,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 16:00:36,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-22 16:00:36,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:00:36,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2018-10-22 16:00:36,634 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2018-10-22 16:00:36,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:36,635 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2018-10-22 16:00:36,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:36,635 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2018-10-22 16:00:36,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:00:36,636 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:36,637 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:36,637 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:36,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:36,638 INFO L82 PathProgramCache]: Analyzing trace with hash -67319326, now seen corresponding path program 4 times [2018-10-22 16:00:36,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:36,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,639 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:36,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,639 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,867 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:00:36,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,868 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,868 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:36,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:36,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,868 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:36,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:36,876 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:36,896 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:36,896 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:37,086 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:37,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,303 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 8 proven. 177 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:37,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,324 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:37,340 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:37,340 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:37,380 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:37,380 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:37,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:37,533 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 108 proven. 20 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2018-10-22 16:00:37,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,819 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 108 proven. 20 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2018-10-22 16:00:37,821 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:37,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 10, 7, 7] total 28 [2018-10-22 16:00:37,821 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:37,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:37,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:37,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=582, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:37,823 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 10 states. [2018-10-22 16:00:37,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:37,992 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2018-10-22 16:00:37,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:37,994 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 50 [2018-10-22 16:00:37,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:37,995 INFO L225 Difference]: With dead ends: 80 [2018-10-22 16:00:37,996 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:00:37,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 177 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=174, Invalid=582, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:37,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:00:38,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 64. [2018-10-22 16:00:38,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-22 16:00:38,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2018-10-22 16:00:38,011 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 50 [2018-10-22 16:00:38,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:38,011 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2018-10-22 16:00:38,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:38,012 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2018-10-22 16:00:38,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-22 16:00:38,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:38,014 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:38,014 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:38,014 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:38,015 INFO L82 PathProgramCache]: Analyzing trace with hash 46746086, now seen corresponding path program 5 times [2018-10-22 16:00:38,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:38,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:38,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,016 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:38,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:38,158 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-10-22 16:00:38,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,158 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:38,158 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:38,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:38,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,159 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:38,167 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:38,167 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:38,185 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:38,185 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:38,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,254 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 265 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2018-10-22 16:00:38,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,377 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 265 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2018-10-22 16:00:38,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,398 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:38,416 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:38,416 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:38,457 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:38,457 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:38,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,470 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 265 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2018-10-22 16:00:38,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,489 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 265 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2018-10-22 16:00:38,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:38,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-10-22 16:00:38,491 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:38,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:00:38,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:00:38,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:00:38,493 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 12 states. [2018-10-22 16:00:39,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,409 INFO L93 Difference]: Finished difference Result 147 states and 163 transitions. [2018-10-22 16:00:39,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:00:39,410 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-10-22 16:00:39,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,411 INFO L225 Difference]: With dead ends: 147 [2018-10-22 16:00:39,411 INFO L226 Difference]: Without dead ends: 100 [2018-10-22 16:00:39,413 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 242 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=281, Invalid=1441, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:00:39,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-22 16:00:39,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 87. [2018-10-22 16:00:39,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-22 16:00:39,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2018-10-22 16:00:39,426 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 63 [2018-10-22 16:00:39,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,426 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2018-10-22 16:00:39,426 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:00:39,426 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2018-10-22 16:00:39,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-22 16:00:39,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,429 INFO L375 BasicCegarLoop]: trace histogram [30, 25, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,429 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1018602340, now seen corresponding path program 6 times [2018-10-22 16:00:39,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:39,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,431 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,670 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 0 proven. 760 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-22 16:00:39,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,671 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:39,671 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:39,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:39,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,671 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:39,679 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:39,679 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:39,882 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-22 16:00:39,883 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,355 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 524 proven. 30 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2018-10-22 16:00:40,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,526 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 524 proven. 30 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2018-10-22 16:00:40,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,547 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:40,563 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:40,564 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:40,842 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-22 16:00:40,842 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:40,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 524 proven. 30 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2018-10-22 16:00:40,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 524 proven. 30 refuted. 0 times theorem prover too weak. 356 trivial. 0 not checked. [2018-10-22 16:00:40,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:40,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-10-22 16:00:40,936 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:40,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:00:40,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:00:40,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:40,941 INFO L87 Difference]: Start difference. First operand 87 states and 92 transitions. Second operand 14 states. [2018-10-22 16:00:42,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:42,348 INFO L93 Difference]: Finished difference Result 197 states and 216 transitions. [2018-10-22 16:00:42,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-22 16:00:42,351 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 86 [2018-10-22 16:00:42,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:42,352 INFO L225 Difference]: With dead ends: 197 [2018-10-22 16:00:42,352 INFO L226 Difference]: Without dead ends: 129 [2018-10-22 16:00:42,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 332 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=426, Invalid=2654, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:00:42,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-22 16:00:42,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 114. [2018-10-22 16:00:42,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-22 16:00:42,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 120 transitions. [2018-10-22 16:00:42,370 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 120 transitions. Word has length 86 [2018-10-22 16:00:42,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:42,370 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 120 transitions. [2018-10-22 16:00:42,370 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:00:42,371 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 120 transitions. [2018-10-22 16:00:42,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-22 16:00:42,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:42,373 INFO L375 BasicCegarLoop]: trace histogram [42, 36, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:42,373 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:42,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:42,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1697710310, now seen corresponding path program 7 times [2018-10-22 16:00:42,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:42,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:42,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,375 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:42,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:42,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1779 backedges. 0 proven. 1527 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-10-22 16:00:42,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,613 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:42,613 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:42,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:42,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,613 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:42,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:42,621 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:42,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:42,661 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1779 backedges. 0 proven. 1569 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-10-22 16:00:42,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1779 backedges. 0 proven. 1527 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-10-22 16:00:43,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,165 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:43,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:43,181 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:43,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:43,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1779 backedges. 502 proven. 42 refuted. 0 times theorem prover too weak. 1235 trivial. 0 not checked. [2018-10-22 16:00:43,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1779 backedges. 502 proven. 42 refuted. 0 times theorem prover too weak. 1235 trivial. 0 not checked. [2018-10-22 16:00:43,746 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:43,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15, 9, 9, 9] total 36 [2018-10-22 16:00:43,747 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:43,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:00:43,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:00:43,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:00:43,748 INFO L87 Difference]: Start difference. First operand 114 states and 120 transitions. Second operand 15 states. [2018-10-22 16:00:44,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:44,080 INFO L93 Difference]: Finished difference Result 151 states and 159 transitions. [2018-10-22 16:00:44,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:00:44,081 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 113 [2018-10-22 16:00:44,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:44,082 INFO L225 Difference]: With dead ends: 151 [2018-10-22 16:00:44,083 INFO L226 Difference]: Without dead ends: 146 [2018-10-22 16:00:44,084 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 424 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=254, Invalid=1006, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:00:44,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-22 16:00:44,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 131. [2018-10-22 16:00:44,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-22 16:00:44,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 138 transitions. [2018-10-22 16:00:44,101 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 138 transitions. Word has length 113 [2018-10-22 16:00:44,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:44,101 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 138 transitions. [2018-10-22 16:00:44,101 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:00:44,101 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 138 transitions. [2018-10-22 16:00:44,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-22 16:00:44,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:44,104 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:44,104 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:44,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:44,104 INFO L82 PathProgramCache]: Analyzing trace with hash 778877526, now seen corresponding path program 8 times [2018-10-22 16:00:44,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:44,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:44,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,106 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:44,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:44,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-22 16:00:44,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,454 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:44,455 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:44,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:44,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,455 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:44,468 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:44,468 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:44,529 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:44,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,633 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-22 16:00:44,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-22 16:00:44,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,982 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:44,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:44,997 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:45,093 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:45,094 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:45,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-22 16:00:45,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,220 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-10-22 16:00:45,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:45,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:00:45,223 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:45,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:45,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:45,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:45,224 INFO L87 Difference]: Start difference. First operand 131 states and 138 transitions. Second operand 10 states. [2018-10-22 16:00:45,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:45,416 INFO L93 Difference]: Finished difference Result 168 states and 177 transitions. [2018-10-22 16:00:45,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:45,416 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 130 [2018-10-22 16:00:45,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:45,418 INFO L225 Difference]: With dead ends: 168 [2018-10-22 16:00:45,418 INFO L226 Difference]: Without dead ends: 163 [2018-10-22 16:00:45,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 510 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:45,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-22 16:00:45,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 148. [2018-10-22 16:00:45,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-22 16:00:45,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 156 transitions. [2018-10-22 16:00:45,438 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 156 transitions. Word has length 130 [2018-10-22 16:00:45,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:45,439 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 156 transitions. [2018-10-22 16:00:45,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:45,439 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 156 transitions. [2018-10-22 16:00:45,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-22 16:00:45,442 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:45,442 INFO L375 BasicCegarLoop]: trace histogram [56, 48, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:45,442 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:45,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:45,443 INFO L82 PathProgramCache]: Analyzing trace with hash 248319718, now seen corresponding path program 9 times [2018-10-22 16:00:45,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:45,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:45,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,444 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:45,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,771 INFO L134 CoverageAnalysis]: Checked inductivity of 3180 backedges. 0 proven. 2844 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2018-10-22 16:00:45,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,771 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:45,771 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:45,771 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:45,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,771 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:45,780 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:45,780 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:45,933 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 16:00:45,933 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:45,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3180 backedges. 709 proven. 42 refuted. 0 times theorem prover too weak. 2429 trivial. 0 not checked. [2018-10-22 16:00:46,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,472 INFO L134 CoverageAnalysis]: Checked inductivity of 3180 backedges. 709 proven. 42 refuted. 0 times theorem prover too weak. 2429 trivial. 0 not checked. [2018-10-22 16:00:46,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,493 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:46,508 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:46,508 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:46,640 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 16:00:46,640 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:46,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3180 backedges. 709 proven. 42 refuted. 0 times theorem prover too weak. 2429 trivial. 0 not checked. [2018-10-22 16:00:46,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3180 backedges. 709 proven. 42 refuted. 0 times theorem prover too weak. 2429 trivial. 0 not checked. [2018-10-22 16:00:46,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:46,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9, 9, 9] total 25 [2018-10-22 16:00:46,731 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:46,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:00:46,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:00:46,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=510, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:46,733 INFO L87 Difference]: Start difference. First operand 148 states and 156 transitions. Second operand 18 states. [2018-10-22 16:00:49,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:49,455 INFO L93 Difference]: Finished difference Result 327 states and 355 transitions. [2018-10-22 16:00:49,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-22 16:00:49,455 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 147 [2018-10-22 16:00:49,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:49,457 INFO L225 Difference]: With dead ends: 327 [2018-10-22 16:00:49,457 INFO L226 Difference]: Without dead ends: 200 [2018-10-22 16:00:49,460 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 574 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=729, Invalid=6927, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:00:49,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-22 16:00:49,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 183. [2018-10-22 16:00:49,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-22 16:00:49,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 192 transitions. [2018-10-22 16:00:49,478 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 192 transitions. Word has length 147 [2018-10-22 16:00:49,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:49,479 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 192 transitions. [2018-10-22 16:00:49,479 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:00:49,479 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 192 transitions. [2018-10-22 16:00:49,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-22 16:00:49,482 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:49,482 INFO L375 BasicCegarLoop]: trace histogram [72, 63, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:49,482 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:49,482 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:49,482 INFO L82 PathProgramCache]: Analyzing trace with hash -1544152048, now seen corresponding path program 10 times [2018-10-22 16:00:49,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:49,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:49,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,484 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:49,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:49,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5238 backedges. 0 proven. 4734 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2018-10-22 16:00:49,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:49,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:49,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:49,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:49,754 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:49,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:49,820 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:49,821 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:49,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:49,977 INFO L134 CoverageAnalysis]: Checked inductivity of 5238 backedges. 2620 proven. 56 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-10-22 16:00:49,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5238 backedges. 2620 proven. 56 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-10-22 16:00:50,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,292 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:50,307 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:50,307 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:50,436 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:50,436 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,478 INFO L134 CoverageAnalysis]: Checked inductivity of 5238 backedges. 2620 proven. 56 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-10-22 16:00:50,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,537 INFO L134 CoverageAnalysis]: Checked inductivity of 5238 backedges. 2620 proven. 56 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-10-22 16:00:50,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:50,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10, 10, 10] total 28 [2018-10-22 16:00:50,540 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:50,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:00:50,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:00:50,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:50,541 INFO L87 Difference]: Start difference. First operand 183 states and 192 transitions. Second operand 20 states. [2018-10-22 16:00:52,793 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-10-22 16:00:53,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:53,757 INFO L93 Difference]: Finished difference Result 401 states and 432 transitions. [2018-10-22 16:00:53,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-22 16:00:53,757 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 182 [2018-10-22 16:00:53,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:53,759 INFO L225 Difference]: With dead ends: 401 [2018-10-22 16:00:53,759 INFO L226 Difference]: Without dead ends: 241 [2018-10-22 16:00:53,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 712 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3185 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=912, Invalid=10644, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:00:53,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-10-22 16:00:53,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 222. [2018-10-22 16:00:53,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-22 16:00:53,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 232 transitions. [2018-10-22 16:00:53,784 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 232 transitions. Word has length 182 [2018-10-22 16:00:53,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:53,784 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 232 transitions. [2018-10-22 16:00:53,785 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:00:53,785 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 232 transitions. [2018-10-22 16:00:53,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-22 16:00:53,788 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:53,788 INFO L375 BasicCegarLoop]: trace histogram [90, 80, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:53,788 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:53,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:53,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1408919706, now seen corresponding path program 11 times [2018-10-22 16:00:53,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:53,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:53,790 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:53,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:53,790 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:53,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:55,006 INFO L134 CoverageAnalysis]: Checked inductivity of 8165 backedges. 0 proven. 7445 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2018-10-22 16:00:55,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:55,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:55,007 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:55,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:55,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:55,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:55,014 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:55,014 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:55,160 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-10-22 16:00:55,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:55,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:55,333 INFO L134 CoverageAnalysis]: Checked inductivity of 8165 backedges. 3790 proven. 72 refuted. 0 times theorem prover too weak. 4303 trivial. 0 not checked. [2018-10-22 16:00:55,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:55,627 INFO L134 CoverageAnalysis]: Checked inductivity of 8165 backedges. 3790 proven. 72 refuted. 0 times theorem prover too weak. 4303 trivial. 0 not checked. [2018-10-22 16:00:55,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:55,657 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:55,681 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:55,681 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:55,815 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-10-22 16:00:55,815 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:55,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:55,847 INFO L134 CoverageAnalysis]: Checked inductivity of 8165 backedges. 3790 proven. 72 refuted. 0 times theorem prover too weak. 4303 trivial. 0 not checked. [2018-10-22 16:00:55,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:55,924 INFO L134 CoverageAnalysis]: Checked inductivity of 8165 backedges. 3790 proven. 72 refuted. 0 times theorem prover too weak. 4303 trivial. 0 not checked. [2018-10-22 16:00:55,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:55,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11, 11, 11] total 31 [2018-10-22 16:00:55,927 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:55,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:00:55,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:00:55,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=818, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:00:55,928 INFO L87 Difference]: Start difference. First operand 222 states and 232 transitions. Second operand 22 states. [2018-10-22 16:00:59,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:59,990 INFO L93 Difference]: Finished difference Result 483 states and 517 transitions. [2018-10-22 16:00:59,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-10-22 16:00:59,990 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 221 [2018-10-22 16:00:59,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:59,992 INFO L225 Difference]: With dead ends: 483 [2018-10-22 16:00:59,992 INFO L226 Difference]: Without dead ends: 286 [2018-10-22 16:00:59,997 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 995 GetRequests, 866 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4886 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1091, Invalid=15679, Unknown=0, NotChecked=0, Total=16770 [2018-10-22 16:00:59,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2018-10-22 16:01:00,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 265. [2018-10-22 16:01:00,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 265 states. [2018-10-22 16:01:00,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 276 transitions. [2018-10-22 16:01:00,019 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 276 transitions. Word has length 221 [2018-10-22 16:01:00,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:00,019 INFO L481 AbstractCegarLoop]: Abstraction has 265 states and 276 transitions. [2018-10-22 16:01:00,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:01:00,020 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 276 transitions. [2018-10-22 16:01:00,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-22 16:01:00,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:00,023 INFO L375 BasicCegarLoop]: trace histogram [110, 99, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:00,023 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:00,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:00,023 INFO L82 PathProgramCache]: Analyzing trace with hash 582952388, now seen corresponding path program 12 times [2018-10-22 16:01:00,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:00,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:00,024 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:00,025 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:00,025 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:00,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:00,466 INFO L134 CoverageAnalysis]: Checked inductivity of 12177 backedges. 0 proven. 11187 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-10-22 16:01:00,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:00,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:00,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:00,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:00,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:00,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:00,475 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:00,475 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:06,435 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:01:06,435 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:06,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:06,710 INFO L134 CoverageAnalysis]: Checked inductivity of 12177 backedges. 5272 proven. 90 refuted. 0 times theorem prover too weak. 6815 trivial. 0 not checked. [2018-10-22 16:01:06,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:07,252 INFO L134 CoverageAnalysis]: Checked inductivity of 12177 backedges. 5272 proven. 90 refuted. 0 times theorem prover too weak. 6815 trivial. 0 not checked. [2018-10-22 16:01:07,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:07,273 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:07,290 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:07,290 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:08,455 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:01:08,456 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:08,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:08,510 INFO L134 CoverageAnalysis]: Checked inductivity of 12177 backedges. 5272 proven. 90 refuted. 0 times theorem prover too weak. 6815 trivial. 0 not checked. [2018-10-22 16:01:08,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:08,640 INFO L134 CoverageAnalysis]: Checked inductivity of 12177 backedges. 5272 proven. 90 refuted. 0 times theorem prover too weak. 6815 trivial. 0 not checked. [2018-10-22 16:01:08,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:08,642 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12, 12, 12] total 34 [2018-10-22 16:01:08,642 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:08,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:01:08,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:01:08,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1002, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:01:08,644 INFO L87 Difference]: Start difference. First operand 265 states and 276 transitions. Second operand 24 states. [2018-10-22 16:01:13,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:13,307 INFO L93 Difference]: Finished difference Result 573 states and 610 transitions. [2018-10-22 16:01:13,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2018-10-22 16:01:13,312 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 264 [2018-10-22 16:01:13,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:13,313 INFO L225 Difference]: With dead ends: 573 [2018-10-22 16:01:13,313 INFO L226 Difference]: Without dead ends: 335 [2018-10-22 16:01:13,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 1036 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7185 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1260, Invalid=22302, Unknown=0, NotChecked=0, Total=23562 [2018-10-22 16:01:13,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2018-10-22 16:01:13,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 312. [2018-10-22 16:01:13,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-10-22 16:01:13,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 324 transitions. [2018-10-22 16:01:13,342 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 324 transitions. Word has length 264 [2018-10-22 16:01:13,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:13,342 INFO L481 AbstractCegarLoop]: Abstraction has 312 states and 324 transitions. [2018-10-22 16:01:13,342 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:01:13,342 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 324 transitions. [2018-10-22 16:01:13,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-10-22 16:01:13,346 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:13,346 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:13,347 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:13,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:13,347 INFO L82 PathProgramCache]: Analyzing trace with hash 2024589542, now seen corresponding path program 13 times [2018-10-22 16:01:13,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:13,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:13,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:13,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:13,348 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:13,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:14,083 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-22 16:01:14,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:14,083 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:14,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:14,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:14,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:14,084 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:14,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:14,092 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:14,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:14,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:14,399 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-22 16:01:14,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:15,225 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-22 16:01:15,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:15,245 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:15,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:15,260 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:15,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:15,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:15,743 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-22 16:01:15,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:16,023 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-10-22 16:01:16,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:16,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:01:16,027 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:16,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:01:16,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:01:16,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:16,028 INFO L87 Difference]: Start difference. First operand 312 states and 324 transitions. Second operand 15 states. [2018-10-22 16:01:17,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:17,381 INFO L93 Difference]: Finished difference Result 365 states and 379 transitions. [2018-10-22 16:01:17,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:01:17,382 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 311 [2018-10-22 16:01:17,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:17,384 INFO L225 Difference]: With dead ends: 365 [2018-10-22 16:01:17,384 INFO L226 Difference]: Without dead ends: 360 [2018-10-22 16:01:17,385 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1258 GetRequests, 1229 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:01:17,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-10-22 16:01:17,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 337. [2018-10-22 16:01:17,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-22 16:01:17,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 350 transitions. [2018-10-22 16:01:17,414 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 350 transitions. Word has length 311 [2018-10-22 16:01:17,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:17,415 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 350 transitions. [2018-10-22 16:01:17,415 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:01:17,415 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 350 transitions. [2018-10-22 16:01:17,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-22 16:01:17,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:17,417 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:17,418 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:17,418 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:17,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1437047234, now seen corresponding path program 14 times [2018-10-22 16:01:17,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:17,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:17,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:17,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:17,419 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:17,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:17,963 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-22 16:01:17,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:17,963 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:17,963 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:17,963 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:17,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:17,964 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:17,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:17,973 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:18,091 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:18,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:18,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:18,278 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-22 16:01:18,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:19,091 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-22 16:01:19,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:19,112 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:19,127 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:19,127 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:19,362 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:19,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:19,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:19,532 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-22 16:01:19,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:19,690 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-10-22 16:01:19,692 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:19,692 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:01:19,692 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:19,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:01:19,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:01:19,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:19,693 INFO L87 Difference]: Start difference. First operand 337 states and 350 transitions. Second operand 16 states. [2018-10-22 16:01:20,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:20,940 INFO L93 Difference]: Finished difference Result 390 states and 405 transitions. [2018-10-22 16:01:20,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:01:20,940 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 336 [2018-10-22 16:01:20,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:20,942 INFO L225 Difference]: With dead ends: 390 [2018-10-22 16:01:20,943 INFO L226 Difference]: Without dead ends: 385 [2018-10-22 16:01:20,943 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1359 GetRequests, 1328 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:01:20,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2018-10-22 16:01:20,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 362. [2018-10-22 16:01:20,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 362 states. [2018-10-22 16:01:20,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 376 transitions. [2018-10-22 16:01:20,974 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 376 transitions. Word has length 336 [2018-10-22 16:01:20,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:20,975 INFO L481 AbstractCegarLoop]: Abstraction has 362 states and 376 transitions. [2018-10-22 16:01:20,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:01:20,975 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 376 transitions. [2018-10-22 16:01:20,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2018-10-22 16:01:20,977 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:20,978 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:20,978 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:20,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:20,978 INFO L82 PathProgramCache]: Analyzing trace with hash 163314662, now seen corresponding path program 15 times [2018-10-22 16:01:20,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:20,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:20,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:20,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:20,979 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:21,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:21,690 INFO L134 CoverageAnalysis]: Checked inductivity of 23863 backedges. 0 proven. 22323 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-22 16:01:21,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:21,691 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:21,691 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:21,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:21,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:21,691 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:21,700 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:21,700 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown