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-lit/gj2007_true-unreach-call_true-termination.c.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:08:31,040 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:08:31,042 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:08:31,059 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:08:31,060 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:08:31,061 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:08:31,062 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:08:31,064 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:08:31,065 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:08:31,066 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:08:31,067 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:08:31,068 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:08:31,068 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:08:31,069 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:08:31,070 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:08:31,071 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:08:31,072 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:08:31,074 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:08:31,076 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:08:31,077 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:08:31,079 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:08:31,080 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:08:31,082 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:08:31,092 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 16:08:31,120 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:08:31,120 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:08:31,121 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:08:31,121 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:08:31,122 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:08:31,122 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:08:31,122 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:08:31,122 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:08:31,122 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:08:31,123 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:08:31,123 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:08:31,123 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:08:31,124 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:08:31,124 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:08:31,124 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:08:31,124 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:08:31,125 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:08:31,125 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:08:31,125 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:08:31,125 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:08:31,126 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:08:31,126 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:08:31,126 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:08:31,126 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:08:31,126 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:08:31,127 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:08:31,127 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:08:31,127 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:08:31,127 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:08:31,127 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:08:31,128 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:08:31,128 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:08:31,128 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:08:31,128 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:08:31,171 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:08:31,187 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:08:31,191 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:08:31,193 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:08:31,193 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:08:31,194 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-22 16:08:31,264 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8a772c19/09cf248dfb744ada86b2459ba6045a2e/FLAGa69c86894 [2018-10-22 16:08:31,744 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:08:31,745 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007_true-unreach-call_true-termination.c.i [2018-10-22 16:08:31,752 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8a772c19/09cf248dfb744ada86b2459ba6045a2e/FLAGa69c86894 [2018-10-22 16:08:31,767 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8a772c19/09cf248dfb744ada86b2459ba6045a2e [2018-10-22 16:08:31,777 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:08:31,779 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:08:31,780 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:08:31,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:08:31,783 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:08:31,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:08:31" (1/1) ... [2018-10-22 16:08:31,787 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a243cfd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:31, skipping insertion in model container [2018-10-22 16:08:31,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:08:31" (1/1) ... [2018-10-22 16:08:31,797 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:08:31,818 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:08:31,999 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:08:32,004 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:08:32,024 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:08:32,041 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:08:32,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32 WrapperNode [2018-10-22 16:08:32,041 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:08:32,042 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:08:32,042 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:08:32,042 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:08:32,054 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,059 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,065 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:08:32,065 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:08:32,065 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:08:32,065 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:08:32,073 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,073 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,074 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,074 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,078 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,082 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,083 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (1/1) ... [2018-10-22 16:08:32,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:08:32,085 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:08:32,085 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:08:32,086 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:08:32,087 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (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 16:08:32,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:08:32,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:08:32,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:08:32,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:08:32,210 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:08:32,210 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:08:32,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:08:32,211 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:08:32,398 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:08:32,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:08:32 BoogieIcfgContainer [2018-10-22 16:08:32,399 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:08:32,400 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:08:32,400 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:08:32,403 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:08:32,403 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:08:31" (1/3) ... [2018-10-22 16:08:32,404 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19d744d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:08:32, skipping insertion in model container [2018-10-22 16:08:32,404 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:32" (2/3) ... [2018-10-22 16:08:32,405 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19d744d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:08:32, skipping insertion in model container [2018-10-22 16:08:32,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:08:32" (3/3) ... [2018-10-22 16:08:32,407 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007_true-unreach-call_true-termination.c.i [2018-10-22 16:08:32,416 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:08:32,423 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:08:32,436 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:08:32,465 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:08:32,466 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:08:32,466 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:08:32,466 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:08:32,466 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:08:32,467 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:08:32,467 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:08:32,467 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:08:32,467 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:08:32,485 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-22 16:08:32,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:08:32,492 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:32,493 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:32,495 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:32,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:32,502 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2018-10-22 16:08:32,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:32,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:32,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,555 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:32,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:32,608 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 16:08:32,610 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:08:32,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:08:32,610 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:32,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:08:32,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:08:32,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:08:32,628 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-22 16:08:32,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:32,649 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-22 16:08:32,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:08:32,650 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:08:32,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:32,658 INFO L225 Difference]: With dead ends: 32 [2018-10-22 16:08:32,658 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:08:32,662 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 16:08:32,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:08:32,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:08:32,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:08:32,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-22 16:08:32,701 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-22 16:08:32,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:32,702 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-22 16:08:32,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:08:32,702 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-22 16:08:32,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:08:32,703 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:32,703 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:32,704 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:32,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:32,704 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-10-22 16:08:32,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:32,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:32,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,706 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:32,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:32,810 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 16:08:32,811 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:08:32,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:08:32,811 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:32,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:08:32,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:08:32,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:08:32,814 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-22 16:08:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:32,939 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-22 16:08:32,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:08:32,940 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:08:32,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:32,941 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:08:32,941 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:08:32,946 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 16:08:32,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:08:32,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:08:32,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:08:32,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-22 16:08:32,952 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-22 16:08:32,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:32,955 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-22 16:08:32,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:08:32,955 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-22 16:08:32,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:08:32,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:32,956 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:32,957 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:32,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:32,957 INFO L82 PathProgramCache]: Analyzing trace with hash 64649018, now seen corresponding path program 1 times [2018-10-22 16:08:32,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:32,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:32,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:32,959 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:32,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:33,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:33,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,091 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:33,092 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:08:33,094 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [27], [30], [32], [38], [39], [40], [42] [2018-10-22 16:08:33,140 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:08:33,140 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:08:33,341 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-22 16:08:33,343 INFO L272 AbstractInterpreter]: Visited 9 different actions 41 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-22 16:08:33,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:33,373 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-22 16:08:33,430 INFO L224 lantSequenceWeakener]: Could never weaken! [2018-10-22 16:08:33,431 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-22 16:08:33,463 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-22 16:08:33,464 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:08:33,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2018-10-22 16:08:33,464 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:33,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:08:33,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:08:33,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:08:33,470 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 3 states. [2018-10-22 16:08:33,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:33,553 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2018-10-22 16:08:33,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:08:33,553 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-10-22 16:08:33,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:33,554 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:08:33,554 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:08:33,555 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 13 GetRequests, 12 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 16:08:33,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:08:33,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:08:33,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:08:33,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-22 16:08:33,562 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2018-10-22 16:08:33,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:33,562 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-22 16:08:33,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:08:33,562 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-22 16:08:33,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:08:33,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:33,564 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:33,564 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:33,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:33,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1506199393, now seen corresponding path program 1 times [2018-10-22 16:08:33,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:33,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:33,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:33,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:33,566 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:33,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:33,656 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:33,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,657 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:33,657 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-22 16:08:33,657 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [27], [30], [32], [38], [39], [40], [42] [2018-10-22 16:08:33,659 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:08:33,659 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:08:33,758 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:08:33,759 INFO L272 AbstractInterpreter]: Visited 14 different actions 67 times. Merged at 5 different actions 31 times. Widened at 2 different actions 6 times. Found 4 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-22 16:08:33,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:33,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:08:33,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,773 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 16:08:33,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:33,783 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:33,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:33,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:33,829 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:33,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:33,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:33,965 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 16:08:33,982 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:33,982 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:33,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:34,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,006 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:34,048 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:08:34,048 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:34,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:08:34,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:08:34,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:08:34,049 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2018-10-22 16:08:34,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:34,148 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:08:34,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:08:34,148 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-10-22 16:08:34,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:34,149 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:08:34,149 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:08:34,151 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:08:34,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:08:34,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:08:34,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:08:34,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-22 16:08:34,160 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2018-10-22 16:08:34,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:34,160 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-22 16:08:34,160 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:08:34,160 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-22 16:08:34,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:08:34,162 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:34,162 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:34,162 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:34,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:34,163 INFO L82 PathProgramCache]: Analyzing trace with hash 1748455324, now seen corresponding path program 2 times [2018-10-22 16:08:34,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:34,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:34,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:34,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:34,165 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:34,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:34,304 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,305 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:34,305 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:34,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:34,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,306 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) [2018-10-22 16:08:34,319 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:34,320 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:34,366 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:34,366 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:34,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,540 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 16:08:34,574 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:34,574 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:34,593 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:34,594 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:34,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,603 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,648 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:34,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:08:34,650 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:34,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:08:34,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:08:34,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:08:34,652 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2018-10-22 16:08:34,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:34,702 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-22 16:08:34,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:08:34,703 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-10-22 16:08:34,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:34,704 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:08:34,704 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:08:34,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:08:34,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:08:34,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-22 16:08:34,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 16:08:34,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-22 16:08:34,714 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2018-10-22 16:08:34,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:34,715 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-22 16:08:34,715 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:08:34,715 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-22 16:08:34,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:08:34,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:34,717 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:34,717 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:34,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:34,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1045128831, now seen corresponding path program 3 times [2018-10-22 16:08:34,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:34,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:34,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:34,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:34,721 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:34,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:34,793 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:34,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,794 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:34,794 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:34,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:34,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:34,795 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 16:08:34,810 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:34,810 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:34,820 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:08:34,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:34,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:34,951 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:08:34,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:34,992 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:08:35,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,014 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 16:08:35,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:35,030 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:35,047 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:08:35,048 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:35,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:35,055 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:08:35,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:35,086 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (7)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:08:35,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:35,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4, 4, 4] total 10 [2018-10-22 16:08:35,095 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:35,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:08:35,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:08:35,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:08:35,097 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2018-10-22 16:08:35,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:35,182 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2018-10-22 16:08:35,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:08:35,184 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2018-10-22 16:08:35,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:35,185 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:08:35,185 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:08:35,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:08:35,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:08:35,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-22 16:08:35,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:08:35,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-22 16:08:35,192 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-22 16:08:35,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:35,193 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-22 16:08:35,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:08:35,193 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-22 16:08:35,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:08:35,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:35,195 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:35,196 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:35,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:35,196 INFO L82 PathProgramCache]: Analyzing trace with hash 634861023, now seen corresponding path program 4 times [2018-10-22 16:08:35,196 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:35,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,197 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:35,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,197 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:35,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:35,267 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,268 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:35,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:35,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:35,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,269 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 16:08:35,277 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:35,277 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:35,305 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:35,305 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:35,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:35,315 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:35,672 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,694 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 16:08:35,709 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:35,710 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:35,728 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:35,729 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:35,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:35,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:08:35,767 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:35,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:08:35,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:08:35,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:08:35,769 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 7 states. [2018-10-22 16:08:35,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:35,820 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-22 16:08:35,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:08:35,821 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2018-10-22 16:08:35,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:35,822 INFO L225 Difference]: With dead ends: 46 [2018-10-22 16:08:35,822 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:08:35,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:08:35,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:08:35,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-22 16:08:35,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:08:35,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-22 16:08:35,829 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-22 16:08:35,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:35,829 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-22 16:08:35,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:08:35,830 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-22 16:08:35,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:08:35,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:35,831 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:35,831 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:35,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:35,831 INFO L82 PathProgramCache]: Analyzing trace with hash -1611776614, now seen corresponding path program 5 times [2018-10-22 16:08:35,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:35,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:35,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,833 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:35,956 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:35,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,956 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:35,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:35,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:35,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:35,957 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 16:08:35,971 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:35,971 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:36,002 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-22 16:08:36,002 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:36,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:36,013 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:36,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:36,181 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:36,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,201 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 16:08:36,221 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:36,221 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:36,258 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-22 16:08:36,258 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:36,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:36,270 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:36,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:36,324 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:36,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:36,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:08:36,327 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:36,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:08:36,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:08:36,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:08:36,329 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 8 states. [2018-10-22 16:08:36,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:36,522 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-22 16:08:36,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:08:36,524 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2018-10-22 16:08:36,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:36,525 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:08:36,525 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 16:08:36,526 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:08:36,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 16:08:36,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-22 16:08:36,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:08:36,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-22 16:08:36,533 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-22 16:08:36,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:36,533 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-22 16:08:36,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:08:36,533 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-22 16:08:36,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:08:36,534 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:36,534 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:36,535 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:36,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:36,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1576720383, now seen corresponding path program 6 times [2018-10-22 16:08:36,535 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:36,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:36,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:36,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:36,536 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:36,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:36,653 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:08:36,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,654 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:36,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:36,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:36,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,655 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 16:08:36,662 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:36,662 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:36,678 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:08:36,678 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:36,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:37,009 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:37,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:37,418 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:37,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:37,439 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 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 16:08:37,455 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:37,455 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:37,505 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:08:37,506 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:37,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:37,518 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:37,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:37,554 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:37,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:37,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10, 10, 10] total 25 [2018-10-22 16:08:37,556 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:37,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:08:37,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:08:37,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:08:37,557 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 17 states. [2018-10-22 16:08:37,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:37,829 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2018-10-22 16:08:37,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:08:37,830 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2018-10-22 16:08:37,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:37,833 INFO L225 Difference]: With dead ends: 71 [2018-10-22 16:08:37,834 INFO L226 Difference]: Without dead ends: 58 [2018-10-22 16:08:37,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:08:37,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-22 16:08:37,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-22 16:08:37,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-22 16:08:37,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2018-10-22 16:08:37,845 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 35 [2018-10-22 16:08:37,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:37,846 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2018-10-22 16:08:37,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:08:37,846 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2018-10-22 16:08:37,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:08:37,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:37,848 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:37,848 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:37,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:37,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1775771482, now seen corresponding path program 7 times [2018-10-22 16:08:37,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:37,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:37,850 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:37,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:37,850 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:37,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:38,001 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,001 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,001 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:38,001 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:38,001 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:38,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,002 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 16:08:38,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:38,009 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:38,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:38,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:38,043 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:38,276 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,299 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 16:08:38,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:38,315 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:38,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:38,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:38,359 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:38,400 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 184 proven. 84 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:38,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:08:38,404 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:38,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:08:38,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:08:38,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:38,405 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand 10 states. [2018-10-22 16:08:38,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:38,570 INFO L93 Difference]: Finished difference Result 91 states and 108 transitions. [2018-10-22 16:08:38,570 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:08:38,570 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 56 [2018-10-22 16:08:38,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:38,571 INFO L225 Difference]: With dead ends: 91 [2018-10-22 16:08:38,571 INFO L226 Difference]: Without dead ends: 60 [2018-10-22 16:08:38,572 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:38,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-22 16:08:38,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-22 16:08:38,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:08:38,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2018-10-22 16:08:38,580 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 56 [2018-10-22 16:08:38,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:38,581 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2018-10-22 16:08:38,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:08:38,581 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2018-10-22 16:08:38,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:08:38,582 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:38,583 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:38,583 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:38,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:38,583 INFO L82 PathProgramCache]: Analyzing trace with hash -112911681, now seen corresponding path program 8 times [2018-10-22 16:08:38,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:38,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:38,584 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:38,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:38,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:38,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:38,706 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,706 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:38,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:38,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:38,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,707 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 16:08:38,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:38,714 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:38,737 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:38,737 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:38,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:38,747 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:38,931 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:38,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:38,951 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 16:08:38,968 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:38,969 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:39,007 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:39,008 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:39,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:39,022 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:39,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:39,041 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 207 proven. 108 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:39,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:39,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:08:39,043 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:39,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:08:39,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:08:39,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:39,044 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand 11 states. [2018-10-22 16:08:39,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:39,106 INFO L93 Difference]: Finished difference Result 94 states and 111 transitions. [2018-10-22 16:08:39,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:08:39,107 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 59 [2018-10-22 16:08:39,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:39,108 INFO L225 Difference]: With dead ends: 94 [2018-10-22 16:08:39,108 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 16:08:39,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:39,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 16:08:39,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-22 16:08:39,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:08:39,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2018-10-22 16:08:39,116 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 59 [2018-10-22 16:08:39,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:39,117 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2018-10-22 16:08:39,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:08:39,117 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2018-10-22 16:08:39,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:08:39,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:39,118 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:39,119 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:39,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:39,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1801443014, now seen corresponding path program 9 times [2018-10-22 16:08:39,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:39,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:39,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:39,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:39,121 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:39,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:39,572 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 230 proven. 135 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-22 16:08:39,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:39,573 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:39,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:39,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:39,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:39,573 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 16:08:39,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:39,582 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:39,616 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-22 16:08:39,616 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:39,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:08:40,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,336 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:08:40,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,356 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 16:08:40,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:40,372 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:40,467 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-22 16:08:40,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:08:40,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,494 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 234 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-22 16:08:40,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:40,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11, 11, 11] total 30 [2018-10-22 16:08:40,502 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:40,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:08:40,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:08:40,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:08:40,503 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand 21 states. [2018-10-22 16:08:40,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:40,625 INFO L93 Difference]: Finished difference Result 101 states and 121 transitions. [2018-10-22 16:08:40,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:08:40,625 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 62 [2018-10-22 16:08:40,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:40,626 INFO L225 Difference]: With dead ends: 101 [2018-10-22 16:08:40,626 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:08:40,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:08:40,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:08:40,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-22 16:08:40,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-22 16:08:40,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2018-10-22 16:08:40,637 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 62 [2018-10-22 16:08:40,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:40,637 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2018-10-22 16:08:40,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:08:40,637 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2018-10-22 16:08:40,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-22 16:08:40,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:40,639 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:40,639 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:40,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:40,639 INFO L82 PathProgramCache]: Analyzing trace with hash 348314524, now seen corresponding path program 10 times [2018-10-22 16:08:40,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:40,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:40,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:40,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:40,641 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:40,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:40,786 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:40,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,786 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:40,787 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:40,787 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:40,787 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,787 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 16:08:40,796 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:40,796 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:40,837 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:40,837 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:40,848 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:40,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:41,104 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:41,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:41,124 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 16:08:41,140 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:41,140 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:41,181 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:41,182 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:41,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:41,196 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:41,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:41,276 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 286 proven. 165 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:41,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:41,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:08:41,278 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:41,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:08:41,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:08:41,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:08:41,280 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand 13 states. [2018-10-22 16:08:41,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:41,380 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2018-10-22 16:08:41,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:08:41,382 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2018-10-22 16:08:41,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:41,383 INFO L225 Difference]: With dead ends: 106 [2018-10-22 16:08:41,384 INFO L226 Difference]: Without dead ends: 72 [2018-10-22 16:08:41,385 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:08:41,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-22 16:08:41,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-22 16:08:41,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:08:41,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2018-10-22 16:08:41,398 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 68 [2018-10-22 16:08:41,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:41,399 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2018-10-22 16:08:41,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:08:41,399 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2018-10-22 16:08:41,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:08:41,403 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:41,403 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:41,403 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:41,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:41,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1933633409, now seen corresponding path program 11 times [2018-10-22 16:08:41,404 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:41,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:41,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:41,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:41,405 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:41,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:41,637 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:41,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:41,638 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:41,638 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:41,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:41,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:41,638 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 16:08:41,646 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:41,646 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:41,701 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-22 16:08:41,702 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:41,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:41,717 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:41,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:42,120 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:42,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,141 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 16:08:42,155 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:42,156 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:42,288 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-22 16:08:42,288 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:42,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:42,300 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:42,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:42,318 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 312 proven. 198 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:42,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:42,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:08:42,320 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:42,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:08:42,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:08:42,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:08:42,321 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand 14 states. [2018-10-22 16:08:42,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:42,394 INFO L93 Difference]: Finished difference Result 109 states and 128 transitions. [2018-10-22 16:08:42,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:08:42,394 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2018-10-22 16:08:42,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:42,395 INFO L225 Difference]: With dead ends: 109 [2018-10-22 16:08:42,395 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:08:42,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:08:42,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:08:42,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-10-22 16:08:42,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:08:42,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2018-10-22 16:08:42,403 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 71 [2018-10-22 16:08:42,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:42,403 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2018-10-22 16:08:42,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:08:42,404 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2018-10-22 16:08:42,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:08:42,405 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:42,405 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:42,405 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:42,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:42,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1586817668, now seen corresponding path program 12 times [2018-10-22 16:08:42,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:42,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:42,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:42,407 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:42,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:42,687 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:42,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,687 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:42,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:42,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:42,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:42,688 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 16:08:42,695 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:42,695 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:42,724 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:08:42,724 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:42,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:42,736 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:42,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:43,023 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:43,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:43,044 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 16:08:43,060 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:43,060 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:43,210 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:08:43,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:43,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:43,222 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:43,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:43,294 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 338 proven. 234 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:43,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:43,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:08:43,296 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:43,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:08:43,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:08:43,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:08:43,297 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand 15 states. [2018-10-22 16:08:43,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:43,369 INFO L93 Difference]: Finished difference Result 112 states and 131 transitions. [2018-10-22 16:08:43,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:08:43,369 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 74 [2018-10-22 16:08:43,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:43,371 INFO L225 Difference]: With dead ends: 112 [2018-10-22 16:08:43,371 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 16:08:43,372 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:08:43,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 16:08:43,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-22 16:08:43,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-22 16:08:43,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 87 transitions. [2018-10-22 16:08:43,379 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 87 transitions. Word has length 74 [2018-10-22 16:08:43,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:43,379 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 87 transitions. [2018-10-22 16:08:43,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:08:43,380 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 87 transitions. [2018-10-22 16:08:43,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:08:43,380 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:43,381 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:43,381 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:43,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:43,381 INFO L82 PathProgramCache]: Analyzing trace with hash -538451551, now seen corresponding path program 13 times [2018-10-22 16:08:43,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:43,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:43,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:43,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:43,382 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:43,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:43,654 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:43,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:43,655 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:43,655 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:43,655 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:43,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:43,655 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 16:08:43,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:43,663 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:43,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:43,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:43,695 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:43,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:43,989 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,011 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 16:08:44,025 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:44,025 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:44,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:44,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:44,075 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:44,088 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 364 proven. 273 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,089 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:44,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:08:44,090 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:44,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:08:44,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:08:44,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:08:44,091 INFO L87 Difference]: Start difference. First operand 78 states and 87 transitions. Second operand 16 states. [2018-10-22 16:08:44,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:44,183 INFO L93 Difference]: Finished difference Result 115 states and 134 transitions. [2018-10-22 16:08:44,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:08:44,184 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 77 [2018-10-22 16:08:44,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:44,185 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:08:44,185 INFO L226 Difference]: Without dead ends: 81 [2018-10-22 16:08:44,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:08:44,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-22 16:08:44,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-10-22 16:08:44,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-22 16:08:44,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2018-10-22 16:08:44,193 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 77 [2018-10-22 16:08:44,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:44,193 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2018-10-22 16:08:44,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:08:44,193 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2018-10-22 16:08:44,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-22 16:08:44,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:44,195 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:44,195 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:44,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:44,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1665636516, now seen corresponding path program 14 times [2018-10-22 16:08:44,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:44,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:44,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:44,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:44,197 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:44,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:44,450 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,451 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:44,451 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:44,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:44,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,451 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 16:08:44,459 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:44,459 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:44,482 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:44,482 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:44,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:44,498 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:44,932 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:44,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:44,951 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 16:08:44,969 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:44,969 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:45,016 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:45,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:45,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:45,028 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:45,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:45,045 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 390 proven. 315 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:45,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:45,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:08:45,046 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:45,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:08:45,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:08:45,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:08:45,047 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand 17 states. [2018-10-22 16:08:45,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:45,119 INFO L93 Difference]: Finished difference Result 118 states and 137 transitions. [2018-10-22 16:08:45,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:08:45,121 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 80 [2018-10-22 16:08:45,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:45,122 INFO L225 Difference]: With dead ends: 118 [2018-10-22 16:08:45,122 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 16:08:45,123 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:08:45,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 16:08:45,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-22 16:08:45,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-22 16:08:45,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2018-10-22 16:08:45,129 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 80 [2018-10-22 16:08:45,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:45,130 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2018-10-22 16:08:45,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:08:45,130 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2018-10-22 16:08:45,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-22 16:08:45,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:45,131 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:45,131 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:45,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:45,132 INFO L82 PathProgramCache]: Analyzing trace with hash 716358593, now seen corresponding path program 15 times [2018-10-22 16:08:45,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:45,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:45,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:45,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:45,133 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:45,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:45,363 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 416 proven. 360 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-22 16:08:45,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:45,363 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:45,363 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:45,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:45,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:45,363 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 16:08:45,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:45,372 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:45,395 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-22 16:08:45,396 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:45,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:45,803 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:45,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:46,271 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:46,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:46,291 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 31 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 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:46,305 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:46,306 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:46,398 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-22 16:08:46,398 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:46,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:46,409 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:46,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:46,440 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 435 proven. 126 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-22 16:08:46,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:46,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 12, 12, 12] total 38 [2018-10-22 16:08:46,442 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:46,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:08:46,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:08:46,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:08:46,443 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand 28 states. [2018-10-22 16:08:46,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:46,843 INFO L93 Difference]: Finished difference Result 125 states and 147 transitions. [2018-10-22 16:08:46,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:08:46,844 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 83 [2018-10-22 16:08:46,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:46,845 INFO L225 Difference]: With dead ends: 125 [2018-10-22 16:08:46,845 INFO L226 Difference]: Without dead ends: 91 [2018-10-22 16:08:46,846 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:08:46,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-22 16:08:46,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-22 16:08:46,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:08:46,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2018-10-22 16:08:46,851 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 83 [2018-10-22 16:08:46,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:46,852 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2018-10-22 16:08:46,852 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:08:46,852 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2018-10-22 16:08:46,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:08:46,853 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:46,853 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:46,853 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:46,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:46,853 INFO L82 PathProgramCache]: Analyzing trace with hash 223548959, now seen corresponding path program 16 times [2018-10-22 16:08:46,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:46,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:46,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,855 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:46,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:47,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:47,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,836 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:47,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:47,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:47,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,836 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:47,844 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:47,844 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:47,866 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:47,866 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:47,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:47,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:47,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:48,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:48,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:48,636 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 33 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 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:48,656 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:48,656 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:48,703 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:48,703 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:48,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:48,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:48,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:48,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 493 proven. 408 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:48,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:48,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:08:48,780 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:48,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:08:48,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:08:48,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:08:48,781 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand 19 states. [2018-10-22 16:08:48,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:48,851 INFO L93 Difference]: Finished difference Result 130 states and 151 transitions. [2018-10-22 16:08:48,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:08:48,852 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 89 [2018-10-22 16:08:48,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:48,853 INFO L225 Difference]: With dead ends: 130 [2018-10-22 16:08:48,854 INFO L226 Difference]: Without dead ends: 93 [2018-10-22 16:08:48,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:08:48,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-22 16:08:48,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-10-22 16:08:48,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-22 16:08:48,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2018-10-22 16:08:48,860 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 89 [2018-10-22 16:08:48,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:48,860 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2018-10-22 16:08:48,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:08:48,861 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2018-10-22 16:08:48,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-22 16:08:48,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:48,862 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:48,862 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:48,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:48,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1580850010, now seen corresponding path program 17 times [2018-10-22 16:08:48,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:48,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:48,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:48,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:48,863 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:48,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:49,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:49,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,161 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:49,161 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:49,161 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:49,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,162 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:49,168 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:49,169 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:49,209 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-22 16:08:49,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:49,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:49,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:49,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:49,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,611 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 35 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 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:49,626 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:49,626 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:49,818 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 28 check-sat command(s) [2018-10-22 16:08:49,819 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:49,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:49,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:49,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 522 proven. 459 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:49,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:49,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:08:49,848 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:49,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:08:49,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:08:49,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:08:49,849 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand 20 states. [2018-10-22 16:08:49,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:49,989 INFO L93 Difference]: Finished difference Result 133 states and 154 transitions. [2018-10-22 16:08:49,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:08:49,990 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 92 [2018-10-22 16:08:49,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:49,991 INFO L225 Difference]: With dead ends: 133 [2018-10-22 16:08:49,991 INFO L226 Difference]: Without dead ends: 96 [2018-10-22 16:08:49,992 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:08:49,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-22 16:08:49,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2018-10-22 16:08:49,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-22 16:08:49,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-10-22 16:08:49,998 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 92 [2018-10-22 16:08:49,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:49,998 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-10-22 16:08:49,998 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:08:49,998 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-10-22 16:08:50,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 16:08:50,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:50,000 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 18, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:50,000 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:50,001 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:50,001 INFO L82 PathProgramCache]: Analyzing trace with hash -180631489, now seen corresponding path program 18 times [2018-10-22 16:08:50,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:50,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:50,002 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:50,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:50,002 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:50,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:50,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:50,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:50,226 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:50,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:50,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:50,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:50,226 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:50,234 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:50,234 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:50,278 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-22 16:08:50,279 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:50,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:50,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:50,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:51,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:51,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:51,490 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 37 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 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:51,506 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:51,506 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:51,731 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2018-10-22 16:08:51,731 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:51,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:51,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:51,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:51,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 551 proven. 513 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:51,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:51,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-10-22 16:08:51,766 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:51,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:08:51,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:08:51,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:51,767 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 21 states. [2018-10-22 16:08:51,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:51,869 INFO L93 Difference]: Finished difference Result 136 states and 157 transitions. [2018-10-22 16:08:51,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:08:51,869 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 95 [2018-10-22 16:08:51,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:51,871 INFO L225 Difference]: With dead ends: 136 [2018-10-22 16:08:51,871 INFO L226 Difference]: Without dead ends: 99 [2018-10-22 16:08:51,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 361 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:51,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-22 16:08:51,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-22 16:08:51,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-22 16:08:51,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 109 transitions. [2018-10-22 16:08:51,877 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 109 transitions. Word has length 95 [2018-10-22 16:08:51,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:51,877 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 109 transitions. [2018-10-22 16:08:51,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:08:51,877 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 109 transitions. [2018-10-22 16:08:51,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-22 16:08:51,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:51,878 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 19, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:51,878 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:51,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:51,879 INFO L82 PathProgramCache]: Analyzing trace with hash -565545670, now seen corresponding path program 19 times [2018-10-22 16:08:51,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:51,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:51,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,879 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:51,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:52,189 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:52,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:52,190 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:52,190 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:52,190 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:52,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:52,190 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:52,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:52,199 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:52,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:52,225 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:52,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:52,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:53,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:53,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,082 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 39 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 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:53,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,099 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:53,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:53,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:53,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:53,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 580 proven. 570 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:53,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:53,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-22 16:08:53,180 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:53,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:08:53,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:08:53,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:08:53,181 INFO L87 Difference]: Start difference. First operand 99 states and 109 transitions. Second operand 22 states. [2018-10-22 16:08:53,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:53,302 INFO L93 Difference]: Finished difference Result 139 states and 160 transitions. [2018-10-22 16:08:53,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:08:53,305 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 98 [2018-10-22 16:08:53,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:53,306 INFO L225 Difference]: With dead ends: 139 [2018-10-22 16:08:53,306 INFO L226 Difference]: Without dead ends: 102 [2018-10-22 16:08:53,307 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:08:53,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-22 16:08:53,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-10-22 16:08:53,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-22 16:08:53,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 112 transitions. [2018-10-22 16:08:53,312 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 112 transitions. Word has length 98 [2018-10-22 16:08:53,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:53,313 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 112 transitions. [2018-10-22 16:08:53,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:08:53,313 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 112 transitions. [2018-10-22 16:08:53,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-22 16:08:53,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:53,314 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:53,314 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:53,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,314 INFO L82 PathProgramCache]: Analyzing trace with hash 18768479, now seen corresponding path program 20 times [2018-10-22 16:08:53,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,315 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:53,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,584 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:53,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:53,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:53,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,584 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:53,591 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:53,592 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:53,616 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:53,617 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:53,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:53,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:54,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,219 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 41 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 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:54,234 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:54,234 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:54,283 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:54,284 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:54,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:54,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:54,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 609 proven. 630 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:54,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:54,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-22 16:08:54,324 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:54,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:08:54,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:08:54,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:08:54,325 INFO L87 Difference]: Start difference. First operand 102 states and 112 transitions. Second operand 23 states. [2018-10-22 16:08:54,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:54,440 INFO L93 Difference]: Finished difference Result 142 states and 163 transitions. [2018-10-22 16:08:54,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:08:54,440 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 101 [2018-10-22 16:08:54,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:54,441 INFO L225 Difference]: With dead ends: 142 [2018-10-22 16:08:54,442 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:08:54,443 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 383 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:08:54,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:08:54,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-22 16:08:54,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-22 16:08:54,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 115 transitions. [2018-10-22 16:08:54,449 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 115 transitions. Word has length 101 [2018-10-22 16:08:54,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:54,449 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 115 transitions. [2018-10-22 16:08:54,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:08:54,450 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 115 transitions. [2018-10-22 16:08:54,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-22 16:08:54,450 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:54,450 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 21, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:54,451 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:54,451 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:54,451 INFO L82 PathProgramCache]: Analyzing trace with hash -180869350, now seen corresponding path program 21 times [2018-10-22 16:08:54,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:54,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,452 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:54,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,452 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:54,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:54,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 638 proven. 693 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-22 16:08:54,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,720 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:54,720 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:54,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:54,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,721 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:54,727 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:54,728 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:54,756 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-22 16:08:54,756 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:54,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:08:55,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:08:55,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,573 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 43 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 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:55,596 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:55,596 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:55,714 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-22 16:08:55,714 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:08:55,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 672 proven. 155 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:08:55,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:55,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13, 13, 13] total 46 [2018-10-22 16:08:55,743 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:55,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:08:55,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:08:55,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:08:55,754 INFO L87 Difference]: Start difference. First operand 105 states and 115 transitions. Second operand 35 states. [2018-10-22 16:08:55,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:55,946 INFO L93 Difference]: Finished difference Result 149 states and 173 transitions. [2018-10-22 16:08:55,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:08:55,946 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 104 [2018-10-22 16:08:55,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:55,947 INFO L225 Difference]: With dead ends: 149 [2018-10-22 16:08:55,948 INFO L226 Difference]: Without dead ends: 112 [2018-10-22 16:08:55,949 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:08:55,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-22 16:08:55,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-22 16:08:55,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-22 16:08:55,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 122 transitions. [2018-10-22 16:08:55,956 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 122 transitions. Word has length 104 [2018-10-22 16:08:55,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:55,956 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 122 transitions. [2018-10-22 16:08:55,956 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:08:55,957 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 122 transitions. [2018-10-22 16:08:55,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-22 16:08:55,957 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:55,957 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 22, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:55,958 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:55,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:55,958 INFO L82 PathProgramCache]: Analyzing trace with hash 102799356, now seen corresponding path program 22 times [2018-10-22 16:08:55,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:55,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:55,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,959 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:55,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:56,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:56,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,302 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:56,302 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:56,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:56,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,302 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:56,311 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:56,311 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:56,337 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:56,338 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:56,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:56,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:56,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:56,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,988 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 45 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 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:57,003 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:57,003 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:57,057 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:57,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:57,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:57,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:57,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:57,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 736 proven. 759 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:57,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:57,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-10-22 16:08:57,100 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:57,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:08:57,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:08:57,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:57,101 INFO L87 Difference]: Start difference. First operand 111 states and 122 transitions. Second operand 25 states. [2018-10-22 16:08:57,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:57,194 INFO L93 Difference]: Finished difference Result 154 states and 177 transitions. [2018-10-22 16:08:57,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:08:57,195 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 110 [2018-10-22 16:08:57,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:57,196 INFO L225 Difference]: With dead ends: 154 [2018-10-22 16:08:57,196 INFO L226 Difference]: Without dead ends: 114 [2018-10-22 16:08:57,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 417 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:08:57,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-22 16:08:57,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-10-22 16:08:57,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-22 16:08:57,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 125 transitions. [2018-10-22 16:08:57,203 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 125 transitions. Word has length 110 [2018-10-22 16:08:57,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:57,204 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 125 transitions. [2018-10-22 16:08:57,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:08:57,204 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 125 transitions. [2018-10-22 16:08:57,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-22 16:08:57,205 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:57,205 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 23, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:57,205 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:57,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:57,205 INFO L82 PathProgramCache]: Analyzing trace with hash 1248392609, now seen corresponding path program 23 times [2018-10-22 16:08:57,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:57,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:57,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:57,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:57,206 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:57,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:57,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:57,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:57,557 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:57,557 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:57,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:57,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:57,557 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:57,565 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:57,565 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:57,618 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2018-10-22 16:08:57,618 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:57,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:57,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:57,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:58,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,609 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 47 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 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:58,626 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:58,626 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:58,883 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2018-10-22 16:08:58,883 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:58,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:58,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:58,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 768 proven. 828 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:58,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:58,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-10-22 16:08:58,926 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:58,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:08:58,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:08:58,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:08:58,929 INFO L87 Difference]: Start difference. First operand 114 states and 125 transitions. Second operand 26 states. [2018-10-22 16:08:59,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:59,032 INFO L93 Difference]: Finished difference Result 157 states and 180 transitions. [2018-10-22 16:08:59,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:08:59,032 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 113 [2018-10-22 16:08:59,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:59,034 INFO L225 Difference]: With dead ends: 157 [2018-10-22 16:08:59,034 INFO L226 Difference]: Without dead ends: 117 [2018-10-22 16:08:59,035 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:08:59,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-22 16:08:59,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-22 16:08:59,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-22 16:08:59,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 128 transitions. [2018-10-22 16:08:59,042 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 128 transitions. Word has length 113 [2018-10-22 16:08:59,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:59,042 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 128 transitions. [2018-10-22 16:08:59,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:08:59,042 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 128 transitions. [2018-10-22 16:08:59,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:08:59,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:59,043 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 24, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:59,043 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:59,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:59,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1806858716, now seen corresponding path program 24 times [2018-10-22 16:08:59,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:59,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:59,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,045 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:59,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:59,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 800 proven. 900 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:08:59,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,463 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:59,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:59,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:59,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,464 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:59,471 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:59,471 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:59,548 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-22 16:08:59,548 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:59,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:01,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 852 proven. 805 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:09:01,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 852 proven. 805 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-22 16:09:02,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:02,677 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 49 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 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:02,692 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:02,693 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:03,063 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 35 check-sat command(s) [2018-10-22 16:09:03,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:03,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 884 proven. 737 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:09:03,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:03,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 884 proven. 737 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-10-22 16:09:03,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:03,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26, 25, 25] total 75 [2018-10-22 16:09:03,115 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:03,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:09:03,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:09:03,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:09:03,119 INFO L87 Difference]: Start difference. First operand 117 states and 128 transitions. Second operand 51 states. [2018-10-22 16:09:03,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:03,538 INFO L93 Difference]: Finished difference Result 200 states and 250 transitions. [2018-10-22 16:09:03,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:09:03,538 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 116 [2018-10-22 16:09:03,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:03,539 INFO L225 Difference]: With dead ends: 200 [2018-10-22 16:09:03,539 INFO L226 Difference]: Without dead ends: 160 [2018-10-22 16:09:03,543 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:09:03,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-22 16:09:03,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-22 16:09:03,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-22 16:09:03,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 183 transitions. [2018-10-22 16:09:03,550 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 183 transitions. Word has length 116 [2018-10-22 16:09:03,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:03,550 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 183 transitions. [2018-10-22 16:09:03,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:09:03,551 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 183 transitions. [2018-10-22 16:09:03,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-22 16:09:03,552 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:03,552 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:03,552 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:03,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:03,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1028485830, now seen corresponding path program 25 times [2018-10-22 16:09:03,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:03,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,553 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:03,553 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,553 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:03,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:04,120 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:04,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,120 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:04,120 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:04,120 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:04,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,121 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:04,127 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:04,128 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:04,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:04,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:04,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:04,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:05,237 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:05,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:05,258 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 51 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 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:05,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:05,273 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:05,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:05,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:05,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:05,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:05,561 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 1846 proven. 975 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:05,562 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:05,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 52 [2018-10-22 16:09:05,562 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:05,563 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:09:05,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:09:05,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:05,564 INFO L87 Difference]: Start difference. First operand 159 states and 183 transitions. Second operand 28 states. [2018-10-22 16:09:05,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:05,696 INFO L93 Difference]: Finished difference Result 241 states and 290 transitions. [2018-10-22 16:09:05,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:09:05,696 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 158 [2018-10-22 16:09:05,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:05,697 INFO L225 Difference]: With dead ends: 241 [2018-10-22 16:09:05,697 INFO L226 Difference]: Without dead ends: 162 [2018-10-22 16:09:05,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 604 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:05,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-22 16:09:05,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-10-22 16:09:05,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-22 16:09:05,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 186 transitions. [2018-10-22 16:09:05,706 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 186 transitions. Word has length 158 [2018-10-22 16:09:05,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:05,707 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 186 transitions. [2018-10-22 16:09:05,707 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:09:05,707 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 186 transitions. [2018-10-22 16:09:05,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-22 16:09:05,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:05,708 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 26, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:05,708 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:05,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:05,708 INFO L82 PathProgramCache]: Analyzing trace with hash 127741151, now seen corresponding path program 26 times [2018-10-22 16:09:05,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:05,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:05,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:05,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:05,709 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:05,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:06,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:06,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,227 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:06,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:06,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:06,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,228 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:06,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:06,241 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:06,295 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:06,295 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:06,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:06,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:07,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:07,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:07,980 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 53 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 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:07,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:07,995 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:08,082 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:08,082 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:08,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:08,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:08,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:08,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 1917 proven. 1053 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:08,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:08,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 52 [2018-10-22 16:09:08,275 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:08,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:09:08,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:09:08,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:08,276 INFO L87 Difference]: Start difference. First operand 162 states and 186 transitions. Second operand 29 states. [2018-10-22 16:09:08,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:08,415 INFO L93 Difference]: Finished difference Result 244 states and 293 transitions. [2018-10-22 16:09:08,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:09:08,416 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 161 [2018-10-22 16:09:08,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:08,417 INFO L225 Difference]: With dead ends: 244 [2018-10-22 16:09:08,417 INFO L226 Difference]: Without dead ends: 165 [2018-10-22 16:09:08,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 671 GetRequests, 613 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:08,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-22 16:09:08,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-10-22 16:09:08,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-22 16:09:08,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 189 transitions. [2018-10-22 16:09:08,427 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 189 transitions. Word has length 161 [2018-10-22 16:09:08,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:08,427 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 189 transitions. [2018-10-22 16:09:08,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:09:08,427 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 189 transitions. [2018-10-22 16:09:08,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-22 16:09:08,428 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:08,428 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 27, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:08,428 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:08,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:08,429 INFO L82 PathProgramCache]: Analyzing trace with hash -351981798, now seen corresponding path program 27 times [2018-10-22 16:09:08,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:08,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:08,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:08,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:08,430 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:08,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1988 proven. 1134 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:09:09,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,054 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:09,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:09,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:09,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,055 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:09,062 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:09,062 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:09,124 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-22 16:09:09,124 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:09,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:10,083 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-22 16:09:10,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:11,212 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-22 16:09:11,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,234 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 55 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 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:11,249 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:11,250 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:11,633 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-22 16:09:11,633 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:11,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:11,660 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-22 16:09:11,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:11,700 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 1998 proven. 876 refuted. 0 times theorem prover too weak. 1053 trivial. 0 not checked. [2018-10-22 16:09:11,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:11,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27, 27, 27, 27] total 80 [2018-10-22 16:09:11,701 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:11,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-22 16:09:11,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-22 16:09:11,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:09:11,703 INFO L87 Difference]: Start difference. First operand 165 states and 189 transitions. Second operand 55 states. [2018-10-22 16:09:12,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:12,310 INFO L93 Difference]: Finished difference Result 251 states and 303 transitions. [2018-10-22 16:09:12,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:09:12,311 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 164 [2018-10-22 16:09:12,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:12,312 INFO L225 Difference]: With dead ends: 251 [2018-10-22 16:09:12,312 INFO L226 Difference]: Without dead ends: 172 [2018-10-22 16:09:12,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:09:12,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-22 16:09:12,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-22 16:09:12,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-22 16:09:12,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 196 transitions. [2018-10-22 16:09:12,324 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 196 transitions. Word has length 164 [2018-10-22 16:09:12,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:12,325 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 196 transitions. [2018-10-22 16:09:12,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-22 16:09:12,325 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 196 transitions. [2018-10-22 16:09:12,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-22 16:09:12,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:12,327 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 28, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:12,327 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:12,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:12,327 INFO L82 PathProgramCache]: Analyzing trace with hash 820030844, now seen corresponding path program 28 times [2018-10-22 16:09:12,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:12,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:12,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:12,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:12,329 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:12,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:13,676 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:13,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:13,677 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:13,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:13,677 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:13,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:13,677 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:13,684 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:13,684 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:13,725 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:13,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:13,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:13,748 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:13,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:14,511 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:14,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:14,531 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 57 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 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:14,546 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:14,546 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:14,637 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:14,637 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:14,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:14,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:14,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:14,933 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 2146 proven. 1218 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:14,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:14,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 52 [2018-10-22 16:09:14,935 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:14,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:09:14,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:09:14,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:14,936 INFO L87 Difference]: Start difference. First operand 171 states and 196 transitions. Second operand 31 states. [2018-10-22 16:09:15,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:15,074 INFO L93 Difference]: Finished difference Result 256 states and 307 transitions. [2018-10-22 16:09:15,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:09:15,074 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 170 [2018-10-22 16:09:15,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:15,076 INFO L225 Difference]: With dead ends: 256 [2018-10-22 16:09:15,076 INFO L226 Difference]: Without dead ends: 174 [2018-10-22 16:09:15,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 709 GetRequests, 643 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:15,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-22 16:09:15,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-10-22 16:09:15,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-22 16:09:15,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 199 transitions. [2018-10-22 16:09:15,084 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 199 transitions. Word has length 170 [2018-10-22 16:09:15,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:15,084 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 199 transitions. [2018-10-22 16:09:15,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:09:15,085 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 199 transitions. [2018-10-22 16:09:15,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-22 16:09:15,085 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:15,086 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 29, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:15,086 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:15,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:15,086 INFO L82 PathProgramCache]: Analyzing trace with hash -2109211231, now seen corresponding path program 29 times [2018-10-22 16:09:15,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:15,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:15,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:15,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:15,087 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:15,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:15,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:15,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:15,648 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:15,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:15,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:15,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:15,648 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:15,657 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:15,658 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:15,748 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 55 check-sat command(s) [2018-10-22 16:09:15,748 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:15,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:15,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:15,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:16,544 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:16,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:16,564 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 59 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 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:16,580 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:16,580 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:17,166 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 55 check-sat command(s) [2018-10-22 16:09:17,166 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:17,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:17,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:17,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 2220 proven. 1305 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:17,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:17,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 52 [2018-10-22 16:09:17,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:17,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:09:17,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:09:17,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:17,442 INFO L87 Difference]: Start difference. First operand 174 states and 199 transitions. Second operand 32 states. [2018-10-22 16:09:17,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:17,574 INFO L93 Difference]: Finished difference Result 259 states and 310 transitions. [2018-10-22 16:09:17,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:09:17,574 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 173 [2018-10-22 16:09:17,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:17,575 INFO L225 Difference]: With dead ends: 259 [2018-10-22 16:09:17,575 INFO L226 Difference]: Without dead ends: 177 [2018-10-22 16:09:17,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 652 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:17,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-22 16:09:17,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-22 16:09:17,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-22 16:09:17,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 202 transitions. [2018-10-22 16:09:17,585 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 202 transitions. Word has length 173 [2018-10-22 16:09:17,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:17,585 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 202 transitions. [2018-10-22 16:09:17,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:09:17,586 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 202 transitions. [2018-10-22 16:09:17,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-22 16:09:17,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:17,587 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 30, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:17,587 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:17,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:17,587 INFO L82 PathProgramCache]: Analyzing trace with hash -2014347428, now seen corresponding path program 30 times [2018-10-22 16:09:17,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:17,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:17,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:17,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:17,588 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:17,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:18,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:18,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:18,229 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:18,229 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:18,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:18,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:18,229 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:18,236 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:18,236 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:18,342 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:09:18,342 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:18,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:18,376 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:18,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:19,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:19,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:19,356 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 61 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 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:19,371 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:19,371 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:20,127 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:09:20,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:20,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:20,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:20,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:20,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 2294 proven. 1395 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:20,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:20,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 52 [2018-10-22 16:09:20,534 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:20,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:09:20,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:09:20,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:20,535 INFO L87 Difference]: Start difference. First operand 177 states and 202 transitions. Second operand 33 states. [2018-10-22 16:09:20,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:20,732 INFO L93 Difference]: Finished difference Result 262 states and 313 transitions. [2018-10-22 16:09:20,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:09:20,733 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 176 [2018-10-22 16:09:20,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:20,735 INFO L225 Difference]: With dead ends: 262 [2018-10-22 16:09:20,735 INFO L226 Difference]: Without dead ends: 180 [2018-10-22 16:09:20,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 735 GetRequests, 661 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:20,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-22 16:09:20,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2018-10-22 16:09:20,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-22 16:09:20,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-10-22 16:09:20,745 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 176 [2018-10-22 16:09:20,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:20,745 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-10-22 16:09:20,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:09:20,746 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-10-22 16:09:20,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-22 16:09:20,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:20,747 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 31, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:20,747 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:20,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:20,747 INFO L82 PathProgramCache]: Analyzing trace with hash -2015273023, now seen corresponding path program 31 times [2018-10-22 16:09:20,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:20,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:20,748 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:20,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:20,749 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:20,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:21,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:21,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:21,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:21,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,462 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:21,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:21,470 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:21,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:21,516 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:21,546 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:21,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:22,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:22,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:22,413 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 63 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 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:22,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:22,429 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:22,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:22,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:22,573 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:22,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:23,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 2368 proven. 1488 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:23,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:23,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 52 [2018-10-22 16:09:23,704 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:23,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:09:23,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:09:23,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:23,705 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 34 states. [2018-10-22 16:09:23,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:23,863 INFO L93 Difference]: Finished difference Result 265 states and 316 transitions. [2018-10-22 16:09:23,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:09:23,864 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 179 [2018-10-22 16:09:23,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:23,866 INFO L225 Difference]: With dead ends: 265 [2018-10-22 16:09:23,866 INFO L226 Difference]: Without dead ends: 183 [2018-10-22 16:09:23,867 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 670 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:23,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-22 16:09:23,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2018-10-22 16:09:23,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-22 16:09:23,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 208 transitions. [2018-10-22 16:09:23,874 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 208 transitions. Word has length 179 [2018-10-22 16:09:23,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:23,875 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 208 transitions. [2018-10-22 16:09:23,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:09:23,875 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 208 transitions. [2018-10-22 16:09:23,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-22 16:09:23,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:23,876 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 32, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:23,876 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:23,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:23,877 INFO L82 PathProgramCache]: Analyzing trace with hash 475097404, now seen corresponding path program 32 times [2018-10-22 16:09:23,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:23,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:23,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:23,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:23,878 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:23,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:24,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:24,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:24,382 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:24,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:24,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:24,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:24,383 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:24,390 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:24,391 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:24,432 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:24,432 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:24,435 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:24,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:24,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:25,277 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:25,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:25,297 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 65 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 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:25,312 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:25,313 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:25,408 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:25,408 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:25,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:25,442 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:25,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:25,893 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 2442 proven. 1584 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:25,894 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:25,895 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 52 [2018-10-22 16:09:25,895 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:25,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:09:25,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:09:25,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:25,896 INFO L87 Difference]: Start difference. First operand 183 states and 208 transitions. Second operand 35 states. [2018-10-22 16:09:26,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:26,052 INFO L93 Difference]: Finished difference Result 268 states and 319 transitions. [2018-10-22 16:09:26,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:09:26,058 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 182 [2018-10-22 16:09:26,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:26,059 INFO L225 Difference]: With dead ends: 268 [2018-10-22 16:09:26,059 INFO L226 Difference]: Without dead ends: 186 [2018-10-22 16:09:26,060 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 761 GetRequests, 679 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:26,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-22 16:09:26,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2018-10-22 16:09:26,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-22 16:09:26,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 211 transitions. [2018-10-22 16:09:26,068 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 211 transitions. Word has length 182 [2018-10-22 16:09:26,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:26,068 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 211 transitions. [2018-10-22 16:09:26,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:09:26,068 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 211 transitions. [2018-10-22 16:09:26,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-22 16:09:26,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:26,069 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 33, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:26,069 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:26,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:26,070 INFO L82 PathProgramCache]: Analyzing trace with hash -164582943, now seen corresponding path program 33 times [2018-10-22 16:09:26,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:26,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,071 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:26,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,071 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:26,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:26,661 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2516 proven. 1683 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-22 16:09:26,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,662 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:26,662 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:26,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:26,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,662 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:26,669 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:26,670 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:26,731 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-22 16:09:26,731 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:26,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:27,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-22 16:09:27,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-22 16:09:29,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:29,200 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 67 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 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:29,214 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:29,214 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:29,618 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-22 16:09:29,618 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:29,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:29,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-22 16:09:29,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,815 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 2541 proven. 950 refuted. 0 times theorem prover too weak. 1584 trivial. 0 not checked. [2018-10-22 16:09:29,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:29,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 28, 28, 28, 28] total 86 [2018-10-22 16:09:29,816 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:29,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-22 16:09:29,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-22 16:09:29,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:09:29,818 INFO L87 Difference]: Start difference. First operand 186 states and 211 transitions. Second operand 62 states. [2018-10-22 16:09:30,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:30,271 INFO L93 Difference]: Finished difference Result 275 states and 329 transitions. [2018-10-22 16:09:30,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-22 16:09:30,272 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 185 [2018-10-22 16:09:30,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:30,273 INFO L225 Difference]: With dead ends: 275 [2018-10-22 16:09:30,273 INFO L226 Difference]: Without dead ends: 193 [2018-10-22 16:09:30,274 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 686 SyntacticMatches, 4 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:09:30,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-22 16:09:30,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-22 16:09:30,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-22 16:09:30,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 218 transitions. [2018-10-22 16:09:30,283 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 218 transitions. Word has length 185 [2018-10-22 16:09:30,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:30,283 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 218 transitions. [2018-10-22 16:09:30,283 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-22 16:09:30,283 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 218 transitions. [2018-10-22 16:09:30,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-22 16:09:30,284 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:30,284 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 34, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:30,285 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:30,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:30,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1265979329, now seen corresponding path program 34 times [2018-10-22 16:09:30,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:30,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:30,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:30,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:30,286 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:30,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:31,388 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:31,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,388 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:31,389 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:31,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:31,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,389 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:31,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:31,396 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:31,452 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:31,452 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:31,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:31,490 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:31,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:32,607 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:32,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:32,629 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 69 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 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:32,643 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:32,644 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:32,740 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:32,740 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:32,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:32,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:32,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:33,326 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 2695 proven. 1785 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:33,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:33,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 52 [2018-10-22 16:09:33,328 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:33,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:09:33,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:09:33,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:33,329 INFO L87 Difference]: Start difference. First operand 192 states and 218 transitions. Second operand 37 states. [2018-10-22 16:09:33,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:33,480 INFO L93 Difference]: Finished difference Result 280 states and 333 transitions. [2018-10-22 16:09:33,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:09:33,481 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 191 [2018-10-22 16:09:33,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:33,482 INFO L225 Difference]: With dead ends: 280 [2018-10-22 16:09:33,482 INFO L226 Difference]: Without dead ends: 195 [2018-10-22 16:09:33,483 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 709 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:33,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-22 16:09:33,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2018-10-22 16:09:33,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-22 16:09:33,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 221 transitions. [2018-10-22 16:09:33,489 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 221 transitions. Word has length 191 [2018-10-22 16:09:33,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:33,490 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 221 transitions. [2018-10-22 16:09:33,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:09:33,490 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 221 transitions. [2018-10-22 16:09:33,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-22 16:09:33,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:33,491 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 35, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:33,491 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:33,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:33,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1428773178, now seen corresponding path program 35 times [2018-10-22 16:09:33,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:33,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:33,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:33,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:33,493 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:33,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:34,300 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:34,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:34,301 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:34,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:34,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:34,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:34,301 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:34,308 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:34,308 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:34,402 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2018-10-22 16:09:34,402 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:34,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:34,431 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:34,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:35,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:35,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:35,317 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 71 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 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:35,333 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:35,333 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:36,049 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 62 check-sat command(s) [2018-10-22 16:09:36,049 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:36,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:36,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:36,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:36,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 2772 proven. 1890 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:36,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:36,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 52 [2018-10-22 16:09:36,511 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:36,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:09:36,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:09:36,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:36,516 INFO L87 Difference]: Start difference. First operand 195 states and 221 transitions. Second operand 38 states. [2018-10-22 16:09:36,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:36,633 INFO L93 Difference]: Finished difference Result 283 states and 336 transitions. [2018-10-22 16:09:36,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:09:36,636 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 194 [2018-10-22 16:09:36,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:36,637 INFO L225 Difference]: With dead ends: 283 [2018-10-22 16:09:36,637 INFO L226 Difference]: Without dead ends: 198 [2018-10-22 16:09:36,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 718 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-10-22 16:09:36,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2018-10-22 16:09:36,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-22 16:09:36,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 224 transitions. [2018-10-22 16:09:36,646 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 224 transitions. Word has length 194 [2018-10-22 16:09:36,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:36,647 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 224 transitions. [2018-10-22 16:09:36,647 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:09:36,647 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 224 transitions. [2018-10-22 16:09:36,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-22 16:09:36,648 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:36,648 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 36, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:36,648 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:36,648 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:36,649 INFO L82 PathProgramCache]: Analyzing trace with hash -727987617, now seen corresponding path program 36 times [2018-10-22 16:09:36,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:36,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:36,649 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:36,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:36,650 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:36,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:37,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:37,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:37,607 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:37,607 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:37,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:37,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:37,607 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:37,616 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:37,616 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:37,715 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:09:37,716 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:37,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:37,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:37,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:38,638 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:38,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:38,660 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 73 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 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:38,677 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:38,677 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:39,443 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:09:39,444 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:39,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:39,478 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:39,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:39,941 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 2849 proven. 1998 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:39,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:39,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 52 [2018-10-22 16:09:39,942 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:39,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:09:39,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:09:39,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:39,944 INFO L87 Difference]: Start difference. First operand 198 states and 224 transitions. Second operand 39 states. [2018-10-22 16:09:40,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:40,094 INFO L93 Difference]: Finished difference Result 286 states and 339 transitions. [2018-10-22 16:09:40,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:09:40,094 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 197 [2018-10-22 16:09:40,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:40,095 INFO L225 Difference]: With dead ends: 286 [2018-10-22 16:09:40,095 INFO L226 Difference]: Without dead ends: 201 [2018-10-22 16:09:40,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 825 GetRequests, 727 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:40,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-10-22 16:09:40,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2018-10-22 16:09:40,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-22 16:09:40,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 227 transitions. [2018-10-22 16:09:40,105 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 227 transitions. Word has length 197 [2018-10-22 16:09:40,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,106 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 227 transitions. [2018-10-22 16:09:40,106 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:09:40,106 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 227 transitions. [2018-10-22 16:09:40,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-22 16:09:40,107 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,107 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 37, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,107 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,108 INFO L82 PathProgramCache]: Analyzing trace with hash -78083302, now seen corresponding path program 37 times [2018-10-22 16:09:40,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,108 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:40,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,109 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:43,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,287 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:43,287 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:43,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:43,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,287 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:43,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:43,294 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:43,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,371 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:43,372 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,496 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:44,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,516 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 75 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 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:44,531 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:44,531 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:44,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:44,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,655 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:44,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 2926 proven. 2109 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:45,144 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:45,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 52 [2018-10-22 16:09:45,144 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:45,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:09:45,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:09:45,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:45,145 INFO L87 Difference]: Start difference. First operand 201 states and 227 transitions. Second operand 40 states. [2018-10-22 16:09:45,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:45,378 INFO L93 Difference]: Finished difference Result 289 states and 342 transitions. [2018-10-22 16:09:45,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:09:45,378 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 200 [2018-10-22 16:09:45,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:45,379 INFO L225 Difference]: With dead ends: 289 [2018-10-22 16:09:45,380 INFO L226 Difference]: Without dead ends: 204 [2018-10-22 16:09:45,380 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 736 SyntacticMatches, 52 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:45,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-22 16:09:45,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2018-10-22 16:09:45,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-22 16:09:45,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 230 transitions. [2018-10-22 16:09:45,389 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 230 transitions. Word has length 200 [2018-10-22 16:09:45,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:45,390 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 230 transitions. [2018-10-22 16:09:45,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:09:45,390 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 230 transitions. [2018-10-22 16:09:45,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-22 16:09:45,391 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,391 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 38, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,391 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,392 INFO L82 PathProgramCache]: Analyzing trace with hash -491205505, now seen corresponding path program 38 times [2018-10-22 16:09:45,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:45,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,393 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:47,965 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:47,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,965 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:47,965 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:47,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:47,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,965 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:47,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,973 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:48,020 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:48,021 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,051 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:48,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,325 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:49,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,345 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 77 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 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:49,360 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:49,360 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:49,462 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:49,462 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:49,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:49,495 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:49,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,026 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 3003 proven. 2223 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:50,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:50,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 52 [2018-10-22 16:09:50,027 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:50,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:09:50,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:09:50,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:50,028 INFO L87 Difference]: Start difference. First operand 204 states and 230 transitions. Second operand 41 states. [2018-10-22 16:09:50,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:50,204 INFO L93 Difference]: Finished difference Result 292 states and 345 transitions. [2018-10-22 16:09:50,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 16:09:50,204 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 203 [2018-10-22 16:09:50,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:50,206 INFO L225 Difference]: With dead ends: 292 [2018-10-22 16:09:50,206 INFO L226 Difference]: Without dead ends: 207 [2018-10-22 16:09:50,207 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 851 GetRequests, 745 SyntacticMatches, 56 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1372 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:50,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-22 16:09:50,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-22 16:09:50,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-22 16:09:50,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 233 transitions. [2018-10-22 16:09:50,216 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 233 transitions. Word has length 203 [2018-10-22 16:09:50,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:50,216 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 233 transitions. [2018-10-22 16:09:50,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-22 16:09:50,216 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 233 transitions. [2018-10-22 16:09:50,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-22 16:09:50,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:50,218 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 39, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:50,218 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:50,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:50,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1561515258, now seen corresponding path program 39 times [2018-10-22 16:09:50,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:50,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:50,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,219 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:50,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,380 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3080 proven. 2340 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:09:51,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,380 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:51,380 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:51,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:51,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,380 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:51,387 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:51,387 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:51,453 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-22 16:09:51,453 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:51,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-22 16:09:52,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,150 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-22 16:09:54,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,170 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 79 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 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:54,184 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:54,185 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:54,636 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-22 16:09:54,637 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:54,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,668 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-22 16:09:54,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,885 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 3120 proven. 1027 refuted. 0 times theorem prover too weak. 2223 trivial. 0 not checked. [2018-10-22 16:09:54,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:54,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 29, 29, 29, 29] total 92 [2018-10-22 16:09:54,887 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:54,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-22 16:09:54,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-22 16:09:54,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:09:54,889 INFO L87 Difference]: Start difference. First operand 207 states and 233 transitions. Second operand 69 states. [2018-10-22 16:09:55,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:55,317 INFO L93 Difference]: Finished difference Result 299 states and 355 transitions. [2018-10-22 16:09:55,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-22 16:09:55,317 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 206 [2018-10-22 16:09:55,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:55,318 INFO L225 Difference]: With dead ends: 299 [2018-10-22 16:09:55,318 INFO L226 Difference]: Without dead ends: 214 [2018-10-22 16:09:55,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 766 SyntacticMatches, 8 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:09:55,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-22 16:09:55,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-22 16:09:55,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-22 16:09:55,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 240 transitions. [2018-10-22 16:09:55,328 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 240 transitions. Word has length 206 [2018-10-22 16:09:55,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:55,328 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 240 transitions. [2018-10-22 16:09:55,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-22 16:09:55,328 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 240 transitions. [2018-10-22 16:09:55,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-22 16:09:55,329 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:55,330 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 40, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:55,330 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:55,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:55,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1803489756, now seen corresponding path program 40 times [2018-10-22 16:09:55,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:55,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:55,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:55,331 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:55,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:56,347 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:56,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,348 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:56,348 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:56,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:56,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,348 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:56,358 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:56,358 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:56,407 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:56,408 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:56,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,440 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:56,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,395 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:57,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,418 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 81 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 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:57,433 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:57,434 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:57,540 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:57,541 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:57,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,577 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:57,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 3280 proven. 2460 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:58,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:58,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 52 [2018-10-22 16:09:58,176 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:58,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-22 16:09:58,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-22 16:09:58,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:58,177 INFO L87 Difference]: Start difference. First operand 213 states and 240 transitions. Second operand 43 states. [2018-10-22 16:09:58,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:58,331 INFO L93 Difference]: Finished difference Result 304 states and 359 transitions. [2018-10-22 16:09:58,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:09:58,335 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 212 [2018-10-22 16:09:58,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:58,336 INFO L225 Difference]: With dead ends: 304 [2018-10-22 16:09:58,336 INFO L226 Difference]: Without dead ends: 216 [2018-10-22 16:09:58,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 889 GetRequests, 775 SyntacticMatches, 64 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:58,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2018-10-22 16:09:58,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2018-10-22 16:09:58,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-22 16:09:58,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 243 transitions. [2018-10-22 16:09:58,346 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 243 transitions. Word has length 212 [2018-10-22 16:09:58,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:58,346 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 243 transitions. [2018-10-22 16:09:58,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-22 16:09:58,346 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 243 transitions. [2018-10-22 16:09:58,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-22 16:09:58,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:58,348 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 41, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:58,348 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:58,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:58,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1590205503, now seen corresponding path program 41 times [2018-10-22 16:09:58,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:58,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:58,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:58,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:58,349 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:58,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:59,580 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:59,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,580 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:59,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:59,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:59,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,581 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:59,588 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:59,588 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:59,701 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-22 16:09:59,701 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:59,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,735 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:09:59,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,639 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:00,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,659 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 83 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 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:00,675 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:00,675 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:01,522 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-22 16:10:01,523 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:01,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:01,560 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:01,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:02,227 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 3360 proven. 2583 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:02,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:02,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 52 [2018-10-22 16:10:02,229 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:02,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-22 16:10:02,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-22 16:10:02,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:02,230 INFO L87 Difference]: Start difference. First operand 216 states and 243 transitions. Second operand 44 states. [2018-10-22 16:10:02,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:02,373 INFO L93 Difference]: Finished difference Result 307 states and 362 transitions. [2018-10-22 16:10:02,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-22 16:10:02,374 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 215 [2018-10-22 16:10:02,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:02,375 INFO L225 Difference]: With dead ends: 307 [2018-10-22 16:10:02,375 INFO L226 Difference]: Without dead ends: 219 [2018-10-22 16:10:02,376 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 784 SyntacticMatches, 68 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:02,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-22 16:10:02,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-22 16:10:02,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-22 16:10:02,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 246 transitions. [2018-10-22 16:10:02,385 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 246 transitions. Word has length 215 [2018-10-22 16:10:02,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:02,385 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 246 transitions. [2018-10-22 16:10:02,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-22 16:10:02,385 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 246 transitions. [2018-10-22 16:10:02,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-22 16:10:02,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:02,386 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 42, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:02,387 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:02,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:02,387 INFO L82 PathProgramCache]: Analyzing trace with hash 364481468, now seen corresponding path program 42 times [2018-10-22 16:10:02,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:02,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:02,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:02,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:02,388 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:02,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:03,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:03,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:03,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:03,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:03,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,254 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:03,262 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:03,262 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:03,376 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-22 16:10:03,376 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:03,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:03,425 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:03,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:04,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:04,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:04,667 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 85 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 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:04,682 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:04,682 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:05,618 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-22 16:10:05,619 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:05,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:05,657 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:05,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:06,351 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 3440 proven. 2709 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:06,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:06,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 52 [2018-10-22 16:10:06,353 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:06,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:10:06,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:10:06,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:06,354 INFO L87 Difference]: Start difference. First operand 219 states and 246 transitions. Second operand 45 states. [2018-10-22 16:10:06,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:06,501 INFO L93 Difference]: Finished difference Result 310 states and 365 transitions. [2018-10-22 16:10:06,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:10:06,502 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 218 [2018-10-22 16:10:06,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:06,503 INFO L225 Difference]: With dead ends: 310 [2018-10-22 16:10:06,503 INFO L226 Difference]: Without dead ends: 222 [2018-10-22 16:10:06,504 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 915 GetRequests, 793 SyntacticMatches, 72 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1764 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:06,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-22 16:10:06,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2018-10-22 16:10:06,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-22 16:10:06,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 249 transitions. [2018-10-22 16:10:06,511 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 249 transitions. Word has length 218 [2018-10-22 16:10:06,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:06,511 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 249 transitions. [2018-10-22 16:10:06,511 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:10:06,511 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 249 transitions. [2018-10-22 16:10:06,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-22 16:10:06,512 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:06,512 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 43, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:06,513 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:06,513 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:06,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1277435361, now seen corresponding path program 43 times [2018-10-22 16:10:06,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:06,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:06,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,514 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:06,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:07,730 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:07,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,730 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:07,730 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:07,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:07,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,731 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:07,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:07,738 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:07,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:07,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,826 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:07,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,787 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:08,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,807 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 87 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 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:08,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:08,823 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:08,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:08,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:08,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,001 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 3520 proven. 2838 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:10,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:10,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 52 [2018-10-22 16:10:10,003 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:10,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:10:10,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:10:10,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:10,004 INFO L87 Difference]: Start difference. First operand 222 states and 249 transitions. Second operand 46 states. [2018-10-22 16:10:10,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:10,140 INFO L93 Difference]: Finished difference Result 313 states and 368 transitions. [2018-10-22 16:10:10,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:10:10,141 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 221 [2018-10-22 16:10:10,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:10,142 INFO L225 Difference]: With dead ends: 313 [2018-10-22 16:10:10,143 INFO L226 Difference]: Without dead ends: 225 [2018-10-22 16:10:10,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 928 GetRequests, 802 SyntacticMatches, 76 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1862 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:10,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-10-22 16:10:10,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 225. [2018-10-22 16:10:10,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-10-22 16:10:10,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-10-22 16:10:10,152 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 221 [2018-10-22 16:10:10,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:10,153 INFO L481 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-10-22 16:10:10,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:10:10,153 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-10-22 16:10:10,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-22 16:10:10,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:10,154 INFO L375 BasicCegarLoop]: trace histogram [72, 71, 44, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:10,155 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:10,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:10,155 INFO L82 PathProgramCache]: Analyzing trace with hash -941023844, now seen corresponding path program 44 times [2018-10-22 16:10:10,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:10,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,156 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:10,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,156 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:10,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:11,046 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:11,046 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:11,046 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:11,047 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:11,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:11,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:11,047 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:11,054 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:11,054 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:11,106 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:11,106 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:11,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:11,142 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:11,142 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:12,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:12,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:12,116 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 89 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 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:12,130 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:12,131 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:12,242 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:12,242 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:12,249 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:12,284 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:12,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:13,058 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 3600 proven. 2970 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:13,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:13,059 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 52 [2018-10-22 16:10:13,059 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:13,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-22 16:10:13,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-22 16:10:13,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:13,060 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 47 states. [2018-10-22 16:10:13,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:13,230 INFO L93 Difference]: Finished difference Result 316 states and 371 transitions. [2018-10-22 16:10:13,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-22 16:10:13,230 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 224 [2018-10-22 16:10:13,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:13,232 INFO L225 Difference]: With dead ends: 316 [2018-10-22 16:10:13,232 INFO L226 Difference]: Without dead ends: 228 [2018-10-22 16:10:13,233 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 941 GetRequests, 811 SyntacticMatches, 80 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1960 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:13,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2018-10-22 16:10:13,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2018-10-22 16:10:13,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2018-10-22 16:10:13,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 255 transitions. [2018-10-22 16:10:13,242 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 255 transitions. Word has length 224 [2018-10-22 16:10:13,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:13,243 INFO L481 AbstractCegarLoop]: Abstraction has 228 states and 255 transitions. [2018-10-22 16:10:13,243 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-22 16:10:13,243 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 255 transitions. [2018-10-22 16:10:13,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2018-10-22 16:10:13,244 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:13,244 INFO L375 BasicCegarLoop]: trace histogram [73, 72, 45, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:13,245 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:13,245 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:13,245 INFO L82 PathProgramCache]: Analyzing trace with hash -102449151, now seen corresponding path program 45 times [2018-10-22 16:10:13,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:13,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:13,246 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:13,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:13,246 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:14,557 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3680 proven. 3105 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:10:14,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:14,557 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:14,557 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:14,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:14,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:14,558 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:14,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:14,567 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:14,646 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-22 16:10:14,646 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:14,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:15,974 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-22 16:10:15,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:17,547 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-22 16:10:17,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:17,569 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 91 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 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:17,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:17,584 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:18,040 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-22 16:10:18,040 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:18,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:18,076 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-22 16:10:18,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:18,419 INFO L134 CoverageAnalysis]: Checked inductivity of 7812 backedges. 3735 proven. 1107 refuted. 0 times theorem prover too weak. 2970 trivial. 0 not checked. [2018-10-22 16:10:18,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:18,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 30, 30, 30] total 98 [2018-10-22 16:10:18,420 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:18,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-22 16:10:18,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-22 16:10:18,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-22 16:10:18,422 INFO L87 Difference]: Start difference. First operand 228 states and 255 transitions. Second operand 76 states. [2018-10-22 16:10:19,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:19,060 INFO L93 Difference]: Finished difference Result 323 states and 381 transitions. [2018-10-22 16:10:19,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-22 16:10:19,060 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 227 [2018-10-22 16:10:19,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:19,061 INFO L225 Difference]: With dead ends: 323 [2018-10-22 16:10:19,061 INFO L226 Difference]: Without dead ends: 235 [2018-10-22 16:10:19,062 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 846 SyntacticMatches, 12 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-22 16:10:19,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2018-10-22 16:10:19,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 234. [2018-10-22 16:10:19,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-10-22 16:10:19,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 262 transitions. [2018-10-22 16:10:19,070 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 262 transitions. Word has length 227 [2018-10-22 16:10:19,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:19,070 INFO L481 AbstractCegarLoop]: Abstraction has 234 states and 262 transitions. [2018-10-22 16:10:19,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-22 16:10:19,071 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 262 transitions. [2018-10-22 16:10:19,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-10-22 16:10:19,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:19,072 INFO L375 BasicCegarLoop]: trace histogram [75, 74, 46, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:19,072 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:19,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:19,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1788966879, now seen corresponding path program 46 times [2018-10-22 16:10:19,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:19,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:19,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:19,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:19,073 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,397 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:20,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,398 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:20,398 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:20,398 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:20,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,398 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:20,405 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:20,405 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:20,458 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:20,458 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:20,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,494 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:20,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,409 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:21,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:21,429 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 93 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 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:21,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:21,447 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:21,561 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:21,561 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:21,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:21,600 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:21,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:22,439 INFO L134 CoverageAnalysis]: Checked inductivity of 8251 backedges. 3901 proven. 3243 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:22,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:22,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 52 [2018-10-22 16:10:22,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:22,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-22 16:10:22,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-22 16:10:22,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:22,442 INFO L87 Difference]: Start difference. First operand 234 states and 262 transitions. Second operand 49 states. [2018-10-22 16:10:22,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:22,618 INFO L93 Difference]: Finished difference Result 328 states and 385 transitions. [2018-10-22 16:10:22,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:10:22,619 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 233 [2018-10-22 16:10:22,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:22,621 INFO L225 Difference]: With dead ends: 328 [2018-10-22 16:10:22,621 INFO L226 Difference]: Without dead ends: 237 [2018-10-22 16:10:22,622 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 841 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:22,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-22 16:10:22,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-22 16:10:22,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-22 16:10:22,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 265 transitions. [2018-10-22 16:10:22,630 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 265 transitions. Word has length 233 [2018-10-22 16:10:22,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:22,630 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 265 transitions. [2018-10-22 16:10:22,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-22 16:10:22,631 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 265 transitions. [2018-10-22 16:10:22,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-22 16:10:22,631 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:22,632 INFO L375 BasicCegarLoop]: trace histogram [76, 75, 47, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:22,632 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:22,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:22,632 INFO L82 PathProgramCache]: Analyzing trace with hash 496351002, now seen corresponding path program 47 times [2018-10-22 16:10:22,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:22,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:22,633 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:22,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:22,633 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:22,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:23,741 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:23,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,742 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:23,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:23,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:23,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,742 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:23,753 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:23,753 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:23,880 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 76 check-sat command(s) [2018-10-22 16:10:23,880 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:23,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:25,168 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:25,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,189 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 95 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 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:25,205 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:25,205 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:26,206 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 76 check-sat command(s) [2018-10-22 16:10:26,206 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:26,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,251 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:26,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:27,113 INFO L134 CoverageAnalysis]: Checked inductivity of 8475 backedges. 3984 proven. 3384 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:27,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:27,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 52 [2018-10-22 16:10:27,115 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:27,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-22 16:10:27,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-22 16:10:27,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:27,116 INFO L87 Difference]: Start difference. First operand 237 states and 265 transitions. Second operand 50 states. [2018-10-22 16:10:27,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:27,300 INFO L93 Difference]: Finished difference Result 331 states and 388 transitions. [2018-10-22 16:10:27,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-22 16:10:27,301 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 236 [2018-10-22 16:10:27,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:27,302 INFO L225 Difference]: With dead ends: 331 [2018-10-22 16:10:27,302 INFO L226 Difference]: Without dead ends: 240 [2018-10-22 16:10:27,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 850 SyntacticMatches, 92 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2254 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:27,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-22 16:10:27,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 240. [2018-10-22 16:10:27,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2018-10-22 16:10:27,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 268 transitions. [2018-10-22 16:10:27,313 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 268 transitions. Word has length 236 [2018-10-22 16:10:27,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:27,314 INFO L481 AbstractCegarLoop]: Abstraction has 240 states and 268 transitions. [2018-10-22 16:10:27,314 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-22 16:10:27,314 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 268 transitions. [2018-10-22 16:10:27,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2018-10-22 16:10:27,315 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:27,315 INFO L375 BasicCegarLoop]: trace histogram [77, 76, 48, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:27,316 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:27,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:27,316 INFO L82 PathProgramCache]: Analyzing trace with hash 853535231, now seen corresponding path program 48 times [2018-10-22 16:10:27,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:27,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:27,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:27,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:27,317 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:27,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:28,298 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:28,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,298 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:28,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:28,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:28,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,299 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:28,305 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:28,305 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:28,567 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 76 check-sat command(s) [2018-10-22 16:10:28,568 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:28,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:28,610 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:28,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:29,551 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:29,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:29,571 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 97 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 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:29,586 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:29,586 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:30,718 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 76 check-sat command(s) [2018-10-22 16:10:30,718 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:30,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:30,764 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:30,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,680 INFO L134 CoverageAnalysis]: Checked inductivity of 8702 backedges. 4067 proven. 3528 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:31,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:31,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 52 [2018-10-22 16:10:31,682 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:31,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:10:31,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:10:31,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:31,684 INFO L87 Difference]: Start difference. First operand 240 states and 268 transitions. Second operand 51 states. [2018-10-22 16:10:32,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:32,886 INFO L93 Difference]: Finished difference Result 334 states and 391 transitions. [2018-10-22 16:10:32,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:10:32,886 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 239 [2018-10-22 16:10:32,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:32,889 INFO L225 Difference]: With dead ends: 334 [2018-10-22 16:10:32,890 INFO L226 Difference]: Without dead ends: 243 [2018-10-22 16:10:32,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1005 GetRequests, 859 SyntacticMatches, 96 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:32,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2018-10-22 16:10:32,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2018-10-22 16:10:32,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2018-10-22 16:10:32,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 271 transitions. [2018-10-22 16:10:32,902 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 271 transitions. Word has length 239 [2018-10-22 16:10:32,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:32,902 INFO L481 AbstractCegarLoop]: Abstraction has 243 states and 271 transitions. [2018-10-22 16:10:32,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:10:32,902 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 271 transitions. [2018-10-22 16:10:32,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-10-22 16:10:32,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:32,908 INFO L375 BasicCegarLoop]: trace histogram [78, 77, 49, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:32,908 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:32,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:32,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1200058118, now seen corresponding path program 49 times [2018-10-22 16:10:32,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:32,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:32,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:32,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:32,909 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:32,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:34,165 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:34,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,166 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:34,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:34,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:34,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:34,167 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:34,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:34,176 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:34,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:34,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:34,278 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:34,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:35,608 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:35,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,630 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 99 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 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:35,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:35,645 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:35,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:35,808 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:35,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 8932 backedges. 4150 proven. 3675 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-22 16:10:36,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:36,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 52 [2018-10-22 16:10:36,778 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:36,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:10:36,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:10:36,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:36,779 INFO L87 Difference]: Start difference. First operand 243 states and 271 transitions. Second operand 52 states. [2018-10-22 16:10:36,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:36,972 INFO L93 Difference]: Finished difference Result 337 states and 394 transitions. [2018-10-22 16:10:36,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:10:36,972 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 242 [2018-10-22 16:10:36,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:36,974 INFO L225 Difference]: With dead ends: 337 [2018-10-22 16:10:36,974 INFO L226 Difference]: Without dead ends: 246 [2018-10-22 16:10:36,975 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 868 SyntacticMatches, 100 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:36,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2018-10-22 16:10:36,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 246. [2018-10-22 16:10:36,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-22 16:10:36,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 274 transitions. [2018-10-22 16:10:36,982 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 274 transitions. Word has length 242 [2018-10-22 16:10:36,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:36,982 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 274 transitions. [2018-10-22 16:10:36,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:10:36,982 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 274 transitions. [2018-10-22 16:10:36,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-22 16:10:36,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:36,984 INFO L375 BasicCegarLoop]: trace histogram [79, 78, 50, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:36,984 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:36,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:36,984 INFO L82 PathProgramCache]: Analyzing trace with hash 2009613343, now seen corresponding path program 50 times [2018-10-22 16:10:36,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:36,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:36,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:36,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:36,985 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:36,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 4416 proven. 1365 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-22 16:10:37,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,608 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:37,608 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:37,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:37,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,609 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:37,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:37,616 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:37,674 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:37,674 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:37,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:39,011 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:39,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:41,197 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:41,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:41,217 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 101 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 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:41,232 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:41,232 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:41,355 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:41,355 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:41,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:41,412 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:41,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:42,554 INFO L134 CoverageAnalysis]: Checked inductivity of 9165 backedges. 0 proven. 9165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:42,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:42,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 81, 81, 81, 81] total 102 [2018-10-22 16:10:42,556 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:42,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-22 16:10:42,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-22 16:10:42,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:10:42,558 INFO L87 Difference]: Start difference. First operand 246 states and 274 transitions. Second operand 83 states. [2018-10-22 16:10:43,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:43,159 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-10-22 16:10:43,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-22 16:10:43,160 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 245 [2018-10-22 16:10:43,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:43,161 INFO L225 Difference]: With dead ends: 261 [2018-10-22 16:10:43,161 INFO L226 Difference]: Without dead ends: 256 [2018-10-22 16:10:43,162 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1011 GetRequests, 791 SyntacticMatches, 120 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19604 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:10:43,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2018-10-22 16:10:43,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 255. [2018-10-22 16:10:43,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-10-22 16:10:43,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 286 transitions. [2018-10-22 16:10:43,169 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 286 transitions. Word has length 245 [2018-10-22 16:10:43,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:43,170 INFO L481 AbstractCegarLoop]: Abstraction has 255 states and 286 transitions. [2018-10-22 16:10:43,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-22 16:10:43,170 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 286 transitions. [2018-10-22 16:10:43,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-22 16:10:43,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:43,172 INFO L375 BasicCegarLoop]: trace histogram [82, 81, 50, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:43,172 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:43,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:43,172 INFO L82 PathProgramCache]: Analyzing trace with hash 970419580, now seen corresponding path program 51 times [2018-10-22 16:10:43,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:43,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:43,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:43,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:43,173 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:43,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4848 proven. 1650 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-22 16:10:43,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:43,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:43,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:43,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:43,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:43,862 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 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:43,869 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:43,869 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:43,952 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-22 16:10:43,953 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:43,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:43,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:44,828 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:44,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:44,848 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 103 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 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:44,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:44,863 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:45,433 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-22 16:10:45,433 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:45,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:45,475 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:45,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:45,910 INFO L134 CoverageAnalysis]: Checked inductivity of 9882 backedges. 4750 proven. 1457 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:45,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:45,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 34, 34, 34, 34] total 52 [2018-10-22 16:10:45,912 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:45,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:10:45,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:10:45,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:45,913 INFO L87 Difference]: Start difference. First operand 255 states and 286 transitions. Second operand 36 states. [2018-10-22 16:10:46,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:46,085 INFO L93 Difference]: Finished difference Result 270 states and 307 transitions. [2018-10-22 16:10:46,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:10:46,086 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 254 [2018-10-22 16:10:46,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:46,087 INFO L225 Difference]: With dead ends: 270 [2018-10-22 16:10:46,087 INFO L226 Difference]: Without dead ends: 265 [2018-10-22 16:10:46,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 968 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:46,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-22 16:10:46,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 264. [2018-10-22 16:10:46,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2018-10-22 16:10:46,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 298 transitions. [2018-10-22 16:10:46,097 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 298 transitions. Word has length 254 [2018-10-22 16:10:46,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:46,097 INFO L481 AbstractCegarLoop]: Abstraction has 264 states and 298 transitions. [2018-10-22 16:10:46,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:10:46,097 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 298 transitions. [2018-10-22 16:10:46,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2018-10-22 16:10:46,099 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:46,099 INFO L375 BasicCegarLoop]: trace histogram [85, 84, 50, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:46,099 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:46,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:46,100 INFO L82 PathProgramCache]: Analyzing trace with hash -629900097, now seen corresponding path program 52 times [2018-10-22 16:10:46,100 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:46,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:46,100 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:46,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:46,100 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:46,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:46,796 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 5280 proven. 1962 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-22 16:10:46,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:46,797 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:46,797 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:46,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:46,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:46,797 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 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:46,804 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:46,804 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:46,867 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:46,867 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:46,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:47,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:49,700 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:49,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,720 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 105 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 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:49,735 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:49,736 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:49,867 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:49,867 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:49,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:49,953 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:49,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:51,787 INFO L134 CoverageAnalysis]: Checked inductivity of 10626 backedges. 0 proven. 10626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:51,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 87, 87, 87, 87] total 102 [2018-10-22 16:10:51,790 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:51,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-10-22 16:10:51,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-10-22 16:10:51,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:10:51,792 INFO L87 Difference]: Start difference. First operand 264 states and 298 transitions. Second operand 89 states. [2018-10-22 16:10:52,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:52,580 INFO L93 Difference]: Finished difference Result 279 states and 319 transitions. [2018-10-22 16:10:52,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-10-22 16:10:52,580 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 263 [2018-10-22 16:10:52,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:52,582 INFO L225 Difference]: With dead ends: 279 [2018-10-22 16:10:52,582 INFO L226 Difference]: Without dead ends: 274 [2018-10-22 16:10:52,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1089 GetRequests, 845 SyntacticMatches, 144 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22544 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:10:52,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2018-10-22 16:10:52,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 273. [2018-10-22 16:10:52,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-10-22 16:10:52,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 310 transitions. [2018-10-22 16:10:52,593 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 310 transitions. Word has length 263 [2018-10-22 16:10:52,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:52,593 INFO L481 AbstractCegarLoop]: Abstraction has 273 states and 310 transitions. [2018-10-22 16:10:52,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-10-22 16:10:52,594 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 310 transitions. [2018-10-22 16:10:52,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-10-22 16:10:52,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:52,595 INFO L375 BasicCegarLoop]: trace histogram [88, 87, 50, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:52,596 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:52,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:52,596 INFO L82 PathProgramCache]: Analyzing trace with hash -682563364, now seen corresponding path program 53 times [2018-10-22 16:10:52,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:52,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:52,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,597 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:52,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:53,526 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5712 proven. 2301 refuted. 0 times theorem prover too weak. 3384 trivial. 0 not checked. [2018-10-22 16:10:53,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,526 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:53,526 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:53,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:53,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,527 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 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:53,533 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:53,533 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:53,687 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 88 check-sat command(s) [2018-10-22 16:10:53,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:53,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:54,065 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5662 proven. 3626 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-22 16:10:54,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:54,994 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5662 proven. 3626 refuted. 0 times theorem prover too weak. 2109 trivial. 0 not checked. [2018-10-22 16:10:55,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:55,014 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 107 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 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:55,029 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:55,029 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:56,373 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 88 check-sat command(s) [2018-10-22 16:10:56,373 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:56,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:56,435 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5650 proven. 2072 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:56,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:57,307 INFO L134 CoverageAnalysis]: Checked inductivity of 11397 backedges. 5650 proven. 2072 refuted. 0 times theorem prover too weak. 3675 trivial. 0 not checked. [2018-10-22 16:10:57,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:57,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 52, 52, 40, 40] total 52 [2018-10-22 16:10:57,309 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:57,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:10:57,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:10:57,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:57,311 INFO L87 Difference]: Start difference. First operand 273 states and 310 transitions. Second operand 52 states. [2018-10-22 16:10:57,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:57,682 INFO L93 Difference]: Finished difference Result 317 states and 379 transitions. [2018-10-22 16:10:57,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:10:57,682 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 272 [2018-10-22 16:10:57,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:57,684 INFO L225 Difference]: With dead ends: 317 [2018-10-22 16:10:57,684 INFO L226 Difference]: Without dead ends: 312 [2018-10-22 16:10:57,684 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1128 GetRequests, 990 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1928 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:57,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-22 16:10:57,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2018-10-22 16:10:57,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-10-22 16:10:57,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 362 transitions. [2018-10-22 16:10:57,692 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 362 transitions. Word has length 272 [2018-10-22 16:10:57,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:57,692 INFO L481 AbstractCegarLoop]: Abstraction has 312 states and 362 transitions. [2018-10-22 16:10:57,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:10:57,693 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 362 transitions. [2018-10-22 16:10:57,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-10-22 16:10:57,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:57,694 INFO L375 BasicCegarLoop]: trace histogram [101, 100, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:57,694 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:57,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:57,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1819528257, now seen corresponding path program 54 times [2018-10-22 16:10:57,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:57,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:57,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:57,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:57,695 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:57,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:59,776 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:10:59,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:59,776 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:59,776 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:59,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:59,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:59,776 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 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:59,785 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:59,785 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:59,987 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 101 check-sat command(s) [2018-10-22 16:10:59,987 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:59,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:00,280 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:11:00,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:00,959 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:11:00,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,980 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 109 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 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:00,995 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:00,995 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:02,979 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 101 check-sat command(s) [2018-10-22 16:11:02,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:02,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:03,316 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:11:03,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:03,627 INFO L134 CoverageAnalysis]: Checked inductivity of 15050 backedges. 0 proven. 11225 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:11:03,629 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:03,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55, 55, 55] total 57 [2018-10-22 16:11:03,629 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:03,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-22 16:11:03,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-22 16:11:03,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:11:03,630 INFO L87 Difference]: Start difference. First operand 312 states and 362 transitions. Second operand 55 states. [2018-10-22 16:11:05,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:05,650 INFO L93 Difference]: Finished difference Result 4294 states and 5669 transitions. [2018-10-22 16:11:05,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:11:05,651 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 311 [2018-10-22 16:11:05,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:05,669 INFO L225 Difference]: With dead ends: 4294 [2018-10-22 16:11:05,669 INFO L226 Difference]: Without dead ends: 4289 [2018-10-22 16:11:05,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1298 GetRequests, 1232 SyntacticMatches, 10 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=119, Invalid=3187, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:11:05,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4289 states. [2018-10-22 16:11:05,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4289 to 315. [2018-10-22 16:11:05,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2018-10-22 16:11:05,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 366 transitions. [2018-10-22 16:11:05,745 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 366 transitions. Word has length 311 [2018-10-22 16:11:05,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:05,746 INFO L481 AbstractCegarLoop]: Abstraction has 315 states and 366 transitions. [2018-10-22 16:11:05,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-22 16:11:05,746 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 366 transitions. [2018-10-22 16:11:05,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-22 16:11:05,748 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:05,748 INFO L375 BasicCegarLoop]: trace histogram [102, 101, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:05,748 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:05,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:05,749 INFO L82 PathProgramCache]: Analyzing trace with hash 908591292, now seen corresponding path program 55 times [2018-10-22 16:11:05,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:05,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:05,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:05,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:05,750 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:05,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:07,305 INFO L134 CoverageAnalysis]: Checked inductivity of 15352 backedges. 11527 proven. 0 refuted. 0 times theorem prover too weak. 3825 trivial. 0 not checked. [2018-10-22 16:11:07,305 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:11:07,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2018-10-22 16:11:07,305 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:11:07,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:11:07,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:11:07,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:07,307 INFO L87 Difference]: Start difference. First operand 315 states and 366 transitions. Second operand 52 states. [2018-10-22 16:11:07,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:07,643 INFO L93 Difference]: Finished difference Result 464 states and 564 transitions. [2018-10-22 16:11:07,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:11:07,644 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 314 [2018-10-22 16:11:07,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:07,645 INFO L225 Difference]: With dead ends: 464 [2018-10-22 16:11:07,645 INFO L226 Difference]: Without dead ends: 0 [2018-10-22 16:11:07,646 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:07,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-22 16:11:07,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-22 16:11:07,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-22 16:11:07,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-22 16:11:07,648 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 314 [2018-10-22 16:11:07,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:07,648 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-22 16:11:07,648 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:11:07,649 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-22 16:11:07,649 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-22 16:11:07,654 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-22 16:11:08,472 WARN L179 SmtUtils]: Spent 802.00 ms on a formula simplification. DAG size of input: 1848 DAG size of output: 407 [2018-10-22 16:11:11,247 WARN L179 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 407 DAG size of output: 357 [2018-10-22 16:11:11,266 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-22 16:11:11,266 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-22 16:11:11,266 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-22 16:11:11,266 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-22 16:11:11,266 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-22 16:11:11,266 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-22 16:11:11,267 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 23) the Hoare annotation is: true [2018-10-22 16:11:11,267 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 23) no Hoare annotation was computed. [2018-10-22 16:11:11,267 INFO L425 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-10-22 16:11:11,267 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 19) no Hoare annotation was computed. [2018-10-22 16:11:11,267 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 23) no Hoare annotation was computed. [2018-10-22 16:11:11,267 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 20) no Hoare annotation was computed. [2018-10-22 16:11:11,269 INFO L421 ceAbstractionStarter]: At program point L14-2(lines 13 20) the Hoare annotation is: (or (and (and (<= main_~x~0 99) (<= 99 main_~y~0) (<= main_~y~0 99)) (<= 99 main_~x~0)) (and (and (<= main_~y~0 92) (<= 92 main_~y~0) (<= main_~x~0 92)) (<= 92 main_~x~0)) (and (<= 65 main_~x~0) (and (<= main_~y~0 65) (<= 65 main_~y~0) (<= main_~x~0 65))) (and (and (<= main_~y~0 100) (< 99 main_~y~0)) (<= 100 main_~x~0)) (and (<= 64 main_~x~0) (and (<= main_~x~0 64) (<= 64 main_~y~0) (<= main_~y~0 64))) (and (<= 76 main_~x~0) (and (<= main_~y~0 76) (<= main_~x~0 76) (<= 76 main_~y~0))) (and (<= 87 main_~x~0) (and (<= main_~x~0 87) (<= main_~y~0 87) (<= 87 main_~y~0))) (and (and (<= main_~y~0 78) (<= 78 main_~y~0) (<= main_~x~0 78)) (<= 78 main_~x~0)) (and (<= 72 main_~x~0) (and (<= main_~y~0 72) (<= main_~x~0 72) (<= 72 main_~y~0))) (and (and (<= main_~y~0 69) (<= 69 main_~y~0) (<= main_~x~0 69)) (<= 69 main_~x~0)) (and (<= 60 main_~x~0) (and (<= main_~x~0 60) (<= main_~y~0 60) (<= 60 main_~y~0))) (and (<= 67 main_~x~0) (and (<= main_~y~0 67) (<= main_~x~0 67) (<= 67 main_~y~0))) (and (and (<= main_~y~0 55) (<= 55 main_~y~0) (<= main_~x~0 55)) (<= 55 main_~x~0)) (and (and (<= 73 main_~y~0) (<= main_~x~0 73) (<= main_~y~0 73)) (<= 73 main_~x~0)) (and (<= 66 main_~x~0) (and (<= main_~y~0 66) (<= 66 main_~y~0) (<= main_~x~0 66))) (and (and (<= main_~x~0 70) (<= main_~y~0 70) (<= 70 main_~y~0)) (<= 70 main_~x~0)) (and (and (<= main_~x~0 95) (<= main_~y~0 95) (<= 95 main_~y~0)) (<= 95 main_~x~0)) (and (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= main_~x~0 90)) (<= 90 main_~x~0)) (and (and (<= main_~y~0 59) (<= main_~x~0 59) (<= 59 main_~y~0)) (<= 59 main_~x~0)) (and (<= 85 main_~x~0) (and (<= 85 main_~y~0) (<= main_~x~0 85) (<= main_~y~0 85))) (and (<= 63 main_~x~0) (and (<= main_~y~0 63) (<= main_~x~0 63) (<= 63 main_~y~0))) (and (and (<= main_~y~0 77) (<= main_~x~0 77) (<= 77 main_~y~0)) (<= 77 main_~x~0)) (and (<= 53 main_~x~0) (and (<= main_~y~0 53) (<= main_~x~0 53) (<= 53 main_~y~0))) (and (and (<= main_~x~0 79) (<= main_~y~0 79) (<= 79 main_~y~0)) (<= 79 main_~x~0)) (and (<= 68 main_~x~0) (and (<= 68 main_~y~0) (<= main_~y~0 68) (<= main_~x~0 68))) (and (<= 54 main_~x~0) (and (<= main_~x~0 54) (<= 54 main_~y~0) (<= main_~y~0 54))) (and (<= 51 main_~x~0) (and (<= 51 main_~y~0) (<= main_~x~0 51) (<= main_~y~0 51))) (and (and (<= 56 main_~y~0) (<= main_~x~0 56) (<= main_~y~0 56)) (<= 56 main_~x~0)) (and (<= 61 main_~x~0) (and (<= main_~y~0 61) (<= 61 main_~y~0) (<= main_~x~0 61))) (and (<= 88 main_~x~0) (and (<= main_~x~0 88) (<= main_~y~0 88) (<= 88 main_~y~0))) (and (<= main_~y~0 50) (<= main_~x~0 50) (<= 50 main_~y~0)) (and (<= 80 main_~x~0) (and (<= main_~x~0 80) (<= 80 main_~y~0) (<= main_~y~0 80))) (and (<= 94 main_~x~0) (and (<= main_~x~0 94) (<= main_~y~0 94) (<= 94 main_~y~0))) (and (<= 89 main_~x~0) (and (<= 89 main_~y~0) (<= main_~y~0 89) (<= main_~x~0 89))) (and (and (<= 86 main_~y~0) (<= main_~x~0 86) (<= main_~y~0 86)) (<= 86 main_~x~0)) (and (<= 58 main_~x~0) (and (<= main_~x~0 58) (<= main_~y~0 58) (<= 58 main_~y~0))) (and (and (<= main_~x~0 91) (<= 91 main_~y~0) (<= main_~y~0 91)) (<= 91 main_~x~0)) (and (and (<= 52 main_~y~0) (<= main_~y~0 52) (<= main_~x~0 52)) (<= 52 main_~x~0)) (and (<= 93 main_~x~0) (and (<= main_~x~0 93) (<= 93 main_~y~0) (<= main_~y~0 93))) (and (<= 74 main_~x~0) (and (<= 74 main_~y~0) (<= main_~y~0 74) (<= main_~x~0 74))) (and (and (<= main_~y~0 71) (<= main_~x~0 71) (<= 71 main_~y~0)) (<= 71 main_~x~0)) (and (<= 57 main_~x~0) (and (<= 57 main_~y~0) (<= main_~x~0 57) (<= main_~y~0 57))) (and (<= 97 main_~x~0) (and (<= 97 main_~y~0) (<= main_~x~0 97) (<= main_~y~0 97))) (and (and (<= main_~x~0 81) (<= 81 main_~y~0) (<= main_~y~0 81)) (<= 81 main_~x~0)) (and (<= 84 main_~x~0) (and (<= main_~y~0 84) (<= 84 main_~y~0) (<= main_~x~0 84))) (and (and (<= 96 main_~y~0) (<= main_~x~0 96) (<= main_~y~0 96)) (<= 96 main_~x~0)) (and (<= 83 main_~x~0) (and (<= main_~y~0 83) (<= 83 main_~y~0) (<= main_~x~0 83))) (and (<= 62 main_~x~0) (and (<= main_~y~0 62) (<= main_~x~0 62) (<= 62 main_~y~0))) (and (and (<= main_~x~0 98) (<= main_~y~0 98) (<= 98 main_~y~0)) (<= 98 main_~x~0)) (and (and (<= 75 main_~y~0) (<= main_~x~0 75) (<= main_~y~0 75)) (<= 75 main_~x~0)) (and (and (<= 82 main_~y~0) (<= main_~y~0 82) (<= main_~x~0 82)) (<= 82 main_~x~0))) [2018-10-22 16:11:11,269 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 20) the Hoare annotation is: (and (<= main_~y~0 100) (< 99 main_~y~0)) [2018-10-22 16:11:11,270 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-22 16:11:11,270 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-22 16:11:11,270 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-22 16:11:11,270 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-22 16:11:11,270 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-22 16:11:11,270 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-22 16:11:11,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:11:11 BoogieIcfgContainer [2018-10-22 16:11:11,301 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:11:11,304 INFO L168 Benchmark]: Toolchain (without parser) took 159525.86 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 944.2 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -335.7 MB). Peak memory consumption was 608.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:11,304 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:11:11,305 INFO L168 Benchmark]: CACSL2BoogieTranslator took 262.12 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:11,305 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.82 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:11:11,305 INFO L168 Benchmark]: Boogie Preprocessor took 19.77 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:11:11,310 INFO L168 Benchmark]: RCFGBuilder took 313.61 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 727.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -780.2 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:11,310 INFO L168 Benchmark]: TraceAbstraction took 158903.18 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 216.5 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 434.0 MB). Peak memory consumption was 650.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:11:11,315 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 262.12 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.82 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 19.77 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 313.61 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 727.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -780.2 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 158903.18 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 216.5 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 434.0 MB). Peak memory consumption was 650.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((x <= 99 && 99 <= y) && y <= 99) && 99 <= x) || (((y <= 92 && 92 <= y) && x <= 92) && 92 <= x)) || (65 <= x && (y <= 65 && 65 <= y) && x <= 65)) || ((y <= 100 && 99 < y) && 100 <= x)) || (64 <= x && (x <= 64 && 64 <= y) && y <= 64)) || (76 <= x && (y <= 76 && x <= 76) && 76 <= y)) || (87 <= x && (x <= 87 && y <= 87) && 87 <= y)) || (((y <= 78 && 78 <= y) && x <= 78) && 78 <= x)) || (72 <= x && (y <= 72 && x <= 72) && 72 <= y)) || (((y <= 69 && 69 <= y) && x <= 69) && 69 <= x)) || (60 <= x && (x <= 60 && y <= 60) && 60 <= y)) || (67 <= x && (y <= 67 && x <= 67) && 67 <= y)) || (((y <= 55 && 55 <= y) && x <= 55) && 55 <= x)) || (((73 <= y && x <= 73) && y <= 73) && 73 <= x)) || (66 <= x && (y <= 66 && 66 <= y) && x <= 66)) || (((x <= 70 && y <= 70) && 70 <= y) && 70 <= x)) || (((x <= 95 && y <= 95) && 95 <= y) && 95 <= x)) || (((90 <= y && y <= 90) && x <= 90) && 90 <= x)) || (((y <= 59 && x <= 59) && 59 <= y) && 59 <= x)) || (85 <= x && (85 <= y && x <= 85) && y <= 85)) || (63 <= x && (y <= 63 && x <= 63) && 63 <= y)) || (((y <= 77 && x <= 77) && 77 <= y) && 77 <= x)) || (53 <= x && (y <= 53 && x <= 53) && 53 <= y)) || (((x <= 79 && y <= 79) && 79 <= y) && 79 <= x)) || (68 <= x && (68 <= y && y <= 68) && x <= 68)) || (54 <= x && (x <= 54 && 54 <= y) && y <= 54)) || (51 <= x && (51 <= y && x <= 51) && y <= 51)) || (((56 <= y && x <= 56) && y <= 56) && 56 <= x)) || (61 <= x && (y <= 61 && 61 <= y) && x <= 61)) || (88 <= x && (x <= 88 && y <= 88) && 88 <= y)) || ((y <= 50 && x <= 50) && 50 <= y)) || (80 <= x && (x <= 80 && 80 <= y) && y <= 80)) || (94 <= x && (x <= 94 && y <= 94) && 94 <= y)) || (89 <= x && (89 <= y && y <= 89) && x <= 89)) || (((86 <= y && x <= 86) && y <= 86) && 86 <= x)) || (58 <= x && (x <= 58 && y <= 58) && 58 <= y)) || (((x <= 91 && 91 <= y) && y <= 91) && 91 <= x)) || (((52 <= y && y <= 52) && x <= 52) && 52 <= x)) || (93 <= x && (x <= 93 && 93 <= y) && y <= 93)) || (74 <= x && (74 <= y && y <= 74) && x <= 74)) || (((y <= 71 && x <= 71) && 71 <= y) && 71 <= x)) || (57 <= x && (57 <= y && x <= 57) && y <= 57)) || (97 <= x && (97 <= y && x <= 97) && y <= 97)) || (((x <= 81 && 81 <= y) && y <= 81) && 81 <= x)) || (84 <= x && (y <= 84 && 84 <= y) && x <= 84)) || (((96 <= y && x <= 96) && y <= 96) && 96 <= x)) || (83 <= x && (y <= 83 && 83 <= y) && x <= 83)) || (62 <= x && (y <= 62 && x <= 62) && 62 <= y)) || (((x <= 98 && y <= 98) && 98 <= y) && 98 <= x)) || (((75 <= y && x <= 75) && y <= 75) && 75 <= x)) || (((82 <= y && y <= 82) && x <= 82) && 82 <= x) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 158.8s OverallTime, 58 OverallIterations, 102 TraceHistogramMax, 14.5s AutomataDifference, 0.0s DeadEndRemovalTime, 3.6s HoareAnnotationTime, HoareTripleCheckerStatistics: 887 SDtfs, 707 SDslu, 16816 SDs, 0 SdLazy, 8342 SolverSat, 1401 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9.7s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 33760 GetRequests, 29736 SyntacticMatches, 1526 SemanticMatches, 2498 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72565 ImplicationChecksByTransitivity, 106.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=315occurred in iteration=57, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 1.0 AbsIntWeakeningRatio, 0.3076923076923077 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 58 MinimizatonAttempts, 3990 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 64 PreInvPairs, 166 NumberOfFragments, 720 HoareAnnotationTreeSize, 64 FomulaSimplifications, 18367 FormulaSimplificationTreeSizeReduction, 0.8s HoareSimplificationTime, 7 FomulaSimplificationsInter, 200 FormulaSimplificationTreeSizeReductionInter, 2.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.5s SsaConstructionTime, 19.3s SatisfiabilityAnalysisTime, 115.6s InterpolantComputationTime, 24514 NumberOfCodeBlocks, 23530 NumberOfCodeBlocksAsserted, 2454 NumberOfCheckSat, 40350 ConstructedInterpolants, 0 QuantifiedInterpolants, 18639222 SizeOfPredicates, 56 NumberOfNonLiveVariables, 29946 ConjunctsInSsa, 3249 ConjunctsInUnsatCore, 274 InterpolantComputations, 3 PerfectInterpolantSequences, 700096/1151304 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...