java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:02:16,933 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:02:16,935 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:02:16,950 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:02:16,950 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:02:16,952 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:02:16,953 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:02:16,955 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:02:16,958 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:02:16,966 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:02:16,967 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:02:16,967 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:02:16,968 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:02:16,969 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:02:16,972 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:02:16,973 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:02:16,974 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:02:16,976 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:02:16,980 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:02:16,981 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:02:16,984 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:02:16,986 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:02:16,989 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:02:17,002 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 16:02:17,032 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:02:17,032 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:02:17,033 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:02:17,033 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:02:17,033 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:02:17,033 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:02:17,033 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:02:17,034 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:02:17,034 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:02:17,034 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:02:17,034 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:02:17,034 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:02:17,035 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:02:17,035 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:02:17,035 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:02:17,036 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:02:17,036 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:02:17,036 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:02:17,036 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:02:17,036 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:02:17,037 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:02:17,037 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:02:17,037 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:02:17,037 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:02:17,038 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:02:17,038 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:02:17,038 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:02:17,038 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:02:17,038 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:02:17,039 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:02:17,039 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:02:17,039 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:02:17,039 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:02:17,039 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:02:17,081 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:02:17,093 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:02:17,097 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:02:17,099 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:02:17,099 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:02:17,100 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i [2018-10-22 16:02:17,156 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/935454eb1/c82bfdb5a1854bd697db9fa773eb0794/FLAG0fbe4408c [2018-10-22 16:02:17,570 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:02:17,571 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i [2018-10-22 16:02:17,580 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/935454eb1/c82bfdb5a1854bd697db9fa773eb0794/FLAG0fbe4408c [2018-10-22 16:02:17,595 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/935454eb1/c82bfdb5a1854bd697db9fa773eb0794 [2018-10-22 16:02:17,605 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:02:17,607 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:02:17,608 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:02:17,608 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:02:17,613 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:02:17,614 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,617 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72fa15e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17, skipping insertion in model container [2018-10-22 16:02:17,617 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,628 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:02:17,648 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:02:17,816 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:02:17,820 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:02:17,842 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:02:17,863 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:02:17,863 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17 WrapperNode [2018-10-22 16:02:17,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:02:17,865 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:02:17,865 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:02:17,865 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:02:17,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,884 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,905 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:02:17,906 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:02:17,906 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:02:17,906 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:02:17,917 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,917 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,919 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,919 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,924 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,929 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,931 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (1/1) ... [2018-10-22 16:02:17,933 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:02:17,933 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:02:17,933 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:02:17,933 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:02:17,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (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 16:02:18,063 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:02:18,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:02:18,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:02:18,064 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:02:18,064 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:02:18,064 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:02:18,064 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:02:18,064 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:02:18,627 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:02:18,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:02:18 BoogieIcfgContainer [2018-10-22 16:02:18,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:02:18,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:02:18,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:02:18,633 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:02:18,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:02:17" (1/3) ... [2018-10-22 16:02:18,634 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f3d23b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:02:18, skipping insertion in model container [2018-10-22 16:02:18,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:17" (2/3) ... [2018-10-22 16:02:18,635 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f3d23b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:02:18, skipping insertion in model container [2018-10-22 16:02:18,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:02:18" (3/3) ... [2018-10-22 16:02:18,637 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call4_true-termination.i [2018-10-22 16:02:18,648 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:02:18,656 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:02:18,675 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:02:18,713 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:02:18,714 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:02:18,714 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:02:18,714 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:02:18,715 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:02:18,715 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:02:18,715 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:02:18,715 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:02:18,715 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:02:18,732 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-22 16:02:18,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:02:18,738 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:18,739 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:18,741 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:18,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:18,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-22 16:02:18,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:18,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:18,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,802 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:18,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:18,877 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 16:02:18,879 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:02:18,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:02:18,879 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:02:18,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:02:18,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:02:18,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:02:18,902 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-22 16:02:18,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:18,927 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-22 16:02:18,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:02:18,929 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-22 16:02:18,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:18,936 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:02:18,936 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:02:18,940 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 16:02:18,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:02:18,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:02:18,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:02:18,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-22 16:02:18,978 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-22 16:02:18,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:18,978 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-22 16:02:18,978 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:02:18,979 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-22 16:02:18,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:02:18,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:18,980 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:18,980 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:18,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:18,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-22 16:02:18,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:18,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,982 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:18,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,982 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:19,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:19,103 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 16:02:19,103 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:02:19,103 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:02:19,104 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:02:19,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:02:19,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:02:19,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:02:19,107 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-22 16:02:19,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:19,164 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:02:19,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:02:19,165 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-22 16:02:19,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:19,167 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:02:19,167 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:02:19,168 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 16:02:19,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:02:19,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-22 16:02:19,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:02:19,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-22 16:02:19,175 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-22 16:02:19,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:19,175 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-22 16:02:19,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:02:19,175 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-22 16:02:19,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:02:19,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:19,177 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:19,177 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:19,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:19,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-22 16:02:19,178 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:19,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:19,179 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:19,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:19,259 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 16:02:19,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:19,260 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:19,261 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:02:19,263 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-22 16:02:19,313 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:02:19,313 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:02:19,958 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-22 16:02:19,960 INFO L272 AbstractInterpreter]: Visited 16 different actions 48 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 30 variables. [2018-10-22 16:02:19,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:19,992 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-22 16:02:20,200 INFO L232 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 85.6% of their original sizes. [2018-10-22 16:02:20,201 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-22 16:02:20,470 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-22 16:02:20,471 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:02:20,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2018-10-22 16:02:20,471 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:02:20,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:02:20,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:02:20,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:02:20,473 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2018-10-22 16:02:21,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:21,189 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-22 16:02:21,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:02:21,189 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-22 16:02:21,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:21,190 INFO L225 Difference]: With dead ends: 46 [2018-10-22 16:02:21,191 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 16:02:21,192 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:02:21,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 16:02:21,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2018-10-22 16:02:21,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:02:21,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-22 16:02:21,206 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 18 [2018-10-22 16:02:21,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:21,207 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-22 16:02:21,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:02:21,207 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-22 16:02:21,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-22 16:02:21,211 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:21,211 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:21,212 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:21,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:21,212 INFO L82 PathProgramCache]: Analyzing trace with hash 867262738, now seen corresponding path program 1 times [2018-10-22 16:02:21,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:21,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:21,217 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:21,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:21,217 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:21,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:21,465 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:21,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:21,465 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:21,465 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-22 16:02:21,466 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-22 16:02:21,468 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:02:21,469 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:02:24,503 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:02:24,504 INFO L272 AbstractInterpreter]: Visited 19 different actions 732 times. Merged at 7 different actions 372 times. Widened at 2 different actions 87 times. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-22 16:02:24,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:24,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:02:24,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:24,528 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 16:02:24,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:24,540 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:24,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:24,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:24,757 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:24,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:24,946 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:24,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:24,970 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 16:02:24,997 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:24,997 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:25,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:25,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:25,071 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:25,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:25,116 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:25,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:25,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-10-22 16:02:25,119 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:25,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:02:25,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:02:25,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:02:25,120 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 6 states. [2018-10-22 16:02:25,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:25,285 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-10-22 16:02:25,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:02:25,286 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2018-10-22 16:02:25,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:25,287 INFO L225 Difference]: With dead ends: 53 [2018-10-22 16:02:25,287 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 16:02:25,290 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:02:25,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 16:02:25,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2018-10-22 16:02:25,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 16:02:25,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-10-22 16:02:25,306 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2018-10-22 16:02:25,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:25,306 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-10-22 16:02:25,306 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:02:25,306 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-10-22 16:02:25,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 16:02:25,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:25,311 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:25,311 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:25,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:25,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1046082345, now seen corresponding path program 2 times [2018-10-22 16:02:25,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:25,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:25,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:25,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:25,316 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:25,480 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:25,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:25,480 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:25,481 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:25,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:25,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:25,481 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:25,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:25,490 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:25,549 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:25,549 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:25,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:25,638 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:25,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:25,888 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:25,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:25,917 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 16:02:25,938 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:25,938 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:26,009 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:26,010 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:26,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,023 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:26,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,075 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:26,078 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:26,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-10-22 16:02:26,078 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:26,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:02:26,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:02:26,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:02:26,079 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 7 states. [2018-10-22 16:02:26,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:26,289 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2018-10-22 16:02:26,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:02:26,291 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2018-10-22 16:02:26,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:26,294 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:02:26,294 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:02:26,295 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:02:26,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:02:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2018-10-22 16:02:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-22 16:02:26,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-22 16:02:26,306 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2018-10-22 16:02:26,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:26,307 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-22 16:02:26,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:02:26,307 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-22 16:02:26,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-22 16:02:26,311 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:26,311 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:26,311 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:26,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:26,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1296502514, now seen corresponding path program 3 times [2018-10-22 16:02:26,312 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:26,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:26,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:26,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:26,314 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:26,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:26,493 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:02:26,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,494 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:26,494 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:26,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:26,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,495 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 16:02:26,503 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:26,503 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:26,577 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:02:26,577 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:26,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,670 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:02:26,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,815 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:02:26,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,836 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 16:02:26,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:26,856 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:26,954 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:02:26,955 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:26,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,967 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:02:26,967 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:27,031 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:02:27,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:27,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 16 [2018-10-22 16:02:27,034 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:27,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:02:27,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:02:27,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:02:27,036 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 10 states. [2018-10-22 16:02:27,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:27,465 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2018-10-22 16:02:27,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:02:27,468 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 36 [2018-10-22 16:02:27,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:27,470 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:02:27,470 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 16:02:27,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:02:27,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 16:02:27,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2018-10-22 16:02:27,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-22 16:02:27,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-22 16:02:27,481 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 36 [2018-10-22 16:02:27,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:27,481 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-22 16:02:27,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:02:27,481 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-22 16:02:27,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 16:02:27,482 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:27,482 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:27,484 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:27,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:27,484 INFO L82 PathProgramCache]: Analyzing trace with hash -973804553, now seen corresponding path program 4 times [2018-10-22 16:02:27,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:27,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:27,485 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:27,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:27,485 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:27,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:27,667 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:27,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:27,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:27,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:27,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,668 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 16:02:27,675 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:27,675 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:27,709 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:27,709 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:27,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:27,727 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:27,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:27,825 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:27,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,846 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 16:02:27,861 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:27,862 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:27,944 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:27,944 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:27,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:27,956 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:27,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:27,987 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:27,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:27,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-10-22 16:02:27,991 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:27,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:02:27,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:02:27,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:02:27,992 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 9 states. [2018-10-22 16:02:28,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:28,145 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2018-10-22 16:02:28,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:02:28,146 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2018-10-22 16:02:28,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:28,147 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:02:28,147 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:02:28,148 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:02:28,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:02:28,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2018-10-22 16:02:28,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-22 16:02:28,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-22 16:02:28,156 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2018-10-22 16:02:28,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:28,156 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-22 16:02:28,156 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:02:28,156 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-22 16:02:28,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-22 16:02:28,157 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:28,157 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:28,158 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:28,158 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:28,158 INFO L82 PathProgramCache]: Analyzing trace with hash 368352658, now seen corresponding path program 5 times [2018-10-22 16:02:28,158 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:28,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,159 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:28,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,159 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:28,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:28,289 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:28,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,289 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:28,289 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:28,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:28,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,290 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 16:02:28,303 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:28,303 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:28,361 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:02:28,361 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:28,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:28,395 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:28,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:28,523 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:28,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,545 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 16:02:28,563 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:28,563 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:28,707 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:02:28,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:28,712 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:28,720 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:28,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:28,737 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:28,739 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:28,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-10-22 16:02:28,739 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:28,739 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:02:28,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:02:28,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:02:28,740 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 10 states. [2018-10-22 16:02:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:28,891 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2018-10-22 16:02:28,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:02:28,892 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 48 [2018-10-22 16:02:28,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:28,893 INFO L225 Difference]: With dead ends: 85 [2018-10-22 16:02:28,893 INFO L226 Difference]: Without dead ends: 62 [2018-10-22 16:02:28,894 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:02:28,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-22 16:02:28,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2018-10-22 16:02:28,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 16:02:28,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-10-22 16:02:28,903 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2018-10-22 16:02:28,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:28,903 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-10-22 16:02:28,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:02:28,903 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-10-22 16:02:28,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-22 16:02:28,905 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:28,905 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:28,905 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:28,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:28,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1571700201, now seen corresponding path program 6 times [2018-10-22 16:02:28,906 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:28,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:28,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,907 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:28,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:29,069 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:29,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,069 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:29,069 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:29,069 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:29,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,069 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 16:02:29,077 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:29,077 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:29,144 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:02:29,144 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:29,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:29,159 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:29,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:29,286 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:29,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,310 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 16:02:29,326 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:29,326 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:29,602 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:02:29,602 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:29,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:29,614 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:29,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:29,685 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:29,687 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:29,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-10-22 16:02:29,689 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:29,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:02:29,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:02:29,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:02:29,690 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 11 states. [2018-10-22 16:02:29,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:29,812 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2018-10-22 16:02:29,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:02:29,812 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 51 [2018-10-22 16:02:29,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:29,813 INFO L225 Difference]: With dead ends: 92 [2018-10-22 16:02:29,813 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:02:29,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:02:29,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:02:29,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 55. [2018-10-22 16:02:29,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:02:29,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-10-22 16:02:29,823 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2018-10-22 16:02:29,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:29,823 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-10-22 16:02:29,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:02:29,824 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-10-22 16:02:29,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-22 16:02:29,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:29,825 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:29,825 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:29,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:29,825 INFO L82 PathProgramCache]: Analyzing trace with hash -311520398, now seen corresponding path program 7 times [2018-10-22 16:02:29,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:29,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:29,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:29,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:29,827 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:29,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:30,024 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:30,025 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:30,025 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:30,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:30,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:30,025 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 16:02:30,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:30,045 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:30,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:30,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:30,115 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:30,275 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:30,296 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 16:02:30,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:30,312 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:30,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:30,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:30,408 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:30,462 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:30,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 21 [2018-10-22 16:02:30,465 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:30,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:02:30,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:02:30,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:02:30,467 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 12 states. [2018-10-22 16:02:30,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:30,677 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2018-10-22 16:02:30,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:02:30,678 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2018-10-22 16:02:30,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:30,679 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:02:30,679 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:02:30,680 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:02:30,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:02:30,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-10-22 16:02:30,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-22 16:02:30,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-22 16:02:30,689 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2018-10-22 16:02:30,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:30,689 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-22 16:02:30,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:02:30,689 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-22 16:02:30,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-22 16:02:30,690 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:30,690 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:30,691 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:30,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:30,691 INFO L82 PathProgramCache]: Analyzing trace with hash -604143561, now seen corresponding path program 8 times [2018-10-22 16:02:30,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:30,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:30,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:30,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:30,692 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:30,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:30,815 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:30,816 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:30,816 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:30,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:30,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:30,816 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 16:02:30,824 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:30,824 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:30,869 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:30,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:30,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:30,896 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:30,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:31,054 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:31,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,075 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 16:02:31,091 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:31,091 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:31,188 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:31,188 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:31,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:31,200 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:31,200 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:31,263 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:31,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:31,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 23 [2018-10-22 16:02:31,265 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:31,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:02:31,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:02:31,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:02:31,266 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 13 states. [2018-10-22 16:02:31,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:31,376 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2018-10-22 16:02:31,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:02:31,377 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 57 [2018-10-22 16:02:31,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:31,378 INFO L225 Difference]: With dead ends: 106 [2018-10-22 16:02:31,378 INFO L226 Difference]: Without dead ends: 83 [2018-10-22 16:02:31,380 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:02:31,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-10-22 16:02:31,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 61. [2018-10-22 16:02:31,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-22 16:02:31,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-22 16:02:31,389 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-22 16:02:31,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:31,390 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-22 16:02:31,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:02:31,390 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-22 16:02:31,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-22 16:02:31,391 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:31,391 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:31,391 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:31,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:31,392 INFO L82 PathProgramCache]: Analyzing trace with hash 642818386, now seen corresponding path program 9 times [2018-10-22 16:02:31,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:31,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:31,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:31,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:31,393 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:31,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:31,670 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:02:31,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,671 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:31,671 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:31,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:31,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,671 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 16:02:31,679 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:31,679 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:31,725 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:02:31,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:31,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:31,767 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:02:31,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:31,929 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:02:31,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,951 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 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 16:02:31,965 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:31,966 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:32,162 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:02:32,162 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:32,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:32,173 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:02:32,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:32,184 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:02:32,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:32,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10, 10, 10] total 24 [2018-10-22 16:02:32,186 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:32,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:02:32,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:02:32,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:02:32,187 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 16 states. [2018-10-22 16:02:32,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:32,501 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2018-10-22 16:02:32,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:02:32,503 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 60 [2018-10-22 16:02:32,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:32,504 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:02:32,504 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 16:02:32,505 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:02:32,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 16:02:32,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2018-10-22 16:02:32,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-22 16:02:32,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-22 16:02:32,527 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 60 [2018-10-22 16:02:32,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:32,532 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-22 16:02:32,532 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:02:32,532 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-22 16:02:32,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-22 16:02:32,537 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:32,537 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:32,537 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:32,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:32,538 INFO L82 PathProgramCache]: Analyzing trace with hash 586766679, now seen corresponding path program 10 times [2018-10-22 16:02:32,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:32,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:32,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:32,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:32,541 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:32,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:32,783 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:32,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:32,783 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:32,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:32,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:32,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:32,783 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 16:02:32,791 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:32,791 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:32,860 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:32,860 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:32,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:32,882 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:32,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:33,103 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:33,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:33,123 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 16:02:33,141 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:33,141 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:33,281 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:33,281 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:33,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:33,297 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:33,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:33,309 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:33,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:33,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 27 [2018-10-22 16:02:33,311 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:33,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:02:33,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:02:33,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:02:33,312 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 15 states. [2018-10-22 16:02:33,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:33,457 INFO L93 Difference]: Finished difference Result 132 states and 135 transitions. [2018-10-22 16:02:33,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:02:33,459 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-10-22 16:02:33,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:33,460 INFO L225 Difference]: With dead ends: 132 [2018-10-22 16:02:33,460 INFO L226 Difference]: Without dead ends: 91 [2018-10-22 16:02:33,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:02:33,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-22 16:02:33,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2018-10-22 16:02:33,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-10-22 16:02:33,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-10-22 16:02:33,472 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 81 [2018-10-22 16:02:33,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:33,472 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-10-22 16:02:33,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:02:33,472 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-10-22 16:02:33,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-22 16:02:33,474 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:33,474 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:33,474 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:33,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:33,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1890477710, now seen corresponding path program 11 times [2018-10-22 16:02:33,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:33,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:33,475 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:33,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:33,476 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:33,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:34,203 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:34,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:34,204 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:34,204 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:34,204 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:34,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:34,204 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 16:02:34,217 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:34,217 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:34,334 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:02:34,334 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:34,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:34,424 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:34,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:34,707 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:34,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:34,727 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 16:02:34,742 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:34,742 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:35,265 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:02:35,265 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:35,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:35,281 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:35,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:35,334 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:35,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:35,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 29 [2018-10-22 16:02:35,336 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:35,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:02:35,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:02:35,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:02:35,337 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 16 states. [2018-10-22 16:02:35,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:35,647 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2018-10-22 16:02:35,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:02:35,650 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 84 [2018-10-22 16:02:35,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:35,651 INFO L225 Difference]: With dead ends: 139 [2018-10-22 16:02:35,652 INFO L226 Difference]: Without dead ends: 98 [2018-10-22 16:02:35,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:02:35,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-10-22 16:02:35,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 88. [2018-10-22 16:02:35,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-22 16:02:35,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-10-22 16:02:35,664 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2018-10-22 16:02:35,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:35,664 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-10-22 16:02:35,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:02:35,664 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-10-22 16:02:35,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-22 16:02:35,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:35,665 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:35,666 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:35,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:35,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1055023241, now seen corresponding path program 12 times [2018-10-22 16:02:35,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:35,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:35,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:35,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:35,667 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:35,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:35,895 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:35,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:35,896 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:35,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:35,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:35,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:35,896 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 16:02:35,905 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:35,905 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:36,326 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:02:36,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:36,330 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:36,352 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:36,604 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:36,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:36,626 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 16:02:36,641 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:36,641 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:38,280 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:02:38,280 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:38,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:38,298 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:38,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:38,329 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:38,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:38,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 31 [2018-10-22 16:02:38,334 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:38,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:02:38,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:02:38,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:02:38,335 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 17 states. [2018-10-22 16:02:38,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:38,491 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2018-10-22 16:02:38,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:02:38,492 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 87 [2018-10-22 16:02:38,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:38,493 INFO L225 Difference]: With dead ends: 146 [2018-10-22 16:02:38,494 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:02:38,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:02:38,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:02:38,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 91. [2018-10-22 16:02:38,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-10-22 16:02:38,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-10-22 16:02:38,506 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2018-10-22 16:02:38,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:38,506 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-10-22 16:02:38,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:02:38,507 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-10-22 16:02:38,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-10-22 16:02:38,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:38,508 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:38,508 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:38,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:38,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1366417582, now seen corresponding path program 13 times [2018-10-22 16:02:38,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:38,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:38,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:38,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:38,509 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:38,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:38,800 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:38,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:38,801 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:38,801 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:38,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:38,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:38,801 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 16:02:38,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:38,811 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:38,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:38,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:38,928 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:38,928 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:39,455 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:39,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:39,476 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 16:02:39,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:39,509 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:39,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:39,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:39,659 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:39,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:39,710 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:39,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:39,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 33 [2018-10-22 16:02:39,711 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:39,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:02:39,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:02:39,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:02:39,712 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 18 states. [2018-10-22 16:02:39,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:39,887 INFO L93 Difference]: Finished difference Result 153 states and 159 transitions. [2018-10-22 16:02:39,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:02:39,887 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 90 [2018-10-22 16:02:39,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:39,888 INFO L225 Difference]: With dead ends: 153 [2018-10-22 16:02:39,889 INFO L226 Difference]: Without dead ends: 112 [2018-10-22 16:02:39,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:02:39,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-22 16:02:39,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 94. [2018-10-22 16:02:39,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-22 16:02:39,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-22 16:02:39,901 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2018-10-22 16:02:39,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:39,902 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-22 16:02:39,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:02:39,902 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-22 16:02:39,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-22 16:02:39,903 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:39,903 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:39,903 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:39,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:39,904 INFO L82 PathProgramCache]: Analyzing trace with hash -985870953, now seen corresponding path program 14 times [2018-10-22 16:02:39,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:39,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:39,904 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:39,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:39,905 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:39,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:40,950 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:40,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:40,951 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:40,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:40,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:40,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:40,951 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 16:02:40,959 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:40,959 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:41,026 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:41,026 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:41,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:41,054 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:41,054 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:41,580 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:41,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:41,600 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 16:02:41,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:41,615 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:41,771 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:41,771 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:41,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:41,790 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:41,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:41,822 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:41,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:41,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 35 [2018-10-22 16:02:41,824 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:41,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:02:41,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:02:41,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:02:41,825 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 19 states. [2018-10-22 16:02:41,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:41,984 INFO L93 Difference]: Finished difference Result 160 states and 167 transitions. [2018-10-22 16:02:41,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:02:41,985 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 93 [2018-10-22 16:02:41,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:41,986 INFO L225 Difference]: With dead ends: 160 [2018-10-22 16:02:41,986 INFO L226 Difference]: Without dead ends: 119 [2018-10-22 16:02:41,988 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:02:41,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-22 16:02:41,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 97. [2018-10-22 16:02:41,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-22 16:02:41,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-22 16:02:41,997 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-22 16:02:41,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:41,997 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-22 16:02:41,998 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:02:41,998 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-22 16:02:41,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-22 16:02:41,998 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:41,998 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:41,999 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:41,999 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:41,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1460059442, now seen corresponding path program 15 times [2018-10-22 16:02:41,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:41,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:42,000 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:42,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:42,000 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:42,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:42,260 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:02:42,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:42,260 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:42,261 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:42,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:42,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:42,261 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 16:02:42,268 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:42,269 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:42,430 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:02:42,431 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:42,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:42,534 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:02:42,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:42,972 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:02:42,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:42,993 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 16:02:43,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:43,008 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:43,936 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:02:43,936 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:43,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:43,955 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:02:43,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:43,970 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:02:43,972 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:43,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 16, 16, 16] total 36 [2018-10-22 16:02:43,972 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:43,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:02:43,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:02:43,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:02:43,973 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 22 states. [2018-10-22 16:02:44,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:44,290 INFO L93 Difference]: Finished difference Result 169 states and 177 transitions. [2018-10-22 16:02:44,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:02:44,290 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 96 [2018-10-22 16:02:44,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:44,291 INFO L225 Difference]: With dead ends: 169 [2018-10-22 16:02:44,291 INFO L226 Difference]: Without dead ends: 120 [2018-10-22 16:02:44,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:02:44,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-22 16:02:44,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2018-10-22 16:02:44,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-22 16:02:44,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-22 16:02:44,305 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 96 [2018-10-22 16:02:44,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:44,305 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-22 16:02:44,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:02:44,305 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-22 16:02:44,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-22 16:02:44,306 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:44,306 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:44,307 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:44,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:44,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1125679433, now seen corresponding path program 16 times [2018-10-22 16:02:44,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:44,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:44,308 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:44,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:44,308 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:44,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:44,595 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:44,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:44,596 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:44,596 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:44,596 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:44,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:44,596 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 16:02:44,604 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:44,604 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:44,688 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:44,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:44,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:44,711 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:44,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:45,477 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:45,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:45,498 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 16:02:45,514 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:45,515 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:45,719 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:45,719 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:45,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:45,744 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:45,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:45,808 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:45,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:45,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 39 [2018-10-22 16:02:45,811 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:45,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:02:45,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:02:45,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:02:45,813 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 21 states. [2018-10-22 16:02:46,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:46,815 INFO L93 Difference]: Finished difference Result 186 states and 189 transitions. [2018-10-22 16:02:46,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:02:46,815 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 117 [2018-10-22 16:02:46,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:46,816 INFO L225 Difference]: With dead ends: 186 [2018-10-22 16:02:46,817 INFO L226 Difference]: Without dead ends: 127 [2018-10-22 16:02:46,818 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:02:46,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-22 16:02:46,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 121. [2018-10-22 16:02:46,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-10-22 16:02:46,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-10-22 16:02:46,832 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 117 [2018-10-22 16:02:46,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:46,833 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-10-22 16:02:46,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:02:46,833 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-10-22 16:02:46,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-10-22 16:02:46,834 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:46,834 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:46,834 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:46,834 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:46,834 INFO L82 PathProgramCache]: Analyzing trace with hash -455930542, now seen corresponding path program 17 times [2018-10-22 16:02:46,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:46,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:46,835 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:46,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:46,835 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:46,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:47,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:47,521 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:47,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:47,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:47,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:47,521 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 16:02:47,529 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:47,529 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:47,755 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:02:47,755 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:47,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:47,783 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:47,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:49,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:49,669 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 16:02:49,701 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:49,701 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:51,129 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:02:51,130 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:51,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:51,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:51,204 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:51,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:51,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 41 [2018-10-22 16:02:51,206 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:51,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:02:51,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:02:51,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:02:51,208 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 22 states. [2018-10-22 16:02:51,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:51,386 INFO L93 Difference]: Finished difference Result 193 states and 197 transitions. [2018-10-22 16:02:51,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:02:51,387 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 120 [2018-10-22 16:02:51,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:51,388 INFO L225 Difference]: With dead ends: 193 [2018-10-22 16:02:51,388 INFO L226 Difference]: Without dead ends: 134 [2018-10-22 16:02:51,389 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:02:51,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-10-22 16:02:51,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 124. [2018-10-22 16:02:51,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-22 16:02:51,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-10-22 16:02:51,405 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 120 [2018-10-22 16:02:51,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:51,406 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-10-22 16:02:51,406 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:02:51,406 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-10-22 16:02:51,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-22 16:02:51,406 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:51,407 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:51,407 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:51,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:51,407 INFO L82 PathProgramCache]: Analyzing trace with hash 1910191319, now seen corresponding path program 18 times [2018-10-22 16:02:51,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:51,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:51,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:51,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:51,408 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:51,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:51,830 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:51,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:51,831 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:51,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:51,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:51,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:51,831 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 16:02:51,838 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:51,838 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:53,947 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:02:53,947 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:53,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:54,032 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:54,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:02:54,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:54,747 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 16:02:54,763 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:54,763 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:05,869 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:03:05,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:05,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:05,897 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:05,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:05,928 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:05,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:05,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 43 [2018-10-22 16:03:05,930 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:05,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:03:05,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:03:05,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:03:05,932 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 23 states. [2018-10-22 16:03:06,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:06,112 INFO L93 Difference]: Finished difference Result 200 states and 205 transitions. [2018-10-22 16:03:06,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:03:06,113 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 123 [2018-10-22 16:03:06,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:06,114 INFO L225 Difference]: With dead ends: 200 [2018-10-22 16:03:06,114 INFO L226 Difference]: Without dead ends: 141 [2018-10-22 16:03:06,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:03:06,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-22 16:03:06,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 127. [2018-10-22 16:03:06,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-22 16:03:06,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-22 16:03:06,126 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 123 [2018-10-22 16:03:06,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:06,126 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-22 16:03:06,126 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:03:06,126 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-22 16:03:06,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-22 16:03:06,127 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:06,127 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:06,127 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:06,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:06,128 INFO L82 PathProgramCache]: Analyzing trace with hash 2043290418, now seen corresponding path program 19 times [2018-10-22 16:03:06,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:06,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:06,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:06,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:06,129 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:06,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:06,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:06,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:06,727 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:06,727 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:06,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:06,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:06,728 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 16:03:06,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:06,735 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:06,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:06,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:06,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:06,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:07,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:07,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:07,540 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 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 16:03:07,556 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:07,556 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:07,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:07,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:07,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:07,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:07,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:07,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:07,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 45 [2018-10-22 16:03:07,846 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:07,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:03:07,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:03:07,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:03:07,848 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 24 states. [2018-10-22 16:03:08,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:08,078 INFO L93 Difference]: Finished difference Result 207 states and 213 transitions. [2018-10-22 16:03:08,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:03:08,081 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 126 [2018-10-22 16:03:08,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:08,082 INFO L225 Difference]: With dead ends: 207 [2018-10-22 16:03:08,082 INFO L226 Difference]: Without dead ends: 148 [2018-10-22 16:03:08,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:03:08,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-22 16:03:08,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 130. [2018-10-22 16:03:08,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-22 16:03:08,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-22 16:03:08,097 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 126 [2018-10-22 16:03:08,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:08,097 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-22 16:03:08,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:03:08,097 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-22 16:03:08,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-22 16:03:08,098 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:08,098 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:08,098 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:08,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:08,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1351232777, now seen corresponding path program 20 times [2018-10-22 16:03:08,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:08,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:08,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:08,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:08,100 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:08,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:08,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:08,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:08,808 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:08,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:08,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:08,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:08,809 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 16:03:08,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:08,816 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:08,907 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:08,907 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:08,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:08,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:08,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:09,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:09,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:09,589 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 16:03:09,603 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:09,604 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:09,864 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:09,864 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:09,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:09,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:09,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:09,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:09,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:09,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 47 [2018-10-22 16:03:09,989 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:09,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:03:09,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:03:09,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:03:09,991 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 25 states. [2018-10-22 16:03:10,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:10,300 INFO L93 Difference]: Finished difference Result 214 states and 221 transitions. [2018-10-22 16:03:10,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:03:10,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 129 [2018-10-22 16:03:10,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:10,302 INFO L225 Difference]: With dead ends: 214 [2018-10-22 16:03:10,302 INFO L226 Difference]: Without dead ends: 155 [2018-10-22 16:03:10,304 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:03:10,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-10-22 16:03:10,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 133. [2018-10-22 16:03:10,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-22 16:03:10,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-22 16:03:10,325 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-22 16:03:10,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:10,325 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-22 16:03:10,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:03:10,325 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-22 16:03:10,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-22 16:03:10,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:10,326 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:10,327 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:10,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:10,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1708216594, now seen corresponding path program 21 times [2018-10-22 16:03:10,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:10,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:10,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:10,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:10,328 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:10,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:10,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:03:10,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,854 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:10,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:10,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:10,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,854 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 16:03:10,882 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:10,882 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:11,952 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:03:11,952 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:11,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:12,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:03:12,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:12,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:03:12,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:12,605 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 16:03:12,620 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:12,620 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:16,467 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:03:16,468 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:16,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:16,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:03:16,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:16,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:03:16,518 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:16,518 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 22, 22, 22] total 48 [2018-10-22 16:03:16,518 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:16,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:03:16,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:03:16,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:03:16,519 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 28 states. [2018-10-22 16:03:16,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:16,818 INFO L93 Difference]: Finished difference Result 223 states and 231 transitions. [2018-10-22 16:03:16,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:03:16,818 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 132 [2018-10-22 16:03:16,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:16,819 INFO L225 Difference]: With dead ends: 223 [2018-10-22 16:03:16,819 INFO L226 Difference]: Without dead ends: 156 [2018-10-22 16:03:16,821 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 16:03:16,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-10-22 16:03:16,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2018-10-22 16:03:16,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-22 16:03:16,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-22 16:03:16,844 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 132 [2018-10-22 16:03:16,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:16,844 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-22 16:03:16,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:03:16,845 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-22 16:03:16,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-22 16:03:16,845 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:16,845 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:16,846 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:16,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:16,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1193714665, now seen corresponding path program 22 times [2018-10-22 16:03:16,846 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:16,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:16,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:16,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:16,847 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:16,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:17,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:17,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:17,606 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:17,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:17,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:17,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:17,606 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 16:03:17,613 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:17,613 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:17,720 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:17,721 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:17,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:17,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:17,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:18,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:18,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:18,431 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 16:03:18,445 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:18,445 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:18,699 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:18,699 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:18,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:18,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:18,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:18,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:18,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 51 [2018-10-22 16:03:18,810 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:18,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:03:18,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:03:18,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:03:18,812 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 27 states. [2018-10-22 16:03:19,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:19,126 INFO L93 Difference]: Finished difference Result 240 states and 243 transitions. [2018-10-22 16:03:19,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:03:19,126 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2018-10-22 16:03:19,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:19,127 INFO L225 Difference]: With dead ends: 240 [2018-10-22 16:03:19,127 INFO L226 Difference]: Without dead ends: 163 [2018-10-22 16:03:19,129 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 587 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:03:19,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-22 16:03:19,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2018-10-22 16:03:19,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-22 16:03:19,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-22 16:03:19,150 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 153 [2018-10-22 16:03:19,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:19,150 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-22 16:03:19,150 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:03:19,150 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-22 16:03:19,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-22 16:03:19,151 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:19,151 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:19,151 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:19,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:19,152 INFO L82 PathProgramCache]: Analyzing trace with hash -2060256974, now seen corresponding path program 23 times [2018-10-22 16:03:19,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:19,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:19,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:19,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:19,153 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:19,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:20,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:20,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:20,180 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:20,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:20,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:20,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:20,180 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 16:03:20,187 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:20,187 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:20,641 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:03:20,641 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:20,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:20,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:20,673 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:21,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:21,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:21,403 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 16:03:21,418 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:21,418 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:24,986 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:03:24,986 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:24,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:25,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:25,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:25,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:25,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:25,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 53 [2018-10-22 16:03:25,070 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:25,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:03:25,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:03:25,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:03:25,072 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 28 states. [2018-10-22 16:03:25,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:25,666 INFO L93 Difference]: Finished difference Result 247 states and 251 transitions. [2018-10-22 16:03:25,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:03:25,667 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 156 [2018-10-22 16:03:25,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:25,668 INFO L225 Difference]: With dead ends: 247 [2018-10-22 16:03:25,668 INFO L226 Difference]: Without dead ends: 170 [2018-10-22 16:03:25,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 598 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:03:25,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-10-22 16:03:25,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 160. [2018-10-22 16:03:25,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-22 16:03:25,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-10-22 16:03:25,699 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 156 [2018-10-22 16:03:25,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:25,700 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-10-22 16:03:25,700 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:03:25,700 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-10-22 16:03:25,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-22 16:03:25,702 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:25,702 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:25,702 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:25,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:25,702 INFO L82 PathProgramCache]: Analyzing trace with hash -173768137, now seen corresponding path program 24 times [2018-10-22 16:03:25,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:25,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:25,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:25,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:25,703 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:25,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:29,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:29,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:29,057 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:29,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:29,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:29,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:29,057 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 16:03:29,066 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:29,066 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:45,855 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:03:45,855 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:45,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:45,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:03:45,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:46,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-22 16:03:46,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:46,859 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 16:03:46,875 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:46,875 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:05:02,529 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:05:02,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:02,556 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:02,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:05:02,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:02,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:05:02,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:02,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 61 [2018-10-22 16:05:02,770 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:02,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:05:02,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:05:02,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 16:05:02,773 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 31 states. [2018-10-22 16:05:03,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:03,053 INFO L93 Difference]: Finished difference Result 256 states and 261 transitions. [2018-10-22 16:05:03,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:05:03,054 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 159 [2018-10-22 16:05:03,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:03,054 INFO L225 Difference]: With dead ends: 256 [2018-10-22 16:05:03,055 INFO L226 Difference]: Without dead ends: 174 [2018-10-22 16:05:03,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 603 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:05:03,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-22 16:05:03,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2018-10-22 16:05:03,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-22 16:05:03,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-22 16:05:03,088 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 159 [2018-10-22 16:05:03,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:03,088 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-22 16:05:03,088 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:05:03,088 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-22 16:05:03,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-22 16:05:03,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:03,089 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:03,089 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:03,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:03,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1476419884, now seen corresponding path program 25 times [2018-10-22 16:05:03,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:03,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:03,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:03,090 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:03,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:03,674 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:03,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,675 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:03,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:03,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:03,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:03,675 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 16:05:03,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:03,691 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:03,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:03,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:03,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:03,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:04,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:04,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:04,702 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 16:05:04,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:04,717 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:05:04,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:04,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:05,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:05,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:05,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:05,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:05,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 57 [2018-10-22 16:05:05,105 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:05,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:05:05,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:05:05,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:05:05,107 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 30 states. [2018-10-22 16:05:05,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:05,506 INFO L93 Difference]: Finished difference Result 267 states and 270 transitions. [2018-10-22 16:05:05,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:05:05,514 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 171 [2018-10-22 16:05:05,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:05,515 INFO L225 Difference]: With dead ends: 267 [2018-10-22 16:05:05,515 INFO L226 Difference]: Without dead ends: 181 [2018-10-22 16:05:05,516 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 656 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:05:05,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-22 16:05:05,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 175. [2018-10-22 16:05:05,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-10-22 16:05:05,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-10-22 16:05:05,541 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 171 [2018-10-22 16:05:05,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:05,541 INFO L481 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-10-22 16:05:05,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:05:05,541 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-10-22 16:05:05,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-22 16:05:05,542 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:05,543 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:05,543 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:05,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:05,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1627108561, now seen corresponding path program 26 times [2018-10-22 16:05:05,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:05,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:05,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:05:05,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:05,544 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:05,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:06,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2134 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:06,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:06,129 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:06,129 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:06,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:06,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:06,130 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 16:05:06,144 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:06,144 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:06,256 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:06,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:06,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:06,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2134 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:06,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:07,778 INFO L134 CoverageAnalysis]: Checked inductivity of 2134 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:07,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:07,810 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 16:05:07,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:05:07,834 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:08,106 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:05:08,107 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:08,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:08,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2134 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:08,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:08,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2134 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:08,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:08,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 59 [2018-10-22 16:05:08,222 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:08,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:05:08,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:05:08,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:05:08,223 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 31 states. [2018-10-22 16:05:08,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:08,547 INFO L93 Difference]: Finished difference Result 274 states and 278 transitions. [2018-10-22 16:05:08,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:05:08,547 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 174 [2018-10-22 16:05:08,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:08,548 INFO L225 Difference]: With dead ends: 274 [2018-10-22 16:05:08,548 INFO L226 Difference]: Without dead ends: 188 [2018-10-22 16:05:08,549 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 667 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:05:08,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-10-22 16:05:08,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 178. [2018-10-22 16:05:08,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-22 16:05:08,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-10-22 16:05:08,581 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 174 [2018-10-22 16:05:08,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:08,582 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-10-22 16:05:08,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:05:08,582 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-10-22 16:05:08,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-22 16:05:08,583 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:08,583 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:08,583 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:08,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:08,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1742306548, now seen corresponding path program 27 times [2018-10-22 16:05:08,584 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:08,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:08,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:08,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:08,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:08,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:09,298 INFO L134 CoverageAnalysis]: Checked inductivity of 2217 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-10-22 16:05:09,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:09,299 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:09,299 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:09,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:09,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:09,299 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 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 16:05:09,307 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:09,307 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:16,005 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-22 16:05:16,005 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:16,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:16,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2217 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:05:16,090 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:17,021 INFO L134 CoverageAnalysis]: Checked inductivity of 2217 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:05:17,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:17,044 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 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 16:05:17,060 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:05:17,060 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:05:40,047 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-22 16:05:40,048 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:40,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:40,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2217 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:05:40,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:40,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2217 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:05:40,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:40,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 63 [2018-10-22 16:05:40,159 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:40,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:05:40,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:05:40,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1721, Invalid=2185, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:05:40,160 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 34 states. [2018-10-22 16:05:40,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:40,497 INFO L93 Difference]: Finished difference Result 283 states and 288 transitions. [2018-10-22 16:05:40,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:05:40,497 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 177 [2018-10-22 16:05:40,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:40,498 INFO L225 Difference]: With dead ends: 283 [2018-10-22 16:05:40,498 INFO L226 Difference]: Without dead ends: 192 [2018-10-22 16:05:40,500 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 676 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1727, Invalid=2305, Unknown=0, NotChecked=0, Total=4032 [2018-10-22 16:05:40,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-22 16:05:40,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2018-10-22 16:05:40,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-22 16:05:40,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-22 16:05:40,530 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 177 [2018-10-22 16:05:40,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:40,531 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-22 16:05:40,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:05:40,531 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-22 16:05:40,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-22 16:05:40,531 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:40,532 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:40,532 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:40,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:40,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1030287735, now seen corresponding path program 28 times [2018-10-22 16:05:40,532 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:40,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:40,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:40,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:40,533 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:40,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:41,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:41,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:41,605 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:41,605 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:41,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:41,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:41,605 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 16:05:41,612 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:41,613 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:41,748 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:41,748 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:41,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:41,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:41,884 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:43,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:43,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:43,273 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:05:43,289 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:05:43,289 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:05:43,637 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:05:43,638 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:43,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:43,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:43,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:43,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:43,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:43,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 63 [2018-10-22 16:05:43,767 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:43,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:05:43,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:05:43,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:05:43,769 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 33 states. [2018-10-22 16:05:44,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:44,523 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2018-10-22 16:05:44,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:05:44,524 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 189 [2018-10-22 16:05:44,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:44,525 INFO L225 Difference]: With dead ends: 294 [2018-10-22 16:05:44,525 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:05:44,526 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 786 GetRequests, 725 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:05:44,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:05:44,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 193. [2018-10-22 16:05:44,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-10-22 16:05:44,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2018-10-22 16:05:44,556 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 189 [2018-10-22 16:05:44,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:44,556 INFO L481 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2018-10-22 16:05:44,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:05:44,556 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2018-10-22 16:05:44,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-10-22 16:05:44,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:44,557 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:44,557 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:44,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:44,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1867817710, now seen corresponding path program 29 times [2018-10-22 16:05:44,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:44,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:44,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:44,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:44,559 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:44,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:45,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:45,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,165 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:45,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:45,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:45,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:45,166 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 16:05:45,175 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:45,175 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:46,191 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:05:46,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:46,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:46,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:46,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:47,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:47,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:47,324 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:05:47,338 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:47,339 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:55,070 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:05:55,070 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:55,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:55,132 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:55,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:55,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:55,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:55,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 65 [2018-10-22 16:05:55,167 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:55,167 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:05:55,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:05:55,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:05:55,169 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand 34 states. [2018-10-22 16:05:55,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:55,636 INFO L93 Difference]: Finished difference Result 301 states and 305 transitions. [2018-10-22 16:05:55,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:05:55,637 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 192 [2018-10-22 16:05:55,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:55,638 INFO L225 Difference]: With dead ends: 301 [2018-10-22 16:05:55,638 INFO L226 Difference]: Without dead ends: 206 [2018-10-22 16:05:55,639 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 736 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:05:55,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-10-22 16:05:55,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 196. [2018-10-22 16:05:55,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-22 16:05:55,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2018-10-22 16:05:55,676 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 192 [2018-10-22 16:05:55,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:55,677 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2018-10-22 16:05:55,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:05:55,677 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2018-10-22 16:05:55,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-22 16:05:55,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:55,678 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:55,678 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:55,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:55,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1894545513, now seen corresponding path program 30 times [2018-10-22 16:05:55,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:55,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:55,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:55,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:55,679 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:55,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:57,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:05:57,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:57,147 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:57,147 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:57,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:57,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:57,147 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 16:05:57,157 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:57,157 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:06:35,968 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 32 check-sat command(s) [2018-10-22 16:06:35,969 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:35,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:36,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:06:36,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:37,212 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:06:37,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:37,240 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 16:06:37,255 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:06:37,255 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown