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-new/count_by_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:09:38,382 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:09:38,384 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:09:38,400 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:09:38,400 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:09:38,402 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:09:38,403 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:09:38,406 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:09:38,409 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:09:38,410 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:09:38,412 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:09:38,412 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:09:38,414 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:09:38,417 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:09:38,424 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:09:38,425 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:09:38,428 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:09:38,430 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:09:38,431 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:09:38,435 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:09:38,437 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:09:38,438 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:09:38,441 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:09:38,441 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:09:38,441 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:09:38,444 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:09:38,446 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:09:38,447 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:09:38,448 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:09:38,451 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:09:38,451 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:09:38,452 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:09:38,456 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 16:09:38,478 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:09:38,478 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:09:38,479 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:09:38,479 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:09:38,479 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:09:38,480 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:09:38,480 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:09:38,480 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:09:38,480 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:09:38,480 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:09:38,481 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:09:38,481 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:09:38,482 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:09:38,483 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:09:38,483 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:09:38,483 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:09:38,483 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:09:38,484 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:09:38,484 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:09:38,484 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:09:38,484 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:09:38,484 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:09:38,485 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:09:38,486 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:09:38,486 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:09:38,486 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:09:38,487 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:09:38,487 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:09:38,487 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:09:38,487 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:09:38,487 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:09:38,488 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:09:38,488 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:09:38,488 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:09:38,541 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:09:38,554 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:09:38,558 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:09:38,559 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:09:38,560 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:09:38,560 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-22 16:09:38,620 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2d8002262/df108fff00a64ce8940c0fbb7527001a/FLAGfdeabe939 [2018-10-22 16:09:39,064 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:09:39,065 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-22 16:09:39,071 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2d8002262/df108fff00a64ce8940c0fbb7527001a/FLAGfdeabe939 [2018-10-22 16:09:39,088 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2d8002262/df108fff00a64ce8940c0fbb7527001a [2018-10-22 16:09:39,101 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:09:39,103 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:09:39,105 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:39,105 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:09:39,111 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:09:39,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,115 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19780353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,115 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,126 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:09:39,149 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:09:39,338 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:39,342 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:09:39,356 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:09:39,370 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:09:39,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39 WrapperNode [2018-10-22 16:09:39,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:09:39,371 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:39,371 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:09:39,371 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:09:39,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,395 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:09:39,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:09:39,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:09:39,396 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:09:39,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,406 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,407 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,410 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,416 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (1/1) ... [2018-10-22 16:09:39,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:09:39,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:09:39,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:09:39,418 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:09:39,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (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 16:09:39,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:09:39,482 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:09:39,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:09:39,483 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:09:39,483 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:09:39,483 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:09:39,483 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:09:39,483 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:09:39,708 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:09:39,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:39 BoogieIcfgContainer [2018-10-22 16:09:39,709 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:09:39,710 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:09:39,710 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:09:39,714 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:09:39,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:09:39" (1/3) ... [2018-10-22 16:09:39,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f32d44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:09:39" (2/3) ... [2018-10-22 16:09:39,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57f32d44 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:09:39, skipping insertion in model container [2018-10-22 16:09:39,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:09:39" (3/3) ... [2018-10-22 16:09:39,717 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2_true-unreach-call_true-termination.i [2018-10-22 16:09:39,725 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:09:39,732 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:09:39,746 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:09:39,775 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:09:39,776 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:09:39,776 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:09:39,776 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:09:39,776 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:09:39,777 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:09:39,777 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:09:39,777 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:09:39,777 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:09:39,794 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-22 16:09:39,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:09:39,799 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:39,800 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:39,802 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:39,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:39,809 INFO L82 PathProgramCache]: Analyzing trace with hash 563245249, now seen corresponding path program 1 times [2018-10-22 16:09:39,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:39,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:39,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:39,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:39,858 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:39,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:39,910 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 16:09:39,912 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:39,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:09:39,912 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:39,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:09:39,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:09:39,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:09:39,930 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-22 16:09:39,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:39,951 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-22 16:09:39,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:09:39,952 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:09:39,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:39,962 INFO L225 Difference]: With dead ends: 32 [2018-10-22 16:09:39,962 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:09:39,966 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 16:09:39,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:09:39,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:09:39,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:09:40,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-22 16:09:40,001 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-22 16:09:40,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,002 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-22 16:09:40,002 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:09:40,002 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-22 16:09:40,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:09:40,003 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,003 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,003 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,004 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,004 INFO L82 PathProgramCache]: Analyzing trace with hash -496423, now seen corresponding path program 1 times [2018-10-22 16:09:40,004 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,005 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,006 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,050 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 16:09:40,050 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:09:40,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:09:40,051 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:09:40,052 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:09:40,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:09:40,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:09:40,053 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-22 16:09:40,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:40,136 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 16:09:40,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:09:40,137 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:09:40,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:40,138 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:09:40,138 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:09:40,139 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 16:09:40,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:09:40,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-22 16:09:40,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:09:40,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-22 16:09:40,145 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-22 16:09:40,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,145 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-22 16:09:40,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:09:40,146 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-22 16:09:40,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:09:40,146 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,146 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,147 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1177044387, now seen corresponding path program 1 times [2018-10-22 16:09:40,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,150 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,247 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 16:09:40,247 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,247 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:40,248 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:09:40,251 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [22], [25], [27], [33], [34], [35], [37] [2018-10-22 16:09:40,295 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:09:40,296 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:09:40,472 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:09:40,473 INFO L272 AbstractInterpreter]: Visited 13 different actions 43 times. Merged at 4 different actions 21 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-22 16:09:40,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:09:40,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,487 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 16:09:40,511 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,511 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:40,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:40,570 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 16:09:40,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:40,669 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 16:09:40,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,690 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 16:09:40,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,706 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:40,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:40,724 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 16:09:40,725 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:40,747 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 16:09:40,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:40,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:09:40,749 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:40,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:09:40,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:09:40,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:09:40,750 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-22 16:09:40,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:40,784 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-22 16:09:40,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:09:40,784 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:09:40,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:40,785 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:09:40,786 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:09:40,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:09:40,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:09:40,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-22 16:09:40,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:09:40,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 16:09:40,791 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-22 16:09:40,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:40,791 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 16:09:40,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:09:40,791 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 16:09:40,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:09:40,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:40,792 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:40,792 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:40,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:40,793 INFO L82 PathProgramCache]: Analyzing trace with hash -489337255, now seen corresponding path program 2 times [2018-10-22 16:09:40,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:40,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:40,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:40,795 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:40,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:40,895 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:40,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,896 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:40,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:40,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:40,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,897 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 16:09:40,909 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:40,910 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:40,949 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:40,949 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:40,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:40,957 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:40,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,255 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,287 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 16:09:41,304 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:41,304 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:41,320 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:41,320 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:41,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,336 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,355 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:41,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:09:41,357 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:41,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:09:41,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:09:41,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:09:41,359 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-10-22 16:09:41,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:41,412 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 16:09:41,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:09:41,413 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:09:41,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:41,414 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:09:41,414 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:09:41,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:09:41,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:09:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-22 16:09:41,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:09:41,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-22 16:09:41,420 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-22 16:09:41,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:41,420 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-22 16:09:41,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:09:41,421 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-22 16:09:41,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:09:41,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:41,422 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:41,422 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:41,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:41,422 INFO L82 PathProgramCache]: Analyzing trace with hash -169763, now seen corresponding path program 3 times [2018-10-22 16:09:41,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:41,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:41,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,424 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:41,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:41,503 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,504 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:41,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:41,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:41,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,505 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 16:09:41,516 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:41,517 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:41,533 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:09:41,533 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:41,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,542 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,730 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:41,762 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 16:09:41,779 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:41,779 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:41,800 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:09:41,801 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:41,805 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:41,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,852 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (7)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:41,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:41,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:09:41,856 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:41,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:09:41,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:09:41,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:09:41,858 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-10-22 16:09:41,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:41,898 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 16:09:41,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:09:41,899 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-22 16:09:41,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:41,900 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:09:41,900 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:09:41,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:09:41,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:09:41,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-22 16:09:41,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:09:41,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 16:09:41,906 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-22 16:09:41,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:41,906 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 16:09:41,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:09:41,907 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 16:09:41,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:09:41,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:41,908 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:41,908 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:41,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:41,908 INFO L82 PathProgramCache]: Analyzing trace with hash -35450919, now seen corresponding path program 4 times [2018-10-22 16:09:41,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:41,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:41,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,910 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:41,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:42,012 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,013 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:42,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:42,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:42,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,013 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 16:09:42,021 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:42,022 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:42,031 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:42,032 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,034 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,041 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:42,494 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,527 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 16:09:42,551 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:42,551 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:42,571 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:42,572 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,582 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:42,624 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:42,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:09:42,627 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:42,627 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:09:42,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:09:42,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:09:42,628 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-22 16:09:42,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:42,661 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 16:09:42,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:09:42,663 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:09:42,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:42,664 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:09:42,664 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 16:09:42,665 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:09:42,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 16:09:42,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-22 16:09:42,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:09:42,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-22 16:09:42,669 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-22 16:09:42,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:42,670 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-22 16:09:42,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:09:42,670 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-22 16:09:42,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:09:42,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:42,671 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:42,671 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:42,671 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:42,672 INFO L82 PathProgramCache]: Analyzing trace with hash 1170618205, now seen corresponding path program 5 times [2018-10-22 16:09:42,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:42,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:42,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,673 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:42,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:42,768 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,769 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:42,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:42,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:42,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,769 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 16:09:42,777 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:42,778 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:42,790 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:09:42,790 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,807 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:42,939 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:42,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,961 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 16:09:42,977 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:42,977 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:43,003 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:09:43,004 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:43,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,017 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:43,038 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:43,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:09:43,040 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:43,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:09:43,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:09:43,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:43,048 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-22 16:09:43,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:43,107 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 16:09:43,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:09:43,109 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:09:43,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:43,110 INFO L225 Difference]: With dead ends: 36 [2018-10-22 16:09:43,110 INFO L226 Difference]: Without dead ends: 31 [2018-10-22 16:09:43,111 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:09:43,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-22 16:09:43,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-22 16:09:43,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:09:43,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 16:09:43,115 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-22 16:09:43,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:43,116 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 16:09:43,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:09:43,116 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 16:09:43,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:09:43,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:43,117 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:43,117 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:43,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:43,117 INFO L82 PathProgramCache]: Analyzing trace with hash -520507047, now seen corresponding path program 6 times [2018-10-22 16:09:43,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:43,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:43,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,119 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:43,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,235 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,236 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:43,236 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:43,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:43,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,236 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 16:09:43,245 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:43,246 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:43,259 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:09:43,259 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:43,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,269 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:43,492 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,513 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 16:09:43,529 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:43,529 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:43,563 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:09:43,563 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:43,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,573 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:43,597 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:43,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:09:43,599 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:43,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:09:43,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:09:43,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:09:43,600 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-22 16:09:43,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:43,634 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-22 16:09:43,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:09:43,636 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-22 16:09:43,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:43,638 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:09:43,638 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:09:43,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:09:43,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:09:43,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-22 16:09:43,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-22 16:09:43,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-22 16:09:43,644 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-22 16:09:43,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:43,645 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-22 16:09:43,645 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:09:43,645 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-22 16:09:43,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-22 16:09:43,646 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:43,646 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:43,646 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:43,647 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:43,647 INFO L82 PathProgramCache]: Analyzing trace with hash -866507299, now seen corresponding path program 7 times [2018-10-22 16:09:43,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:43,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:43,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:43,648 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:43,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,840 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,841 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:43,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:43,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:43,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:43,841 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 16:09:43,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:43,850 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:43,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:43,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:43,868 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:43,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,214 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,234 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:09:44,249 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:44,249 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:44,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:44,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,276 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,348 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:44,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:09:44,353 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:44,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:09:44,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:09:44,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:09:44,354 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-22 16:09:44,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:44,457 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 16:09:44,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:09:44,459 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-22 16:09:44,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:44,461 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:09:44,461 INFO L226 Difference]: Without dead ends: 37 [2018-10-22 16:09:44,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:09:44,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-22 16:09:44,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-22 16:09:44,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:09:44,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 16:09:44,465 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-22 16:09:44,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:44,466 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 16:09:44,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:09:44,466 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 16:09:44,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:09:44,467 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:44,467 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:44,468 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:44,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:44,468 INFO L82 PathProgramCache]: Analyzing trace with hash -638504231, now seen corresponding path program 8 times [2018-10-22 16:09:44,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:44,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:44,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,469 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:44,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:44,625 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,626 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:44,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:44,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:44,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,627 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 16:09:44,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:44,637 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:44,646 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:44,646 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,660 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,903 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,923 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 16:09:44,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:44,941 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:44,962 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:44,962 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,977 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:44,977 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,005 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:45,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:09:45,007 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:45,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:09:45,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:09:45,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:09:45,008 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-22 16:09:45,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:45,083 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-22 16:09:45,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:09:45,083 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:09:45,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:45,084 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:09:45,085 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:09:45,085 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:09:45,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:09:45,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-22 16:09:45,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:09:45,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-22 16:09:45,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-22 16:09:45,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:45,091 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-22 16:09:45,091 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:09:45,091 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-22 16:09:45,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:09:45,092 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,092 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,092 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1457599581, now seen corresponding path program 9 times [2018-10-22 16:09:45,093 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,094 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:45,094 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,094 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,282 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,283 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:45,283 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:45,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:45,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,283 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 16:09:45,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:45,298 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:45,311 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:09:45,311 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:45,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,321 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,322 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,607 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,628 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 16:09:45,643 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:45,644 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:45,689 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:09:45,689 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:45,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,701 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:45,773 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:45,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:45,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-10-22 16:09:45,776 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:45,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:09:45,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:09:45,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:09:45,778 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-22 16:09:45,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:45,912 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 16:09:45,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:09:45,913 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:09:45,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:45,914 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:09:45,914 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:09:45,915 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:09:45,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:09:45,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-22 16:09:45,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:09:45,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 16:09:45,920 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-22 16:09:45,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:45,921 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 16:09:45,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:09:45,921 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 16:09:45,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:09:45,922 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:45,922 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:45,922 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:45,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:45,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1956746329, now seen corresponding path program 10 times [2018-10-22 16:09:45,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:45,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:45,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:45,924 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:45,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:46,100 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:46,100 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:46,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:46,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,101 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) [2018-10-22 16:09:46,116 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:46,117 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:46,143 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:46,143 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:46,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,153 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,715 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,737 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 16:09:46,755 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:46,755 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:46,778 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:46,778 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:46,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,789 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,814 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:46,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:46,816 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:09:46,816 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:46,816 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:09:46,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:09:46,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:09:46,817 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-22 16:09:46,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:46,874 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-22 16:09:46,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:09:46,875 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-22 16:09:46,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:46,876 INFO L225 Difference]: With dead ends: 51 [2018-10-22 16:09:46,876 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 16:09:46,877 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:09:46,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 16:09:46,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-22 16:09:46,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-22 16:09:46,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-22 16:09:46,882 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-22 16:09:46,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:46,882 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-22 16:09:46,882 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:09:46,882 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-22 16:09:46,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-22 16:09:46,883 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:46,884 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:46,884 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:46,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:46,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1434230051, now seen corresponding path program 11 times [2018-10-22 16:09:46,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:46,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,885 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:46,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:46,885 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:46,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:47,279 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,280 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:47,280 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:47,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:47,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,281 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 16:09:47,289 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,289 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,327 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:09:47,327 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,337 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,629 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:47,649 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 16:09:47,668 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:47,668 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,716 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:09:47,717 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,728 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,729 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,744 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:47,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:47,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:09:47,745 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:47,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:09:47,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:09:47,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:47,746 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-22 16:09:47,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:47,853 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-22 16:09:47,853 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:09:47,854 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-22 16:09:47,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:47,855 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:09:47,855 INFO L226 Difference]: Without dead ends: 49 [2018-10-22 16:09:47,856 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:47,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-22 16:09:47,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-22 16:09:47,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:09:47,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-22 16:09:47,861 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-22 16:09:47,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:47,861 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-22 16:09:47,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:09:47,862 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-22 16:09:47,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:09:47,863 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:47,863 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:47,863 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:47,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:47,863 INFO L82 PathProgramCache]: Analyzing trace with hash -85797415, now seen corresponding path program 12 times [2018-10-22 16:09:47,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:47,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:47,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,865 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:47,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:48,016 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,016 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:48,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:48,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:48,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,017 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 16:09:48,024 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:48,024 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:48,040 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:09:48,040 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,049 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,318 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,338 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 16:09:48,353 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:48,353 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:48,415 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:09:48,415 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,428 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:48,463 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:48,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:09:48,465 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:48,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:09:48,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:09:48,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:48,466 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-22 16:09:48,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:48,515 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-22 16:09:48,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:09:48,515 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:09:48,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:48,516 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:09:48,516 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:09:48,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:48,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:09:48,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-22 16:09:48,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:09:48,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-22 16:09:48,524 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-22 16:09:48,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:48,524 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-22 16:09:48,524 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:09:48,524 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-22 16:09:48,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:09:48,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:48,525 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:48,525 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:48,526 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:48,526 INFO L82 PathProgramCache]: Analyzing trace with hash 241742173, now seen corresponding path program 13 times [2018-10-22 16:09:48,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:48,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:48,527 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:48,527 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:48,527 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:48,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:48,701 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,701 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:48,701 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:48,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:48,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,702 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 16:09:48,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:48,711 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:48,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:48,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,746 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:48,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,393 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,417 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 16:09:49,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:49,432 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:49,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:49,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:49,463 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,526 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:49,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:09:49,529 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:49,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:09:49,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:09:49,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:49,531 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-22 16:09:49,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:49,684 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-22 16:09:49,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:09:49,684 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:09:49,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:49,685 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:09:49,686 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:09:49,687 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:49,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:09:49,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-22 16:09:49,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 16:09:49,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-22 16:09:49,692 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-22 16:09:49,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:49,692 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-22 16:09:49,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:09:49,693 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-22 16:09:49,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:09:49,693 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:49,694 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:49,694 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:49,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:49,694 INFO L82 PathProgramCache]: Analyzing trace with hash -192088231, now seen corresponding path program 14 times [2018-10-22 16:09:49,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:49,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:49,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,696 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:49,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:49,856 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,857 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:49,857 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:49,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:49,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,857 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 16:09:49,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:49,866 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:49,893 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:49,893 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:49,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:49,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,296 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,317 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:09:50,332 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:50,332 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:50,356 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:50,357 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,365 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,383 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:50,383 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:09:50,383 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:50,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:09:50,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:09:50,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:50,385 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-22 16:09:50,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:50,487 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-22 16:09:50,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:09:50,487 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-22 16:09:50,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:50,488 INFO L225 Difference]: With dead ends: 63 [2018-10-22 16:09:50,488 INFO L226 Difference]: Without dead ends: 58 [2018-10-22 16:09:50,490 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:50,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-22 16:09:50,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-22 16:09:50,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-22 16:09:50,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-22 16:09:50,497 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-22 16:09:50,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:50,504 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-22 16:09:50,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:09:50,504 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-22 16:09:50,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-22 16:09:50,505 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:50,505 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:50,506 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:50,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:50,506 INFO L82 PathProgramCache]: Analyzing trace with hash -877060131, now seen corresponding path program 15 times [2018-10-22 16:09:50,506 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:50,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,507 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:50,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,507 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:50,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:50,747 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,747 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:50,747 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:50,747 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:50,747 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:50,747 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 16:09:50,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:50,755 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:50,770 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:09:50,770 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,772 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,781 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:50,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,199 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,223 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 16:09:51,238 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:51,239 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:51,319 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:09:51,320 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:51,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:51,334 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:51,345 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,346 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:51,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:09:51,347 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:51,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:09:51,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:09:51,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:51,348 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-22 16:09:51,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:51,421 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-22 16:09:51,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:09:51,422 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-22 16:09:51,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:51,423 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:09:51,423 INFO L226 Difference]: Without dead ends: 61 [2018-10-22 16:09:51,424 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:51,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-22 16:09:51,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-22 16:09:51,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:09:51,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-22 16:09:51,430 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-22 16:09:51,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:51,430 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-22 16:09:51,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:09:51,430 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-22 16:09:51,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:09:51,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:51,432 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:51,432 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:51,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:51,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1485309735, now seen corresponding path program 16 times [2018-10-22 16:09:51,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:51,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:51,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:51,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:51,434 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:51,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,984 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:51,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,985 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:51,985 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:51,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:51,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,985 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 16:09:52,003 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:52,004 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:52,014 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:52,015 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:52,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,028 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:52,610 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:52,630 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 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 16:09:52,644 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:52,645 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:52,670 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:52,670 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:52,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,680 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:52,740 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:52,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:52,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:09:52,741 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:52,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:09:52,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:09:52,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:52,743 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-22 16:09:52,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:52,879 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-22 16:09:52,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:09:52,882 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:09:52,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:52,883 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:09:52,883 INFO L226 Difference]: Without dead ends: 64 [2018-10-22 16:09:52,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:52,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-22 16:09:52,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-22 16:09:52,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:09:52,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-22 16:09:52,888 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-22 16:09:52,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:52,888 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-22 16:09:52,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:09:52,888 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-22 16:09:52,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:09:52,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:52,889 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:52,889 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:52,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:52,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1382240675, now seen corresponding path program 17 times [2018-10-22 16:09:52,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:52,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,890 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:52,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:52,891 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:52,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:53,282 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,282 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:53,282 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:53,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:53,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:53,283 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 16:09:53,289 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:53,290 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:53,307 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:09:53,307 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:53,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:53,319 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:53,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,302 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,322 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 16:09:54,337 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:54,337 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:54,420 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:09:54,420 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:54,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,434 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:54,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:54,493 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (35)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:54,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:54,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:09:54,495 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:54,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:09:54,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:09:54,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:54,498 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-22 16:09:54,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:54,959 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-22 16:09:54,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:09:54,960 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-22 16:09:54,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:54,960 INFO L225 Difference]: With dead ends: 72 [2018-10-22 16:09:54,961 INFO L226 Difference]: Without dead ends: 67 [2018-10-22 16:09:54,961 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:54,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-22 16:09:54,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-22 16:09:54,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:09:54,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-22 16:09:54,965 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-22 16:09:54,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:54,965 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-22 16:09:54,965 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:09:54,965 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-22 16:09:54,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:09:54,966 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:54,966 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:54,966 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:54,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:54,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1753490855, now seen corresponding path program 18 times [2018-10-22 16:09:54,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:54,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:54,967 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:54,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:54,968 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:55,672 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,672 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:55,672 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:55,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:55,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,672 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 16:09:55,679 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:55,680 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:55,703 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:09:55,703 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:55,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:55,716 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:55,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:56,210 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,232 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 16:09:56,248 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:56,248 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:56,347 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:09:56,347 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:56,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,358 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:56,405 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (37)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:09:56,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:56,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-10-22 16:09:56,408 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:56,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:09:56,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:09:56,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:09:56,410 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-22 16:09:56,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:56,501 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-22 16:09:56,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:09:56,501 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-22 16:09:56,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:56,502 INFO L225 Difference]: With dead ends: 75 [2018-10-22 16:09:56,502 INFO L226 Difference]: Without dead ends: 70 [2018-10-22 16:09:56,504 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:09:56,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-22 16:09:56,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-22 16:09:56,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-22 16:09:56,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-22 16:09:56,507 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-22 16:09:56,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:56,508 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-22 16:09:56,508 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:09:56,508 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-22 16:09:56,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-22 16:09:56,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:56,509 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:56,509 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:56,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:56,509 INFO L82 PathProgramCache]: Analyzing trace with hash -2126816035, now seen corresponding path program 19 times [2018-10-22 16:09:56,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:56,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:56,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,511 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:56,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:56,743 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:56,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:56,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:56,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:56,744 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 16:09:56,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:56,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:56,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:56,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:56,779 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:56,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,303 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,323 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 16:09:57,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,339 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:57,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,379 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,379 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:57,392 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:57,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-22 16:09:57,394 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:57,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:09:57,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:09:57,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:09:57,396 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-22 16:09:57,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:57,514 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-22 16:09:57,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:09:57,515 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-22 16:09:57,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:57,516 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:09:57,516 INFO L226 Difference]: Without dead ends: 73 [2018-10-22 16:09:57,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:09:57,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-22 16:09:57,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-22 16:09:57,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:09:57,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-22 16:09:57,520 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-22 16:09:57,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:57,521 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-22 16:09:57,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:09:57,521 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-22 16:09:57,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:09:57,521 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:57,521 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:57,522 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:57,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:57,522 INFO L82 PathProgramCache]: Analyzing trace with hash 108043225, now seen corresponding path program 20 times [2018-10-22 16:09:57,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:57,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:57,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:57,523 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:57,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:57,915 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,916 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:57,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:57,916 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:57,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:57,916 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 16:09:57,924 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:57,925 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:57,940 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:57,940 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:57,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:57,955 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:57,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,531 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,551 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 16:09:58,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:58,573 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:58,601 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:58,601 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:58,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:58,613 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,613 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,637 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:58,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:58,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-22 16:09:58,639 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:58,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:09:58,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:09:58,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:09:58,642 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-22 16:09:58,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:58,843 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-22 16:09:58,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:09:58,845 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-22 16:09:58,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:58,846 INFO L225 Difference]: With dead ends: 81 [2018-10-22 16:09:58,847 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:09:58,848 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 263 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:09:58,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:09:58,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-22 16:09:58,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:09:58,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-22 16:09:58,850 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-22 16:09:58,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:58,851 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-22 16:09:58,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:09:58,851 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-22 16:09:58,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:09:58,851 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:58,852 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:58,852 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:58,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:58,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1782764707, now seen corresponding path program 21 times [2018-10-22 16:09:58,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:58,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:58,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:58,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:58,854 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:58,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:59,554 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,555 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:59,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:59,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:59,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:59,555 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 16:09:59,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:59,563 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:59,633 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:09:59,634 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:59,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,646 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:09:59,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,232 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 16:10:00,248 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:00,248 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:00,365 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:10:00,365 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:00,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:00,377 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,388 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:00,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 46 [2018-10-22 16:10:00,389 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:00,390 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:10:00,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:10:00,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:10:00,391 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-10-22 16:10:00,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:00,461 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-22 16:10:00,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:10:00,461 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-22 16:10:00,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:00,462 INFO L225 Difference]: With dead ends: 84 [2018-10-22 16:10:00,463 INFO L226 Difference]: Without dead ends: 79 [2018-10-22 16:10:00,464 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:10:00,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-22 16:10:00,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-22 16:10:00,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-22 16:10:00,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-22 16:10:00,467 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-22 16:10:00,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:00,468 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-22 16:10:00,468 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:10:00,468 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-22 16:10:00,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:10:00,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:00,468 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:00,469 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:00,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:00,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1949187417, now seen corresponding path program 22 times [2018-10-22 16:10:00,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:00,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:00,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:00,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:00,470 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:00,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:00,810 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,811 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:00,811 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:00,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:00,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,811 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 16:10:00,820 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:00,820 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:00,832 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:00,832 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:00,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:00,843 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:00,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:01,436 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:01,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:01,458 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 16:10:01,473 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:01,474 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:01,508 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:01,508 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:01,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:01,520 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:01,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:01,566 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:01,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:01,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-10-22 16:10:01,567 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:01,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:10:01,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:10:01,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:10:01,569 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 25 states. [2018-10-22 16:10:01,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:01,637 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-22 16:10:01,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:10:01,647 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-22 16:10:01,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:01,648 INFO L225 Difference]: With dead ends: 87 [2018-10-22 16:10:01,648 INFO L226 Difference]: Without dead ends: 82 [2018-10-22 16:10:01,649 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:10:01,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-22 16:10:01,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-22 16:10:01,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-22 16:10:01,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-22 16:10:01,652 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-22 16:10:01,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:01,652 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-22 16:10:01,652 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:10:01,653 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-22 16:10:01,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-22 16:10:01,653 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:01,653 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:01,654 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:01,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:01,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1011489245, now seen corresponding path program 23 times [2018-10-22 16:10:01,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:01,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:01,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:01,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:01,655 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:01,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:02,018 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:02,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:02,018 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:02,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:02,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:02,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:02,018 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 16:10:02,025 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:02,025 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:02,044 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:10:02,044 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:02,046 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:02,058 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:02,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:02,758 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:02,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:02,778 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 16:10:02,795 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:02,795 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:02,911 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:10:02,911 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:02,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:02,924 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:02,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:02,934 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:02,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:02,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-10-22 16:10:02,935 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:02,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:10:02,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:10:02,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:10:02,937 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 26 states. [2018-10-22 16:10:03,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:03,044 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-22 16:10:03,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:10:03,044 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-10-22 16:10:03,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:03,045 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:10:03,046 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:10:03,047 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:10:03,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:10:03,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-22 16:10:03,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-22 16:10:03,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-22 16:10:03,050 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-22 16:10:03,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:03,051 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-22 16:10:03,051 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:10:03,051 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-22 16:10:03,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-22 16:10:03,052 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:03,052 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:03,052 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:03,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:03,052 INFO L82 PathProgramCache]: Analyzing trace with hash 512540377, now seen corresponding path program 24 times [2018-10-22 16:10:03,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:03,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:03,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:03,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:03,053 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:03,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:03,419 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,419 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:03,419 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:03,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:03,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:03,420 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 16:10:03,427 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:03,427 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:03,450 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:10:03,450 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:03,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:03,466 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:03,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:04,193 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:04,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:04,214 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 16:10:04,228 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:04,228 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:04,369 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:10:04,369 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:04,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:04,382 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:04,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:04,445 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:04,446 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:04,446 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 52 [2018-10-22 16:10:04,447 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:04,447 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:10:04,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:10:04,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:04,449 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 27 states. [2018-10-22 16:10:04,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:04,583 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-22 16:10:04,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:10:04,583 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-22 16:10:04,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:04,584 INFO L225 Difference]: With dead ends: 93 [2018-10-22 16:10:04,585 INFO L226 Difference]: Without dead ends: 88 [2018-10-22 16:10:04,586 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:04,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-22 16:10:04,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-22 16:10:04,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-22 16:10:04,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-22 16:10:04,590 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-22 16:10:04,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:04,590 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-22 16:10:04,590 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:10:04,590 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-22 16:10:04,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-22 16:10:04,591 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:04,591 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:04,591 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:04,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:04,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1208625245, now seen corresponding path program 25 times [2018-10-22 16:10:04,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:04,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:04,592 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:04,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:04,592 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:04,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,545 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:05,545 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:05,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:05,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,545 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 16:10:05,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:05,553 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:05,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:05,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:05,583 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:05,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:06,503 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:06,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,524 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 16:10:06,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:06,541 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:06,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:06,574 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:06,586 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:06,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:06,622 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:06,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:06,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 54 [2018-10-22 16:10:06,623 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:06,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:10:06,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:10:06,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:10:06,625 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 28 states. [2018-10-22 16:10:06,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:06,728 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-22 16:10:06,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:10:06,729 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-10-22 16:10:06,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:06,730 INFO L225 Difference]: With dead ends: 96 [2018-10-22 16:10:06,730 INFO L226 Difference]: Without dead ends: 91 [2018-10-22 16:10:06,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:10:06,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-22 16:10:06,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-22 16:10:06,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:10:06,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-22 16:10:06,735 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-22 16:10:06,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:06,735 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-22 16:10:06,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:10:06,735 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-22 16:10:06,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:10:06,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:06,736 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:06,736 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:06,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:06,737 INFO L82 PathProgramCache]: Analyzing trace with hash -2124144551, now seen corresponding path program 26 times [2018-10-22 16:10:06,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:06,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:06,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:06,738 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:06,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:07,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,600 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:07,600 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:07,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:07,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,600 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 16:10:07,611 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:07,611 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:07,631 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:07,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:07,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:07,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:08,698 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 16:10:08,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:08,714 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:08,749 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:08,750 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:08,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:08,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:08,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 56 [2018-10-22 16:10:08,784 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:08,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:10:08,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:10:08,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:10:08,786 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 29 states. [2018-10-22 16:10:08,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:08,868 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-22 16:10:08,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:10:08,869 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-10-22 16:10:08,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:08,871 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:10:08,871 INFO L226 Difference]: Without dead ends: 94 [2018-10-22 16:10:08,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 329 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:10:08,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-22 16:10:08,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-22 16:10:08,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-22 16:10:08,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-22 16:10:08,876 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-22 16:10:08,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:08,876 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-22 16:10:08,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:10:08,876 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-22 16:10:08,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-22 16:10:08,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:08,877 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:08,877 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:08,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:08,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1910155555, now seen corresponding path program 27 times [2018-10-22 16:10:08,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:08,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:08,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,878 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:08,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:09,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,241 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:09,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:09,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:09,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,242 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 16:10:09,248 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:09,249 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:09,299 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:10:09,299 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:09,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:09,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:09,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:10,598 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 16:10:10,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:10,613 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:10,777 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:10:10,777 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:10,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:10,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:10,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:10,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 58 [2018-10-22 16:10:10,839 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:10,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:10:10,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:10:10,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:10:10,841 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 30 states. [2018-10-22 16:10:10,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:10,941 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-22 16:10:10,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:10:10,942 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-10-22 16:10:10,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:10,942 INFO L225 Difference]: With dead ends: 102 [2018-10-22 16:10:10,943 INFO L226 Difference]: Without dead ends: 97 [2018-10-22 16:10:10,943 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:10:10,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-22 16:10:10,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-22 16:10:10,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-22 16:10:10,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-22 16:10:10,947 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-22 16:10:10,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:10,947 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-22 16:10:10,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:10:10,947 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-22 16:10:10,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 16:10:10,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:10,947 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:10,948 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:10,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:10,948 INFO L82 PathProgramCache]: Analyzing trace with hash -695442983, now seen corresponding path program 28 times [2018-10-22 16:10:10,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:10,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:10,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:10,949 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:10,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:11,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:11,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:11,336 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:11,336 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:11,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:11,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:11,337 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 16:10:11,344 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:11,344 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:11,361 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:11,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:11,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:11,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:11,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:12,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:12,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:12,489 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 16:10:12,519 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:12,520 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:12,561 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:12,561 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:12,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:12,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:12,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:12,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:12,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:12,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 60 [2018-10-22 16:10:12,646 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:12,646 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:10:12,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:10:12,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:10:12,647 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 31 states. [2018-10-22 16:10:12,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:12,809 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-22 16:10:12,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:10:12,810 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-10-22 16:10:12,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:12,812 INFO L225 Difference]: With dead ends: 105 [2018-10-22 16:10:12,812 INFO L226 Difference]: Without dead ends: 100 [2018-10-22 16:10:12,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 351 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:10:12,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-22 16:10:12,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-22 16:10:12,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-22 16:10:12,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-22 16:10:12,818 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-22 16:10:12,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:12,818 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-22 16:10:12,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:10:12,818 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-22 16:10:12,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-22 16:10:12,819 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:12,819 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:12,819 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:12,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:12,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1707320669, now seen corresponding path program 29 times [2018-10-22 16:10:12,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:12,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:12,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,821 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:12,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:13,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,893 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:13,893 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:13,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:13,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,894 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 16:10:13,903 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:13,903 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:13,928 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:10:13,929 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:13,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:13,948 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:13,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:16,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,167 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 16:10:16,181 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:16,182 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:16,356 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:10:16,356 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:16,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:16,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:16,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:16,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:16,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 62 [2018-10-22 16:10:16,430 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:16,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:10:16,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:10:16,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:10:16,432 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 32 states. [2018-10-22 16:10:16,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:16,645 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-22 16:10:16,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:10:16,646 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-10-22 16:10:16,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:16,647 INFO L225 Difference]: With dead ends: 108 [2018-10-22 16:10:16,647 INFO L226 Difference]: Without dead ends: 103 [2018-10-22 16:10:16,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:10:16,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-22 16:10:16,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-22 16:10:16,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-22 16:10:16,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-22 16:10:16,653 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-22 16:10:16,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:16,653 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-22 16:10:16,653 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:10:16,653 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-22 16:10:16,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-22 16:10:16,654 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:16,654 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:16,654 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:16,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:16,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1780645031, now seen corresponding path program 30 times [2018-10-22 16:10:16,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:16,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:16,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:16,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:16,656 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:16,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:17,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:17,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:17,358 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:17,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:17,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:17,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:17,358 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 16:10:17,367 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:17,367 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:17,396 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-10-22 16:10:17,396 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:17,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:17,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:17,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:18,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:18,529 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 16:10:18,544 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:18,544 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:18,737 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2018-10-22 16:10:18,737 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:18,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:18,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:18,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:18,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:18,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 64 [2018-10-22 16:10:18,782 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:18,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:10:18,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:10:18,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-22 16:10:18,784 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 33 states. [2018-10-22 16:10:18,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:18,938 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-22 16:10:18,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:10:18,938 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-10-22 16:10:18,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:18,940 INFO L225 Difference]: With dead ends: 111 [2018-10-22 16:10:18,940 INFO L226 Difference]: Without dead ends: 106 [2018-10-22 16:10:18,941 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-22 16:10:18,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-22 16:10:18,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-22 16:10:18,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-22 16:10:18,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-22 16:10:18,945 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-22 16:10:18,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:18,945 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-22 16:10:18,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:10:18,946 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-22 16:10:18,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-22 16:10:18,946 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:18,947 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:18,947 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:18,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:18,947 INFO L82 PathProgramCache]: Analyzing trace with hash 671945693, now seen corresponding path program 31 times [2018-10-22 16:10:18,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:18,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:18,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,949 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:18,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,116 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:20,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:20,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:20,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,116 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:20,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:20,125 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:20,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,158 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:20,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:21,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:21,265 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:21,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:21,280 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:21,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:21,316 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:21,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:21,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:21,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:21,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 66 [2018-10-22 16:10:21,401 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:21,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:10:21,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:10:21,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 16:10:21,402 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 34 states. [2018-10-22 16:10:21,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:21,526 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-22 16:10:21,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:10:21,526 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-10-22 16:10:21,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:21,527 INFO L225 Difference]: With dead ends: 114 [2018-10-22 16:10:21,528 INFO L226 Difference]: Without dead ends: 109 [2018-10-22 16:10:21,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 384 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 16:10:21,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-22 16:10:21,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-22 16:10:21,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-22 16:10:21,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-22 16:10:21,534 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-22 16:10:21,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:21,534 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-22 16:10:21,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:10:21,534 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-22 16:10:21,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-22 16:10:21,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:21,535 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:21,535 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:21,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:21,536 INFO L82 PathProgramCache]: Analyzing trace with hash -181435175, now seen corresponding path program 32 times [2018-10-22 16:10:21,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:21,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:21,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:21,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:21,537 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:21,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:22,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,078 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:22,078 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:22,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:22,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,078 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:22,086 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:22,086 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:22,102 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:22,103 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:22,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:22,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:22,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:23,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:23,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,290 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:23,304 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:23,305 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:23,345 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:23,345 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:23,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:23,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:23,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:23,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 68 [2018-10-22 16:10:23,389 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:23,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:10:23,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:10:23,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:10:23,391 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 35 states. [2018-10-22 16:10:23,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:23,588 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-22 16:10:23,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:10:23,589 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-10-22 16:10:23,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:23,590 INFO L225 Difference]: With dead ends: 117 [2018-10-22 16:10:23,590 INFO L226 Difference]: Without dead ends: 112 [2018-10-22 16:10:23,590 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:10:23,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-22 16:10:23,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-22 16:10:23,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-22 16:10:23,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-22 16:10:23,594 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-22 16:10:23,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:23,594 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-22 16:10:23,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:10:23,594 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-22 16:10:23,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-22 16:10:23,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:23,595 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:23,596 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:23,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:23,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1339448739, now seen corresponding path program 33 times [2018-10-22 16:10:23,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:23,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:23,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:23,597 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:23,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:24,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:24,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:24,166 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:24,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:24,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:24,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:24,166 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:24,174 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:24,174 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:24,204 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-22 16:10:24,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:24,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:24,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:24,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:25,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:25,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:25,853 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:25,868 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:25,868 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:26,092 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-22 16:10:26,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:26,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,112 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:26,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,142 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:26,142 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 70 [2018-10-22 16:10:26,142 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:26,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:10:26,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:10:26,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:10:26,144 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 36 states. [2018-10-22 16:10:26,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:26,299 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-22 16:10:26,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:10:26,299 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-10-22 16:10:26,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:26,300 INFO L225 Difference]: With dead ends: 120 [2018-10-22 16:10:26,301 INFO L226 Difference]: Without dead ends: 115 [2018-10-22 16:10:26,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:10:26,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-22 16:10:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-22 16:10:26,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-22 16:10:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-22 16:10:26,305 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-22 16:10:26,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:26,306 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-22 16:10:26,306 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:10:26,306 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-22 16:10:26,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-22 16:10:26,307 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:26,307 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:26,307 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:26,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:26,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1750754905, now seen corresponding path program 34 times [2018-10-22 16:10:26,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:26,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:26,308 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:26,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:26,308 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:26,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:26,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:26,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:26,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:26,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:26,869 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:26,869 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:26,887 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:26,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:26,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:26,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:28,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:28,477 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:28,477 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:28,521 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:28,521 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:28,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:28,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:28,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:28,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:28,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 72 [2018-10-22 16:10:28,567 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:28,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:10:28,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:10:28,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:10:28,569 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 37 states. [2018-10-22 16:10:28,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:28,705 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-22 16:10:28,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:10:28,705 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-10-22 16:10:28,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:28,706 INFO L225 Difference]: With dead ends: 123 [2018-10-22 16:10:28,706 INFO L226 Difference]: Without dead ends: 118 [2018-10-22 16:10:28,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 417 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:10:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-22 16:10:28,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-22 16:10:28,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-22 16:10:28,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-22 16:10:28,711 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-22 16:10:28,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:28,711 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-22 16:10:28,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:10:28,711 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-22 16:10:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-22 16:10:28,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:28,712 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:28,712 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:28,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:28,713 INFO L82 PathProgramCache]: Analyzing trace with hash -616476451, now seen corresponding path program 35 times [2018-10-22 16:10:28,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:28,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:28,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:28,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:28,714 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:28,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:29,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:29,424 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:29,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:29,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:29,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:29,424 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:29,432 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:29,432 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:29,466 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2018-10-22 16:10:29,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:29,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:29,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:29,483 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:31,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:31,252 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:31,267 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:31,267 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:31,480 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2018-10-22 16:10:31,480 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:31,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:31,504 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:31,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:31,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:31,557 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 74 [2018-10-22 16:10:31,557 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:31,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:10:31,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:10:31,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:10:31,558 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 38 states. [2018-10-22 16:10:31,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:31,675 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-22 16:10:31,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:10:31,676 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-10-22 16:10:31,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:31,678 INFO L225 Difference]: With dead ends: 126 [2018-10-22 16:10:31,678 INFO L226 Difference]: Without dead ends: 121 [2018-10-22 16:10:31,678 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 428 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:10:31,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-22 16:10:31,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-22 16:10:31,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-22 16:10:31,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-22 16:10:31,681 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-22 16:10:31,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:31,681 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-22 16:10:31,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:10:31,681 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-22 16:10:31,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-22 16:10:31,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:31,682 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:31,683 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:31,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:31,683 INFO L82 PathProgramCache]: Analyzing trace with hash 557197273, now seen corresponding path program 36 times [2018-10-22 16:10:31,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:31,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,684 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:31,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:31,684 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:31,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:32,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:32,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,307 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:32,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:32,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:32,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:32,308 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:32,314 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:32,314 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:32,346 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2018-10-22 16:10:32,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:32,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:32,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:32,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:33,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:33,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:33,870 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:33,885 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:33,885 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:34,146 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2018-10-22 16:10:34,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:34,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:34,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:34,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:34,245 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:34,245 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 76 [2018-10-22 16:10:34,246 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:34,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:10:34,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:10:34,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-22 16:10:34,247 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 39 states. [2018-10-22 16:10:34,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:34,432 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-22 16:10:34,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:10:34,433 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-22 16:10:34,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:34,434 INFO L225 Difference]: With dead ends: 129 [2018-10-22 16:10:34,434 INFO L226 Difference]: Without dead ends: 124 [2018-10-22 16:10:34,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-22 16:10:34,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-22 16:10:34,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-22 16:10:34,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-22 16:10:34,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-22 16:10:34,438 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-22 16:10:34,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:34,439 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-22 16:10:34,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:10:34,439 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-22 16:10:34,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-22 16:10:34,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:34,440 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:34,440 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:34,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:34,440 INFO L82 PathProgramCache]: Analyzing trace with hash 142352221, now seen corresponding path program 37 times [2018-10-22 16:10:34,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:34,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:34,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:34,441 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:34,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:35,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:35,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,930 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:35,930 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:35,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:35,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,930 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:35,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:35,938 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:35,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:35,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:35,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:35,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:37,824 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:37,844 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:37,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:37,859 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:37,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:37,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:37,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:37,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:37,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:37,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 78 [2018-10-22 16:10:37,981 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:37,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:10:37,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:10:37,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:10:37,982 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 40 states. [2018-10-22 16:10:38,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:38,126 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-22 16:10:38,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:10:38,129 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-22 16:10:38,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:38,130 INFO L225 Difference]: With dead ends: 132 [2018-10-22 16:10:38,130 INFO L226 Difference]: Without dead ends: 127 [2018-10-22 16:10:38,131 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:10:38,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-22 16:10:38,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-22 16:10:38,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-22 16:10:38,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-22 16:10:38,134 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-22 16:10:38,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:38,135 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-22 16:10:38,135 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:10:38,135 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-22 16:10:38,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-22 16:10:38,135 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:38,136 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:38,136 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:38,136 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:38,136 INFO L82 PathProgramCache]: Analyzing trace with hash -1885681319, now seen corresponding path program 38 times [2018-10-22 16:10:38,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:38,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:38,137 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:38,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:38,137 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:38,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:38,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:38,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:38,826 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:38,827 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:38,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:38,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:38,827 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:38,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:38,834 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:38,855 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:38,855 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:38,858 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:38,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:38,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:40,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:40,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:40,967 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:40,982 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:40,982 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:41,030 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:41,030 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:41,034 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:41,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:41,051 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:41,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:41,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:41,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 80 [2018-10-22 16:10:41,071 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:41,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:10:41,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:10:41,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:10:41,072 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 41 states. [2018-10-22 16:10:41,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:41,229 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-22 16:10:41,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 16:10:41,231 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-10-22 16:10:41,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:41,232 INFO L225 Difference]: With dead ends: 135 [2018-10-22 16:10:41,232 INFO L226 Difference]: Without dead ends: 130 [2018-10-22 16:10:41,233 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 16:10:41,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-22 16:10:41,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-22 16:10:41,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-22 16:10:41,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-22 16:10:41,236 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-22 16:10:41,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:41,237 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-22 16:10:41,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-22 16:10:41,237 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-22 16:10:41,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-22 16:10:41,238 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:41,238 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:41,238 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:41,238 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:41,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1727918627, now seen corresponding path program 39 times [2018-10-22 16:10:41,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:41,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:41,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:41,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:41,239 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:41,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:41,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:41,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:41,934 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:41,934 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:41,934 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:41,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:41,934 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:41,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:41,942 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:41,980 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:10:41,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:41,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:42,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:42,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:43,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:43,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:43,766 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:43,781 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:43,781 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:44,080 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:10:44,080 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:44,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:44,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:44,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:44,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:44,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:44,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42, 42, 42] total 82 [2018-10-22 16:10:44,153 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:44,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:10:44,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:10:44,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-22 16:10:44,154 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 42 states. [2018-10-22 16:10:44,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:44,568 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-22 16:10:44,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-22 16:10:44,571 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-10-22 16:10:44,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:44,572 INFO L225 Difference]: With dead ends: 138 [2018-10-22 16:10:44,572 INFO L226 Difference]: Without dead ends: 133 [2018-10-22 16:10:44,573 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-22 16:10:44,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-22 16:10:44,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-22 16:10:44,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-22 16:10:44,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-22 16:10:44,577 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-22 16:10:44,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:44,577 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-22 16:10:44,577 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:10:44,577 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-22 16:10:44,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-22 16:10:44,578 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:44,578 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:44,578 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:44,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:44,579 INFO L82 PathProgramCache]: Analyzing trace with hash -513783079, now seen corresponding path program 40 times [2018-10-22 16:10:44,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:44,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:44,579 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:44,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:44,580 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:44,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:45,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:45,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:45,586 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:45,586 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:45,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:45,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:45,587 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:45,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:45,595 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:45,622 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:45,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:45,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:45,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:45,648 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:47,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,507 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:47,522 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:47,522 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:47,576 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:47,576 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:47,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,602 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:47,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:47,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:47,679 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 84 [2018-10-22 16:10:47,679 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:47,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-22 16:10:47,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-22 16:10:47,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:10:47,681 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 43 states. [2018-10-22 16:10:48,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:48,284 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-22 16:10:48,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:10:48,286 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-22 16:10:48,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:48,287 INFO L225 Difference]: With dead ends: 141 [2018-10-22 16:10:48,288 INFO L226 Difference]: Without dead ends: 136 [2018-10-22 16:10:48,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:10:48,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-22 16:10:48,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-22 16:10:48,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-22 16:10:48,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-22 16:10:48,292 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-22 16:10:48,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:48,292 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-22 16:10:48,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-22 16:10:48,292 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-22 16:10:48,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-22 16:10:48,293 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:48,293 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:48,293 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:48,294 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:48,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1878727773, now seen corresponding path program 41 times [2018-10-22 16:10:48,294 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:48,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:48,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:48,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:48,295 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:48,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:49,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:49,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,141 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:49,141 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:49,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:49,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,141 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:49,149 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:49,149 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:49,190 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2018-10-22 16:10:49,190 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:49,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:49,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:49,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:51,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:51,616 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:51,631 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:51,631 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:51,904 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2018-10-22 16:10:51,904 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:51,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:51,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:51,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:51,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:51,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 86 [2018-10-22 16:10:51,953 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:51,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-22 16:10:51,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-22 16:10:51,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:10:51,955 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 44 states. [2018-10-22 16:10:52,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:52,669 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-22 16:10:52,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-22 16:10:52,669 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-22 16:10:52,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:52,671 INFO L225 Difference]: With dead ends: 144 [2018-10-22 16:10:52,671 INFO L226 Difference]: Without dead ends: 139 [2018-10-22 16:10:52,671 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:10:52,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-22 16:10:52,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-22 16:10:52,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-22 16:10:52,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-22 16:10:52,675 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-22 16:10:52,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:52,676 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-22 16:10:52,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-22 16:10:52,676 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-22 16:10:52,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-22 16:10:52,677 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:52,677 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:52,677 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:52,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:52,678 INFO L82 PathProgramCache]: Analyzing trace with hash -2107724711, now seen corresponding path program 42 times [2018-10-22 16:10:52,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:52,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:52,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,679 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:52,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:53,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:53,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,721 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:53,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:53,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:53,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,721 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:53,730 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:53,730 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:53,769 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2018-10-22 16:10:53,769 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:53,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:53,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:53,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:56,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:56,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:56,157 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:56,172 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:56,172 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:56,493 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2018-10-22 16:10:56,494 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:56,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:56,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:56,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:56,575 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:56,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:56,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 88 [2018-10-22 16:10:56,576 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:56,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:10:56,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:10:56,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:10:56,577 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 45 states. [2018-10-22 16:10:56,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:56,743 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-22 16:10:56,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:10:56,744 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-10-22 16:10:56,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:56,745 INFO L225 Difference]: With dead ends: 147 [2018-10-22 16:10:56,745 INFO L226 Difference]: Without dead ends: 142 [2018-10-22 16:10:56,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:10:56,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-22 16:10:56,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-22 16:10:56,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-22 16:10:56,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-22 16:10:56,750 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-22 16:10:56,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:56,750 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-22 16:10:56,750 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:10:56,750 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-22 16:10:56,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-22 16:10:56,751 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:56,751 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:56,751 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:56,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:56,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1921993437, now seen corresponding path program 43 times [2018-10-22 16:10:56,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:56,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:56,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:56,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:56,753 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:56,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:57,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:57,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:57,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:57,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:57,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:57,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:57,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:57,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:57,876 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:57,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:57,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:57,920 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:10:57,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:59,996 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:00,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:00,016 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:00,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:00,032 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:00,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:00,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:00,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:00,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:00,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:00,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:00,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 90 [2018-10-22 16:11:00,129 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:00,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:11:00,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:11:00,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-22 16:11:00,131 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 46 states. [2018-10-22 16:11:00,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:00,306 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-22 16:11:00,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:11:00,307 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-10-22 16:11:00,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:00,308 INFO L225 Difference]: With dead ends: 150 [2018-10-22 16:11:00,308 INFO L226 Difference]: Without dead ends: 145 [2018-10-22 16:11:00,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 516 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-22 16:11:00,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-22 16:11:00,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-22 16:11:00,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-22 16:11:00,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-22 16:11:00,313 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-22 16:11:00,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:00,313 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-22 16:11:00,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:11:00,313 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-22 16:11:00,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-22 16:11:00,314 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:00,314 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:00,314 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:00,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:00,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1670517287, now seen corresponding path program 44 times [2018-10-22 16:11:00,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:00,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:00,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:00,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:00,316 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:00,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:01,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:01,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:01,827 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:01,827 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:01,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:01,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:01,827 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:01,835 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:01,835 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:01,857 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:01,858 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:01,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:01,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:04,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:04,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:04,037 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:04,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:04,051 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:04,103 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:04,103 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:04,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:04,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:04,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:04,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:04,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:04,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 92 [2018-10-22 16:11:04,209 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:04,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-22 16:11:04,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-22 16:11:04,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:11:04,211 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 47 states. [2018-10-22 16:11:04,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:04,393 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-22 16:11:04,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-22 16:11:04,393 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-10-22 16:11:04,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:04,395 INFO L225 Difference]: With dead ends: 153 [2018-10-22 16:11:04,395 INFO L226 Difference]: Without dead ends: 148 [2018-10-22 16:11:04,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 527 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:11:04,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-22 16:11:04,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-22 16:11:04,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-22 16:11:04,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-22 16:11:04,400 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-22 16:11:04,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:04,401 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-22 16:11:04,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-22 16:11:04,401 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-22 16:11:04,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-22 16:11:04,401 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:04,402 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:04,402 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:04,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:04,402 INFO L82 PathProgramCache]: Analyzing trace with hash 132553053, now seen corresponding path program 45 times [2018-10-22 16:11:04,402 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:04,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:04,403 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:04,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:04,403 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:04,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:05,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:05,271 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:05,271 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:05,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:05,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:05,272 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:05,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:05,280 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:05,322 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-10-22 16:11:05,322 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:05,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:05,344 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:05,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:07,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:07,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:07,859 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 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:07,874 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:07,874 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:08,233 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-10-22 16:11:08,233 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:08,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:08,257 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:08,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:08,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:08,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:08,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48, 48, 48] total 94 [2018-10-22 16:11:08,290 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:08,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-22 16:11:08,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-22 16:11:08,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-22 16:11:08,291 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 48 states. [2018-10-22 16:11:08,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:08,513 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-22 16:11:08,513 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-22 16:11:08,513 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-10-22 16:11:08,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:08,515 INFO L225 Difference]: With dead ends: 156 [2018-10-22 16:11:08,515 INFO L226 Difference]: Without dead ends: 151 [2018-10-22 16:11:08,516 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 538 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-22 16:11:08,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-22 16:11:08,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-22 16:11:08,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-22 16:11:08,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-22 16:11:08,520 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-22 16:11:08,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:08,520 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-22 16:11:08,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-22 16:11:08,521 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-22 16:11:08,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-22 16:11:08,521 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:08,521 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:08,522 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:08,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:08,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1754919079, now seen corresponding path program 46 times [2018-10-22 16:11:08,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:08,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:08,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:08,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:08,523 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:08,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:09,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:09,664 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:09,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:09,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:09,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:09,665 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:09,675 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:09,675 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:09,699 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:09,699 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:09,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:09,724 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:09,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:12,259 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:12,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:12,279 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:12,293 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:12,293 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:12,353 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:12,353 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:12,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:12,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:12,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:12,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:12,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:12,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 96 [2018-10-22 16:11:12,408 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:12,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-22 16:11:12,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-22 16:11:12,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:11:12,409 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 49 states. [2018-10-22 16:11:12,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:12,561 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-22 16:11:12,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:11:12,563 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-10-22 16:11:12,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:12,564 INFO L225 Difference]: With dead ends: 159 [2018-10-22 16:11:12,564 INFO L226 Difference]: Without dead ends: 154 [2018-10-22 16:11:12,565 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 549 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:11:12,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-22 16:11:12,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-22 16:11:12,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-22 16:11:12,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-22 16:11:12,569 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-22 16:11:12,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:12,569 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-22 16:11:12,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-22 16:11:12,569 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-22 16:11:12,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-22 16:11:12,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:12,570 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:12,571 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:12,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:12,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1725364259, now seen corresponding path program 47 times [2018-10-22 16:11:12,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:12,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:12,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:12,572 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:12,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:13,504 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:13,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,504 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:13,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:13,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:13,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:13,505 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:13,513 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:13,513 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:13,555 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2018-10-22 16:11:13,555 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:13,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:13,580 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:13,580 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:16,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:16,118 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:16,118 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:16,134 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:16,134 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:16,470 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2018-10-22 16:11:16,471 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:16,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:16,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:16,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:16,520 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:16,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:16,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 98 [2018-10-22 16:11:16,521 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:16,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-22 16:11:16,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-22 16:11:16,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-22 16:11:16,523 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 50 states. [2018-10-22 16:11:16,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:16,693 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-22 16:11:16,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-22 16:11:16,694 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 152 [2018-10-22 16:11:16,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:16,695 INFO L225 Difference]: With dead ends: 162 [2018-10-22 16:11:16,695 INFO L226 Difference]: Without dead ends: 157 [2018-10-22 16:11:16,696 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 656 GetRequests, 560 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-22 16:11:16,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-22 16:11:16,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-22 16:11:16,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-22 16:11:16,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-22 16:11:16,701 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-22 16:11:16,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:16,701 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-22 16:11:16,701 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-22 16:11:16,701 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-22 16:11:16,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-22 16:11:16,702 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:16,702 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:16,702 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:16,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:16,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1726017319, now seen corresponding path program 48 times [2018-10-22 16:11:16,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:16,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:16,703 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:16,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:16,703 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:16,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:17,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:17,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:17,764 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:17,764 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:17,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:17,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:17,765 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:17,773 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:17,774 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:17,816 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:11:17,816 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:17,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:17,843 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:17,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:20,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:20,420 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:20,438 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:20,438 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:20,829 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:11:20,829 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:20,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:20,856 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:20,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:20,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:20,890 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:20,890 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 100 [2018-10-22 16:11:20,890 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:20,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:11:20,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:11:20,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-22 16:11:20,891 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 51 states. [2018-10-22 16:11:21,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:21,147 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-22 16:11:21,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:11:21,148 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 155 [2018-10-22 16:11:21,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:21,149 INFO L225 Difference]: With dead ends: 165 [2018-10-22 16:11:21,149 INFO L226 Difference]: Without dead ends: 160 [2018-10-22 16:11:21,150 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 571 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-22 16:11:21,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-22 16:11:21,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-22 16:11:21,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-22 16:11:21,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-22 16:11:21,153 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-22 16:11:21,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:21,153 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-22 16:11:21,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:11:21,153 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-22 16:11:21,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-22 16:11:21,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:21,154 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:21,154 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:21,154 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:21,154 INFO L82 PathProgramCache]: Analyzing trace with hash 293508701, now seen corresponding path program 49 times [2018-10-22 16:11:21,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:21,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:21,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:21,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:21,155 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:21,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:22,172 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:22,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:22,172 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:22,172 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:22,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:22,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:22,172 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:22,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:22,180 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:22,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:22,209 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:22,232 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:22,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:24,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:24,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:24,929 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:24,944 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:24,944 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:24,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:25,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:25,025 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:25,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:25,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:25,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 102 [2018-10-22 16:11:25,053 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:25,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:11:25,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:11:25,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:11:25,055 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 52 states. [2018-10-22 16:11:25,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:25,219 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-22 16:11:25,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:11:25,220 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 158 [2018-10-22 16:11:25,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:25,222 INFO L225 Difference]: With dead ends: 168 [2018-10-22 16:11:25,222 INFO L226 Difference]: Without dead ends: 163 [2018-10-22 16:11:25,222 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 582 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-22 16:11:25,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-22 16:11:25,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-22 16:11:25,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-22 16:11:25,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-22 16:11:25,226 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-22 16:11:25,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:25,226 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-22 16:11:25,226 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:11:25,226 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-22 16:11:25,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-22 16:11:25,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:25,227 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:25,227 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:25,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:25,228 INFO L82 PathProgramCache]: Analyzing trace with hash 91288153, now seen corresponding path program 50 times [2018-10-22 16:11:25,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:25,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:25,229 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:25,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:25,229 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:25,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:26,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:26,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:26,601 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:26,602 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:26,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:26,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:26,602 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:26,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:26,610 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:26,660 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:26,660 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:26,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:26,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:26,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:29,483 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:29,504 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:29,519 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:29,519 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:29,579 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:29,579 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:29,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:29,604 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:29,628 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:29,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:29,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 53] total 104 [2018-10-22 16:11:29,630 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:29,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-22 16:11:29,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-22 16:11:29,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:11:29,631 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 53 states. [2018-10-22 16:11:29,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:29,798 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-22 16:11:29,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-22 16:11:29,798 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 161 [2018-10-22 16:11:29,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:29,799 INFO L225 Difference]: With dead ends: 171 [2018-10-22 16:11:29,799 INFO L226 Difference]: Without dead ends: 166 [2018-10-22 16:11:29,800 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 695 GetRequests, 593 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:11:29,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-22 16:11:29,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-22 16:11:29,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-22 16:11:29,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-22 16:11:29,804 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-22 16:11:29,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:29,805 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-22 16:11:29,805 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-22 16:11:29,805 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-22 16:11:29,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-22 16:11:29,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:29,805 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:29,806 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:29,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:29,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1578058973, now seen corresponding path program 51 times [2018-10-22 16:11:29,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:29,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:29,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:29,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:29,807 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:29,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:30,917 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:30,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:30,917 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:30,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:30,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:30,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:30,918 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:30,925 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:30,925 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:30,974 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-10-22 16:11:30,974 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:30,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:31,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:31,001 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:33,987 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:34,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:34,008 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:34,022 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:34,022 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:34,454 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-10-22 16:11:34,454 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:34,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:34,486 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:34,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:34,537 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:34,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:34,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54, 54, 54] total 106 [2018-10-22 16:11:34,539 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:34,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:11:34,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:11:34,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-22 16:11:34,541 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 54 states. [2018-10-22 16:11:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:34,730 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-22 16:11:34,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-22 16:11:34,731 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 164 [2018-10-22 16:11:34,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:34,732 INFO L225 Difference]: With dead ends: 174 [2018-10-22 16:11:34,732 INFO L226 Difference]: Without dead ends: 169 [2018-10-22 16:11:34,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 604 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-22 16:11:34,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-22 16:11:34,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-22 16:11:34,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-22 16:11:34,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-22 16:11:34,735 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-22 16:11:34,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:34,736 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-22 16:11:34,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:11:34,736 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-22 16:11:34,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-22 16:11:34,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:34,737 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:34,737 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:34,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:34,737 INFO L82 PathProgramCache]: Analyzing trace with hash -30166055, now seen corresponding path program 52 times [2018-10-22 16:11:34,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:34,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:34,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:34,738 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:34,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:36,740 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:36,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,741 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:36,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:36,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:36,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:36,741 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:36,748 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:36,748 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:36,779 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:36,779 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:36,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:36,813 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:36,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:39,762 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:39,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:39,783 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:39,798 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:39,798 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:39,865 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:39,865 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:39,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:39,897 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:39,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:39,935 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:39,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:39,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55, 55, 55] total 108 [2018-10-22 16:11:39,936 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:39,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-22 16:11:39,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-22 16:11:39,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:11:39,937 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 55 states. [2018-10-22 16:11:40,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:40,140 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-22 16:11:40,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:11:40,140 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 167 [2018-10-22 16:11:40,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:40,142 INFO L225 Difference]: With dead ends: 177 [2018-10-22 16:11:40,142 INFO L226 Difference]: Without dead ends: 172 [2018-10-22 16:11:40,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 721 GetRequests, 615 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:11:40,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-22 16:11:40,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-22 16:11:40,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-22 16:11:40,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-22 16:11:40,146 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-22 16:11:40,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:40,146 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-22 16:11:40,146 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-22 16:11:40,146 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-22 16:11:40,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-22 16:11:40,147 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:40,147 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:40,147 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:40,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:40,148 INFO L82 PathProgramCache]: Analyzing trace with hash -301788323, now seen corresponding path program 53 times [2018-10-22 16:11:40,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:40,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:40,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:40,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:40,149 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:40,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:42,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:42,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:42,634 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:42,634 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:42,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:42,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:42,635 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:42,643 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:42,643 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:42,693 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2018-10-22 16:11:42,694 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:42,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:42,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:42,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:45,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:45,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:45,806 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:45,821 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:45,821 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:46,225 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 54 check-sat command(s) [2018-10-22 16:11:46,225 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:46,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:46,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:46,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:46,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:46,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:46,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56, 56, 56] total 110 [2018-10-22 16:11:46,320 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:46,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-22 16:11:46,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-22 16:11:46,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:11:46,322 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 56 states. [2018-10-22 16:11:46,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:46,532 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-22 16:11:46,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-22 16:11:46,532 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 170 [2018-10-22 16:11:46,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:46,533 INFO L225 Difference]: With dead ends: 180 [2018-10-22 16:11:46,533 INFO L226 Difference]: Without dead ends: 175 [2018-10-22 16:11:46,534 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 734 GetRequests, 626 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:11:46,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-22 16:11:46,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-22 16:11:46,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-22 16:11:46,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-22 16:11:46,537 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-22 16:11:46,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:46,538 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-22 16:11:46,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-22 16:11:46,538 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-22 16:11:46,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-22 16:11:46,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:46,539 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:46,539 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:46,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:46,539 INFO L82 PathProgramCache]: Analyzing trace with hash -482388647, now seen corresponding path program 54 times [2018-10-22 16:11:46,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:46,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:46,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:46,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:46,540 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:46,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:47,842 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:47,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:47,842 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:47,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:47,843 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:47,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:47,843 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:47,850 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:47,850 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:47,901 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:11:47,901 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:47,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:47,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:51,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:51,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:51,157 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:51,172 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:51,173 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:51,652 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2018-10-22 16:11:51,652 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:51,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:51,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:51,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:51,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:51,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:51,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57, 57, 57] total 112 [2018-10-22 16:11:51,733 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:51,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-22 16:11:51,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-22 16:11:51,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-22 16:11:51,734 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 57 states. [2018-10-22 16:11:51,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:51,966 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-22 16:11:51,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-22 16:11:51,966 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 173 [2018-10-22 16:11:51,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:51,967 INFO L225 Difference]: With dead ends: 183 [2018-10-22 16:11:51,967 INFO L226 Difference]: Without dead ends: 178 [2018-10-22 16:11:51,967 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 637 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-22 16:11:51,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-22 16:11:51,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-22 16:11:51,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-22 16:11:51,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-22 16:11:51,971 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-22 16:11:51,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:51,971 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-22 16:11:51,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-22 16:11:51,972 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-22 16:11:51,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-22 16:11:51,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:51,972 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:51,972 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:51,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:51,973 INFO L82 PathProgramCache]: Analyzing trace with hash 847380957, now seen corresponding path program 55 times [2018-10-22 16:11:51,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:51,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:51,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:51,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:51,973 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:51,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:53,826 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,826 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:53,826 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:53,826 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:53,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,826 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 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:53,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:53,833 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:53,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:53,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:53,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:53,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:57,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:57,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:57,225 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 111 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 111 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:57,242 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:57,242 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:57,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:57,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:57,333 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:57,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:57,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:57,370 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:57,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58, 58, 58] total 114 [2018-10-22 16:11:57,370 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:57,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-22 16:11:57,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-22 16:11:57,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-22 16:11:57,372 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 58 states. [2018-10-22 16:11:57,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:57,597 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-22 16:11:57,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-22 16:11:57,598 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 176 [2018-10-22 16:11:57,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:57,599 INFO L225 Difference]: With dead ends: 186 [2018-10-22 16:11:57,600 INFO L226 Difference]: Without dead ends: 181 [2018-10-22 16:11:57,600 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 760 GetRequests, 648 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-22 16:11:57,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-22 16:11:57,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-22 16:11:57,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-22 16:11:57,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-22 16:11:57,604 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-22 16:11:57,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:57,604 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-22 16:11:57,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-22 16:11:57,604 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-22 16:11:57,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-22 16:11:57,605 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:57,605 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:57,606 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:57,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:57,606 INFO L82 PathProgramCache]: Analyzing trace with hash -764684583, now seen corresponding path program 56 times [2018-10-22 16:11:57,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:57,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:57,607 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:57,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:57,607 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:57,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:58,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:58,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:58,833 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:58,833 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:58,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:58,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:58,833 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 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:58,841 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:58,841 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:58,880 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:58,880 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:58,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:58,912 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:11:58,912 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:02,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:02,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:02,414 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 113 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 113 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:02,428 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:12:02,428 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:02,492 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:12:02,492 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:02,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:02,533 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:02,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:02,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:02,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:02,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 59, 59] total 116 [2018-10-22 16:12:02,628 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:02,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-22 16:12:02,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-22 16:12:02,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-22 16:12:02,630 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 59 states. [2018-10-22 16:12:02,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:02,850 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-22 16:12:02,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-22 16:12:02,850 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 179 [2018-10-22 16:12:02,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:02,852 INFO L225 Difference]: With dead ends: 189 [2018-10-22 16:12:02,852 INFO L226 Difference]: Without dead ends: 184 [2018-10-22 16:12:02,853 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 659 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-22 16:12:02,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-22 16:12:02,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-22 16:12:02,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-22 16:12:02,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-22 16:12:02,857 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-22 16:12:02,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:02,858 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-22 16:12:02,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-22 16:12:02,858 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-22 16:12:02,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-22 16:12:02,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:02,859 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:02,859 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:02,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:02,860 INFO L82 PathProgramCache]: Analyzing trace with hash 515117149, now seen corresponding path program 57 times [2018-10-22 16:12:02,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:02,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:02,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:02,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:02,860 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:02,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:04,093 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:04,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:04,093 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:04,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:04,093 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:04,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:04,093 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 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:04,101 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:04,102 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:04,157 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-10-22 16:12:04,157 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:04,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:04,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:04,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:07,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:07,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:07,766 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 115 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 115 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:07,781 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:07,781 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:08,309 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-10-22 16:12:08,310 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:08,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:08,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:08,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:08,385 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:08,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:08,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60, 60, 60] total 118 [2018-10-22 16:12:08,387 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:08,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-22 16:12:08,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-22 16:12:08,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-22 16:12:08,389 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 60 states. [2018-10-22 16:12:08,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:08,634 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-22 16:12:08,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-22 16:12:08,635 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 182 [2018-10-22 16:12:08,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:08,636 INFO L225 Difference]: With dead ends: 192 [2018-10-22 16:12:08,636 INFO L226 Difference]: Without dead ends: 187 [2018-10-22 16:12:08,636 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 786 GetRequests, 670 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-22 16:12:08,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-22 16:12:08,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-22 16:12:08,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-22 16:12:08,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-22 16:12:08,640 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-22 16:12:08,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:08,640 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-22 16:12:08,640 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-22 16:12:08,640 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-22 16:12:08,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-22 16:12:08,641 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:08,642 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:08,642 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:08,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:08,642 INFO L82 PathProgramCache]: Analyzing trace with hash 663828569, now seen corresponding path program 58 times [2018-10-22 16:12:08,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:08,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:08,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:08,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:08,643 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:08,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:09,968 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:09,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:09,968 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:09,968 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:09,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:09,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:09,969 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 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:09,977 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:09,977 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:10,007 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:10,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:10,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:10,042 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:10,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:13,812 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:13,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:13,834 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 117 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 117 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:13,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:13,849 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:13,922 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:13,922 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:13,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:13,957 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:13,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:13,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:13,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:13,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61, 61, 61] total 120 [2018-10-22 16:12:13,996 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:13,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-22 16:12:13,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-22 16:12:13,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-22 16:12:13,998 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 61 states. [2018-10-22 16:12:14,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:14,275 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-22 16:12:14,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-22 16:12:14,275 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 185 [2018-10-22 16:12:14,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:14,277 INFO L225 Difference]: With dead ends: 195 [2018-10-22 16:12:14,277 INFO L226 Difference]: Without dead ends: 190 [2018-10-22 16:12:14,278 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 681 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-22 16:12:14,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-22 16:12:14,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-22 16:12:14,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-22 16:12:14,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-22 16:12:14,282 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-22 16:12:14,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:14,282 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-22 16:12:14,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-22 16:12:14,282 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-22 16:12:14,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-22 16:12:14,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:14,283 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:14,284 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:14,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:14,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1480507683, now seen corresponding path program 59 times [2018-10-22 16:12:14,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:14,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:14,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:14,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:14,285 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:15,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:15,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:15,659 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:15,659 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:15,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:15,659 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 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:15,668 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:15,668 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:15,723 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-10-22 16:12:15,724 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:15,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:15,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:15,759 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:19,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:19,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:19,547 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 119 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 119 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:19,562 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:19,562 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:20,048 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 60 check-sat command(s) [2018-10-22 16:12:20,049 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:20,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:20,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:20,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:20,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:20,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:20,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62, 62, 62] total 122 [2018-10-22 16:12:20,127 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:20,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-22 16:12:20,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-22 16:12:20,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-22 16:12:20,129 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 62 states. [2018-10-22 16:12:20,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:20,368 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-22 16:12:20,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-22 16:12:20,369 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 188 [2018-10-22 16:12:20,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:20,370 INFO L225 Difference]: With dead ends: 198 [2018-10-22 16:12:20,370 INFO L226 Difference]: Without dead ends: 193 [2018-10-22 16:12:20,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 692 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-22 16:12:20,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-22 16:12:20,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-22 16:12:20,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-22 16:12:20,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-22 16:12:20,374 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-22 16:12:20,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:20,375 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-22 16:12:20,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-22 16:12:20,375 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-22 16:12:20,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-22 16:12:20,376 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:20,376 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:20,376 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:20,376 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:20,376 INFO L82 PathProgramCache]: Analyzing trace with hash -58230311, now seen corresponding path program 60 times [2018-10-22 16:12:20,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:20,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:20,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:20,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:20,377 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:20,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:21,740 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:21,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:21,741 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:21,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:21,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:21,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:21,741 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 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:21,749 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:21,749 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:12:21,805 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:12:21,805 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:21,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:21,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:21,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:25,750 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:25,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:25,770 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 121 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 121 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:25,784 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:12:25,784 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:12:26,340 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2018-10-22 16:12:26,341 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:26,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:26,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:26,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:26,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:26,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:26,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63, 63, 63] total 124 [2018-10-22 16:12:26,416 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:26,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-22 16:12:26,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-22 16:12:26,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-22 16:12:26,418 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 63 states. [2018-10-22 16:12:26,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:26,689 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-22 16:12:26,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-22 16:12:26,690 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 191 [2018-10-22 16:12:26,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:26,691 INFO L225 Difference]: With dead ends: 201 [2018-10-22 16:12:26,691 INFO L226 Difference]: Without dead ends: 196 [2018-10-22 16:12:26,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 825 GetRequests, 703 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-22 16:12:26,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-22 16:12:26,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-22 16:12:26,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-22 16:12:26,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-22 16:12:26,695 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-22 16:12:26,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:26,695 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-22 16:12:26,695 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-22 16:12:26,696 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-22 16:12:26,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-22 16:12:26,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:26,697 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:26,697 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:26,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:26,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1154583901, now seen corresponding path program 61 times [2018-10-22 16:12:26,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:26,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:26,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:26,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:26,698 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:26,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:28,886 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:28,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:28,887 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:28,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:28,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:28,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:28,887 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 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:28,895 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:28,895 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:12:28,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:28,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:28,961 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:28,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:32,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:33,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:33,000 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 123 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 123 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:33,015 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:33,016 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:12:33,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:33,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:33,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:33,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:33,157 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:33,158 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:33,158 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64, 64, 64] total 126 [2018-10-22 16:12:33,158 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:33,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-22 16:12:33,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-22 16:12:33,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-22 16:12:33,160 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 64 states. [2018-10-22 16:12:33,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:33,435 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-22 16:12:33,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-22 16:12:33,435 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 194 [2018-10-22 16:12:33,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:33,436 INFO L225 Difference]: With dead ends: 204 [2018-10-22 16:12:33,436 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:12:33,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 714 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-22 16:12:33,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:12:33,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-22 16:12:33,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-22 16:12:33,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-22 16:12:33,441 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-22 16:12:33,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:33,442 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-22 16:12:33,442 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-22 16:12:33,442 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-22 16:12:33,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-22 16:12:33,443 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:33,443 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:33,443 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:33,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:33,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1457087655, now seen corresponding path program 62 times [2018-10-22 16:12:33,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:33,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:33,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:12:33,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:33,445 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:33,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:34,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:34,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:34,921 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:34,921 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:34,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:34,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:34,921 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 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:34,929 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:12:34,929 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:34,963 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:12:34,963 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:34,965 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:35,008 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:35,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:39,100 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:39,120 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 125 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 125 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:39,137 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:12:39,138 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:39,208 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:12:39,208 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:39,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:39,247 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:39,291 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:39,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:39,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65, 65, 65] total 128 [2018-10-22 16:12:39,293 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:39,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-22 16:12:39,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-22 16:12:39,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:12:39,295 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 65 states. [2018-10-22 16:12:39,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:39,604 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-22 16:12:39,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-22 16:12:39,605 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 197 [2018-10-22 16:12:39,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:39,608 INFO L225 Difference]: With dead ends: 207 [2018-10-22 16:12:39,608 INFO L226 Difference]: Without dead ends: 202 [2018-10-22 16:12:39,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 851 GetRequests, 725 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:12:39,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-22 16:12:39,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-22 16:12:39,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-22 16:12:39,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-22 16:12:39,613 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-22 16:12:39,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:39,613 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-22 16:12:39,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-22 16:12:39,614 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-22 16:12:39,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-22 16:12:39,615 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:39,615 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:39,615 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:39,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:39,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1863121885, now seen corresponding path program 63 times [2018-10-22 16:12:39,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:39,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:39,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:39,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:39,616 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:39,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:43,420 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:43,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:43,421 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:43,421 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:43,421 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:43,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:43,421 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 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:43,428 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:43,428 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:43,620 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-10-22 16:12:43,620 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:43,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:43,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:43,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:47,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:47,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:47,877 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 127 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 127 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:47,891 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:12:47,892 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:12:48,475 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-10-22 16:12:48,476 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:48,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:48,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:48,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:48,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:48,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:48,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66, 66, 66] total 130 [2018-10-22 16:12:48,550 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:48,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-22 16:12:48,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-22 16:12:48,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-22 16:12:48,552 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 66 states. [2018-10-22 16:12:48,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:48,838 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-22 16:12:48,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-22 16:12:48,838 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 200 [2018-10-22 16:12:48,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:48,839 INFO L225 Difference]: With dead ends: 210 [2018-10-22 16:12:48,839 INFO L226 Difference]: Without dead ends: 205 [2018-10-22 16:12:48,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 864 GetRequests, 736 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-22 16:12:48,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-22 16:12:48,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-22 16:12:48,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-22 16:12:48,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-22 16:12:48,843 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-22 16:12:48,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:48,843 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-22 16:12:48,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-22 16:12:48,843 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-22 16:12:48,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-22 16:12:48,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:48,844 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:48,844 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:48,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:48,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1128701145, now seen corresponding path program 64 times [2018-10-22 16:12:48,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:48,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:48,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:48,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:48,845 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:48,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:50,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:50,382 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:50,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:50,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:50,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:50,383 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:50,393 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:50,393 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:50,421 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:50,421 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:50,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:50,460 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:50,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:54,772 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:54,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:54,791 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 129 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 129 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:12:54,807 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:12:54,807 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:12:54,883 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:12:54,884 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:54,888 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:54,932 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:54,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:12:54,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:54,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:12:54,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67, 67, 67] total 132 [2018-10-22 16:12:54,990 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:12:54,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-22 16:12:54,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-22 16:12:54,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-22 16:12:54,992 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 67 states. [2018-10-22 16:12:55,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:55,264 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-22 16:12:55,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-22 16:12:55,264 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 203 [2018-10-22 16:12:55,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:55,265 INFO L225 Difference]: With dead ends: 213 [2018-10-22 16:12:55,265 INFO L226 Difference]: Without dead ends: 208 [2018-10-22 16:12:55,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 747 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-22 16:12:55,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-22 16:12:55,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-22 16:12:55,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-22 16:12:55,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-22 16:12:55,270 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-22 16:12:55,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:55,270 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-22 16:12:55,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-22 16:12:55,270 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-22 16:12:55,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-22 16:12:55,271 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:55,271 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:55,271 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:55,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:55,271 INFO L82 PathProgramCache]: Analyzing trace with hash 563841629, now seen corresponding path program 65 times [2018-10-22 16:12:55,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:55,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:55,272 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:55,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:55,272 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:55,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:56,816 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:56,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:56,817 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:12:56,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:12:56,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:12:56,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:12:56,817 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 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:12:56,827 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:12:56,827 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:12:56,887 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 66 check-sat command(s) [2018-10-22 16:12:56,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:12:56,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:12:56,937 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:12:56,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:01,387 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:01,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:01,407 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 131 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 131 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:01,421 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:13:01,421 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:02,006 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 66 check-sat command(s) [2018-10-22 16:13:02,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:02,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:02,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:02,099 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:02,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:02,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68, 68, 68] total 134 [2018-10-22 16:13:02,100 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:02,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-22 16:13:02,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-22 16:13:02,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-22 16:13:02,102 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 68 states. [2018-10-22 16:13:02,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:02,323 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-22 16:13:02,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-22 16:13:02,323 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 206 [2018-10-22 16:13:02,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:02,325 INFO L225 Difference]: With dead ends: 216 [2018-10-22 16:13:02,325 INFO L226 Difference]: Without dead ends: 211 [2018-10-22 16:13:02,326 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 758 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-22 16:13:02,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-22 16:13:02,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-22 16:13:02,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-22 16:13:02,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-22 16:13:02,329 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-22 16:13:02,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:02,329 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-22 16:13:02,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-22 16:13:02,329 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-22 16:13:02,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-22 16:13:02,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:02,330 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:02,330 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:02,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:02,331 INFO L82 PathProgramCache]: Analyzing trace with hash 515866201, now seen corresponding path program 66 times [2018-10-22 16:13:02,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:02,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:02,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:02,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:02,331 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:02,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:03,927 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:03,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:03,928 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:03,928 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:03,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:03,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:03,928 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 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:03,936 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:03,936 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:04,014 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 67 check-sat command(s) [2018-10-22 16:13:04,014 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:04,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:04,054 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:04,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:08,679 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:08,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:08,699 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 133 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 133 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:08,713 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:13:08,714 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:13:09,344 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 67 check-sat command(s) [2018-10-22 16:13:09,344 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:09,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:09,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:09,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:09,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:09,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69, 69, 69] total 136 [2018-10-22 16:13:09,419 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:09,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-22 16:13:09,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-22 16:13:09,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-22 16:13:09,421 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 69 states. [2018-10-22 16:13:09,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:09,734 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-22 16:13:09,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-22 16:13:09,735 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-10-22 16:13:09,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:09,735 INFO L225 Difference]: With dead ends: 219 [2018-10-22 16:13:09,736 INFO L226 Difference]: Without dead ends: 214 [2018-10-22 16:13:09,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 903 GetRequests, 769 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-22 16:13:09,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-22 16:13:09,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-22 16:13:09,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-22 16:13:09,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-22 16:13:09,739 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-22 16:13:09,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:09,740 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-22 16:13:09,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-22 16:13:09,740 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-22 16:13:09,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-22 16:13:09,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:09,741 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:09,742 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:09,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:09,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1504000221, now seen corresponding path program 67 times [2018-10-22 16:13:09,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:09,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:09,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:09,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:09,743 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:09,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:11,411 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:11,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:11,411 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:11,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:11,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:11,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:11,412 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 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:11,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:11,420 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:13:11,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:11,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:11,495 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:11,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:16,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:16,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:16,300 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 135 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 135 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:16,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:16,315 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:13:16,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:16,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:16,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:16,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:16,471 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:16,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:16,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70, 70, 70] total 138 [2018-10-22 16:13:16,473 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:16,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-22 16:13:16,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-22 16:13:16,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-22 16:13:16,474 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 70 states. [2018-10-22 16:13:16,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:16,714 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-22 16:13:16,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-22 16:13:16,715 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 212 [2018-10-22 16:13:16,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:16,717 INFO L225 Difference]: With dead ends: 222 [2018-10-22 16:13:16,717 INFO L226 Difference]: Without dead ends: 217 [2018-10-22 16:13:16,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 916 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-22 16:13:16,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-22 16:13:16,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-22 16:13:16,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-22 16:13:16,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-22 16:13:16,721 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-22 16:13:16,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:16,722 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-22 16:13:16,722 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-22 16:13:16,722 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-22 16:13:16,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-22 16:13:16,723 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:16,723 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:16,723 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:16,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:16,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1298743257, now seen corresponding path program 68 times [2018-10-22 16:13:16,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:16,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:16,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:13:16,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:16,725 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:16,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:18,454 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:18,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:18,454 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:18,454 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:18,454 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:18,454 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:18,454 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 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:18,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:13:18,461 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:18,496 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:13:18,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:18,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:18,541 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:18,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:23,428 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:23,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:23,449 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 137 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 137 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:23,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:13:23,464 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:13:23,537 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:13:23,537 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:23,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:23,581 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:23,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:23,622 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:23,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:23,624 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71, 71, 71] total 140 [2018-10-22 16:13:23,624 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:23,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-22 16:13:23,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-22 16:13:23,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-22 16:13:23,625 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 71 states. [2018-10-22 16:13:23,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:23,960 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-22 16:13:23,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-22 16:13:23,961 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 215 [2018-10-22 16:13:23,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:23,961 INFO L225 Difference]: With dead ends: 225 [2018-10-22 16:13:23,962 INFO L226 Difference]: Without dead ends: 220 [2018-10-22 16:13:23,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 929 GetRequests, 791 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-22 16:13:23,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-22 16:13:23,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-22 16:13:23,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-22 16:13:23,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-22 16:13:23,965 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-22 16:13:23,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:23,965 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-22 16:13:23,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-22 16:13:23,966 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-22 16:13:23,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-22 16:13:23,966 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:23,966 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:23,967 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:23,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:23,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1773009059, now seen corresponding path program 69 times [2018-10-22 16:13:23,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:23,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:23,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:23,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:23,968 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:23,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:25,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:25,906 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:25,906 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:25,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:25,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:25,906 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 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:25,916 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:13:25,917 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:13:25,986 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 70 check-sat command(s) [2018-10-22 16:13:25,986 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:25,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:26,029 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:26,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:31,066 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:31,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:31,086 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 139 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 139 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:13:31,102 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:13:31,102 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:13:31,784 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 70 check-sat command(s) [2018-10-22 16:13:31,784 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:31,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:31,833 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:31,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:13:31,875 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:31,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:13:31,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72, 72, 72] total 142 [2018-10-22 16:13:31,876 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:13:31,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-22 16:13:31,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-22 16:13:31,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-22 16:13:31,878 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 72 states. [2018-10-22 16:13:32,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:13:32,487 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-22 16:13:32,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-22 16:13:32,487 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 218 [2018-10-22 16:13:32,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:13:32,488 INFO L225 Difference]: With dead ends: 228 [2018-10-22 16:13:32,488 INFO L226 Difference]: Without dead ends: 223 [2018-10-22 16:13:32,489 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 942 GetRequests, 802 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-22 16:13:32,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-22 16:13:32,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-22 16:13:32,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-22 16:13:32,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-22 16:13:32,493 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-22 16:13:32,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:13:32,493 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-22 16:13:32,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-22 16:13:32,493 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-22 16:13:32,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-22 16:13:32,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:13:32,494 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:13:32,494 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:13:32,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:13:32,495 INFO L82 PathProgramCache]: Analyzing trace with hash 521920857, now seen corresponding path program 70 times [2018-10-22 16:13:32,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:13:32,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:32,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:13:32,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:13:32,496 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:13:32,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:13:34,297 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:34,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:34,297 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:13:34,297 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:13:34,297 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:13:34,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:13:34,297 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 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:34,304 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:13:34,305 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:13:34,338 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:13:34,338 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:13:34,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:13:34,395 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:13:34,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-22 16:13:34,440 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:13:34,641 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:13:34,641 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:13:34,646 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:13:34,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:13:34 BoogieIcfgContainer [2018-10-22 16:13:34,646 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:13:34,647 INFO L168 Benchmark]: Toolchain (without parser) took 235545.88 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 605.6 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -601.0 MB). Peak memory consumption was 4.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:34,648 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:34,649 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:34,649 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:34,649 INFO L168 Benchmark]: Boogie Preprocessor took 21.40 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:13:34,649 INFO L168 Benchmark]: RCFGBuilder took 291.63 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -802.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:34,650 INFO L168 Benchmark]: TraceAbstraction took 234936.66 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -146.3 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 191.0 MB). Peak memory consumption was 44.7 MB. Max. memory is 7.1 GB. [2018-10-22 16:13:34,652 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.40 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 291.63 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -802.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 234936.66 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -146.3 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 191.0 MB). Peak memory consumption was 44.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 222 with TraceHistMax 71,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 73 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 234.8s OverallTime, 72 OverallIterations, 71 TraceHistogramMax, 13.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 790 SDtfs, 2485 SDslu, 12837 SDs, 0 SdLazy, 6404 SolverSat, 131 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34505 GetRequests, 29536 SyntacticMatches, 0 SemanticMatches, 4969 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 190.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=222occurred in iteration=71, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 71 MinimizatonAttempts, 70 StatesRemovedByMinimization, 70 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.3s SsaConstructionTime, 13.4s SatisfiabilityAnalysisTime, 200.2s InterpolantComputationTime, 24033 NumberOfCodeBlocks, 24033 NumberOfCodeBlocksAsserted, 2681 NumberOfCheckSat, 39694 ConstructedInterpolants, 0 QuantifiedInterpolants, 16748246 SizeOfPredicates, 138 NumberOfNonLiveVariables, 22494 ConjunctsInSsa, 5106 ConjunctsInUnsatCore, 347 InterpolantComputations, 2 PerfectInterpolantSequences, 0/845250 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown