java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:02:09,369 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:02:09,372 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:02:09,387 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:02:09,387 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:02:09,389 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:02:09,390 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:02:09,392 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:02:09,395 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:02:09,396 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:02:09,396 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:02:09,397 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:02:09,398 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:02:09,399 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:02:09,400 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:02:09,403 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:02:09,404 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:02:09,413 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:02:09,418 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:02:09,422 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:02:09,424 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:02:09,425 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:02:09,430 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:02:09,431 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:02:09,431 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:02:09,432 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:02:09,433 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:02:09,436 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:02:09,437 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:02:09,438 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:02:09,438 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:02:09,439 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:02:09,443 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:02:09,472 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:02:09,472 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:02:09,474 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:02:09,474 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:02:09,475 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:02:09,478 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:02:09,478 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:02:09,478 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:02:09,478 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:02:09,478 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:02:09,479 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:02:09,479 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:02:09,480 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:02:09,480 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:02:09,480 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:02:09,480 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:02:09,480 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:02:09,481 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:02:09,481 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:02:09,481 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:02:09,481 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:02:09,481 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:02:09,482 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:02:09,482 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:02:09,482 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:02:09,482 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:02:09,482 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:02:09,483 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:02:09,483 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:02:09,483 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:02:09,483 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:02:09,483 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:02:09,484 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:02:09,484 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:02:09,535 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:02:09,548 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:02:09,551 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:02:09,553 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:02:09,553 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:02:09,555 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-22 16:02:09,624 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/41748a86d/22140d3fef5744b594d0094446d96f04/FLAG7ae4f5676 [2018-10-22 16:02:10,061 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:02:10,061 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-22 16:02:10,067 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/41748a86d/22140d3fef5744b594d0094446d96f04/FLAG7ae4f5676 [2018-10-22 16:02:10,086 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/41748a86d/22140d3fef5744b594d0094446d96f04 [2018-10-22 16:02:10,095 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:02:10,096 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:02:10,098 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:02:10,098 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:02:10,103 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:02:10,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,107 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b49186 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10, skipping insertion in model container [2018-10-22 16:02:10,107 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,117 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:02:10,141 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:02:10,365 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:02:10,369 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:02:10,389 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:02:10,412 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:02:10,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10 WrapperNode [2018-10-22 16:02:10,413 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:02:10,414 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:02:10,414 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:02:10,414 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:02:10,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,430 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,449 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:02:10,450 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:02:10,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:02:10,450 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:02:10,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,460 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,461 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,471 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... [2018-10-22 16:02:10,475 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:02:10,475 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:02:10,476 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:02:10,476 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:02:10,477 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:02:10,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:02:10,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:02:10,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:02:10,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:02:10,601 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:02:10,602 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:02:10,602 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:02:10,602 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:02:10,994 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:02:10,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:02:10 BoogieIcfgContainer [2018-10-22 16:02:10,995 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:02:10,996 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:02:10,996 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:02:10,999 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:02:11,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:02:10" (1/3) ... [2018-10-22 16:02:11,000 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fad72d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:02:11, skipping insertion in model container [2018-10-22 16:02:11,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:02:10" (2/3) ... [2018-10-22 16:02:11,001 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fad72d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:02:11, skipping insertion in model container [2018-10-22 16:02:11,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:02:10" (3/3) ... [2018-10-22 16:02:11,003 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-10-22 16:02:11,014 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:02:11,022 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:02:11,040 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:02:11,073 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:02:11,074 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:02:11,074 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:02:11,074 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:02:11,074 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:02:11,075 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:02:11,075 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:02:11,075 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:02:11,075 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:02:11,093 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-22 16:02:11,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-22 16:02:11,099 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:11,101 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:11,103 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:11,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:11,109 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-22 16:02:11,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:11,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:11,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,160 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:11,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:11,252 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:02:11,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:02:11,252 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:02:11,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:02:11,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:02:11,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:02:11,273 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-22 16:02:11,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:11,293 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-22 16:02:11,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:02:11,295 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-22 16:02:11,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:11,304 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:02:11,304 INFO L226 Difference]: Without dead ends: 15 [2018-10-22 16:02:11,308 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:02:11,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-22 16:02:11,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-22 16:02:11,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-22 16:02:11,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-22 16:02:11,358 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-22 16:02:11,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:11,358 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-22 16:02:11,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:02:11,359 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-22 16:02:11,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:02:11,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:11,360 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:11,360 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:11,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:11,363 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-22 16:02:11,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:11,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:11,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,366 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:11,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:11,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:11,516 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:02:11,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:02:11,516 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:02:11,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:02:11,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:02:11,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:02:11,521 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-22 16:02:11,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:11,604 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-22 16:02:11,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:02:11,606 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-22 16:02:11,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:11,607 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:02:11,608 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:02:11,610 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:02:11,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:02:11,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-22 16:02:11,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 16:02:11,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-22 16:02:11,619 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-22 16:02:11,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:11,619 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-22 16:02:11,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:02:11,621 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-22 16:02:11,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-22 16:02:11,622 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:11,622 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:11,622 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:11,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:11,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-22 16:02:11,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:11,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:11,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,625 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:11,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:11,747 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 16:02:11,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:11,748 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:11,749 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-22 16:02:11,753 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-22 16:02:11,814 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:02:11,814 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:02:12,661 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:02:12,663 INFO L272 AbstractInterpreter]: Visited 15 different actions 43 times. Merged at 3 different actions 21 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-22 16:02:12,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:12,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:02:12,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:12,695 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) [2018-10-22 16:02:12,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:12,714 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:12,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:12,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:12,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:12,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:12,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:12,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:12,985 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:13,005 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:13,005 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:13,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:13,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:13,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:13,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:13,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:13,143 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:13,143 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-10-22 16:02:13,143 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:13,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:02:13,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:02:13,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:02:13,150 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-22 16:02:13,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:13,300 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 16:02:13,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:02:13,302 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-22 16:02:13,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:13,302 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:02:13,303 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:02:13,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:02:13,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:02:13,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-22 16:02:13,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:02:13,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 16:02:13,312 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-22 16:02:13,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:13,312 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 16:02:13,312 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:02:13,312 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 16:02:13,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 16:02:13,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:13,313 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:13,314 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:13,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:13,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-22 16:02:13,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:13,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:13,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:13,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:13,316 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:13,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:13,441 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 16:02:13,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:13,441 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:13,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:13,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:13,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:13,442 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:13,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:13,460 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:13,502 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:13,503 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:13,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:13,527 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 16:02:13,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:13,645 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 16:02:13,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:13,672 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:13,687 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:13,688 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:13,778 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:13,778 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:13,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:13,793 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 16:02:13,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:13,864 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 16:02:13,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:13,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-10-22 16:02:13,870 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:13,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:02:13,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:02:13,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:02:13,871 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-22 16:02:13,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:13,929 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-22 16:02:13,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:02:13,933 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-22 16:02:13,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:13,934 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:02:13,934 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:02:13,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:02:13,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:02:13,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-22 16:02:13,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:02:13,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-22 16:02:13,940 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-22 16:02:13,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:13,941 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-22 16:02:13,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:02:13,941 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-22 16:02:13,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-22 16:02:13,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:13,942 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:13,942 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:13,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:13,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-22 16:02:13,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:13,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:13,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:13,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:13,944 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:14,067 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 16:02:14,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:14,067 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:14,068 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:14,068 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:14,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:14,068 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:14,088 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:14,088 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:14,151 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:02:14,151 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:14,153 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:14,168 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 16:02:14,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:14,486 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 16:02:14,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:14,519 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:14,548 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:14,548 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:14,695 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:02:14,696 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:14,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:14,707 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 16:02:14,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:14,725 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 16:02:14,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:14,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-10-22 16:02:14,731 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:14,732 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:02:14,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:02:14,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:02:14,733 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-22 16:02:14,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:14,793 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 16:02:14,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:02:14,794 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-22 16:02:14,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:14,796 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:02:14,796 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:02:14,796 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:02:14,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:02:14,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:02:14,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:02:14,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 16:02:14,801 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-22 16:02:14,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:14,802 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 16:02:14,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:02:14,802 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 16:02:14,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 16:02:14,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:14,803 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:14,803 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:14,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:14,804 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-22 16:02:14,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:14,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:14,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:14,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:14,805 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:14,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:15,040 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 16:02:15,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:15,040 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:15,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:15,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:15,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:15,042 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:15,059 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:15,059 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:15,100 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:15,100 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:15,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:15,186 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 16:02:15,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:15,315 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 16:02:15,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:15,336 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:15,353 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:15,353 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:15,423 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:15,423 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:15,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:15,435 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 16:02:15,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:15,485 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 16:02:15,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:15,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 13 [2018-10-22 16:02:15,488 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:15,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:02:15,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:02:15,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:02:15,490 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-22 16:02:15,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:15,750 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-22 16:02:15,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:02:15,751 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-22 16:02:15,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:15,752 INFO L225 Difference]: With dead ends: 36 [2018-10-22 16:02:15,752 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:02:15,752 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:02:15,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:02:15,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-22 16:02:15,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-22 16:02:15,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-22 16:02:15,757 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-22 16:02:15,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:15,758 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-22 16:02:15,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:02:15,758 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-22 16:02:15,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-22 16:02:15,759 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:15,759 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:15,760 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:15,760 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:15,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-22 16:02:15,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:15,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:15,761 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:15,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:15,761 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:15,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:15,938 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 16:02:15,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:15,939 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:15,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:15,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:15,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:15,939 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:15,947 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:15,947 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:15,996 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:02:15,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:15,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:16,019 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 16:02:16,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:16,192 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 16:02:16,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:16,213 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:16,229 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:16,229 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:16,370 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:02:16,370 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:16,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:16,382 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 16:02:16,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:16,408 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 16:02:16,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:16,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-10-22 16:02:16,410 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:16,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:02:16,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:02:16,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:02:16,411 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-22 16:02:16,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:16,482 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-22 16:02:16,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:02:16,482 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-22 16:02:16,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:16,483 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:02:16,483 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 16:02:16,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:02:16,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 16:02:16,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-22 16:02:16,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 16:02:16,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 16:02:16,489 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-22 16:02:16,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:16,489 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 16:02:16,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:02:16,489 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 16:02:16,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 16:02:16,490 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:16,490 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:16,491 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:16,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:16,491 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-22 16:02:16,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:16,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:16,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:16,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:16,493 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:16,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:16,624 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 16:02:16,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:16,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:16,625 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:16,625 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:16,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:16,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:16,633 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:16,633 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:16,677 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:02:16,677 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:16,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:16,699 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 16:02:16,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:16,894 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 16:02:16,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:16,915 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:16,932 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:16,932 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:17,248 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:02:17,248 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:17,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:17,262 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 16:02:17,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:17,286 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 16:02:17,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:17,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-10-22 16:02:17,288 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:17,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:02:17,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:02:17,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:02:17,290 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-22 16:02:17,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:17,368 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-22 16:02:17,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:02:17,370 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-22 16:02:17,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:17,372 INFO L225 Difference]: With dead ends: 42 [2018-10-22 16:02:17,372 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 16:02:17,373 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:02:17,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 16:02:17,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-22 16:02:17,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-22 16:02:17,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-22 16:02:17,378 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-22 16:02:17,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:17,379 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-22 16:02:17,381 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:02:17,381 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-22 16:02:17,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-22 16:02:17,383 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:17,383 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:17,383 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:17,384 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:17,384 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-22 16:02:17,384 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:17,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:17,385 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:17,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:17,385 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:17,523 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 16:02:17,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:17,523 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:17,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:17,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:17,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:17,524 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:17,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:17,533 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:17,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:17,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:17,624 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 16:02:17,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:17,784 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 16:02:17,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:17,806 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 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:17,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:17,822 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:17,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:17,908 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:17,915 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 16:02:17,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:17,964 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 16:02:17,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:17,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-10-22 16:02:17,966 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:17,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:02:17,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:02:17,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:02:17,967 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-22 16:02:18,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:18,028 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-22 16:02:18,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:02:18,030 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-22 16:02:18,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:18,031 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:02:18,031 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:02:18,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:02:18,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:02:18,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-22 16:02:18,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 16:02:18,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 16:02:18,036 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-22 16:02:18,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:18,037 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 16:02:18,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:02:18,037 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 16:02:18,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 16:02:18,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:18,038 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:18,038 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:18,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:18,038 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-22 16:02:18,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:18,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:18,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:18,040 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:18,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:18,162 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 16:02:18,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:18,162 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:18,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:18,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:18,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:18,163 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:18,171 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:18,171 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:18,222 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:18,222 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:18,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:18,243 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 16:02:18,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:18,605 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 16:02:18,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:18,626 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:18,645 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:18,645 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:18,757 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:18,758 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:18,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:18,771 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 16:02:18,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:18,797 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 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 (17)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 16:02:18,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:18,801 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 21 [2018-10-22 16:02:18,801 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:18,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:02:18,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:02:18,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:02:18,802 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-22 16:02:18,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:18,992 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-22 16:02:18,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:02:18,993 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-22 16:02:18,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:18,995 INFO L225 Difference]: With dead ends: 48 [2018-10-22 16:02:18,995 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:02:18,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:02:18,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:02:19,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-22 16:02:19,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-22 16:02:19,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-22 16:02:19,001 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-22 16:02:19,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:19,001 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-22 16:02:19,001 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:02:19,002 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-22 16:02:19,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-22 16:02:19,003 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:19,003 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:19,003 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:19,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:19,003 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-22 16:02:19,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:19,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:19,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:19,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:19,004 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:19,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:19,353 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 16:02:19,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:19,353 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:19,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:19,354 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:19,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:19,354 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:19,364 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:19,365 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:19,546 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:02:19,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:19,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:19,579 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 16:02:19,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:19,747 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 16:02:19,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:19,769 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:19,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:19,784 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:20,362 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:02:20,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:20,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:20,374 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 16:02:20,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:20,423 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 16:02:20,426 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:20,426 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 23 [2018-10-22 16:02:20,426 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:20,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:02:20,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:02:20,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:02:20,427 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-22 16:02:20,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:20,533 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-22 16:02:20,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:02:20,534 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-22 16:02:20,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:20,535 INFO L225 Difference]: With dead ends: 51 [2018-10-22 16:02:20,536 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:02:20,537 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:02:20,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:02:20,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-22 16:02:20,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-22 16:02:20,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-22 16:02:20,542 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-22 16:02:20,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:20,542 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-22 16:02:20,542 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:02:20,542 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-22 16:02:20,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 16:02:20,543 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:20,543 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:20,544 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:20,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:20,544 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-22 16:02:20,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:20,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:20,545 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:20,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:20,545 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:20,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:20,677 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 16:02:20,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:20,677 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:20,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:20,677 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:20,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:20,678 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:20,688 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:20,688 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:20,735 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:20,735 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:20,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:20,761 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 16:02:20,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:21,122 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 16:02:21,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:21,144 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:21,161 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:21,162 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:21,270 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:21,271 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:21,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:21,283 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 16:02:21,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:21,334 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 16:02:21,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:21,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 25 [2018-10-22 16:02:21,338 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:21,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:02:21,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:02:21,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:02:21,339 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-22 16:02:21,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:21,462 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-22 16:02:21,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:02:21,466 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-22 16:02:21,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:21,467 INFO L225 Difference]: With dead ends: 54 [2018-10-22 16:02:21,467 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 16:02:21,468 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:02:21,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 16:02:21,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-22 16:02:21,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-22 16:02:21,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-22 16:02:21,473 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-22 16:02:21,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:21,473 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-22 16:02:21,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:02:21,474 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-22 16:02:21,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-22 16:02:21,474 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:21,474 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:21,475 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:21,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:21,475 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-22 16:02:21,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:21,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:21,476 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:21,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:21,476 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:21,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:21,744 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 16:02:21,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:21,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:21,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:21,745 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:21,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:21,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:21,753 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:21,753 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:21,868 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:02:21,868 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:21,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:21,924 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 16:02:21,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:22,192 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 16:02:22,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:22,213 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:22,228 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:22,228 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:22,961 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:02:22,962 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:22,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:22,975 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 16:02:22,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:23,003 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 16:02:23,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:23,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 27 [2018-10-22 16:02:23,005 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:23,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:02:23,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:02:23,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:02:23,007 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-22 16:02:23,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:23,093 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-22 16:02:23,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:02:23,094 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-22 16:02:23,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:23,095 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:02:23,096 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 16:02:23,097 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:02:23,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 16:02:23,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-22 16:02:23,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 16:02:23,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-22 16:02:23,102 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-22 16:02:23,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:23,102 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-22 16:02:23,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:02:23,103 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-22 16:02:23,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-22 16:02:23,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:23,104 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:23,104 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:23,104 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:23,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-22 16:02:23,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:23,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:23,105 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:23,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:23,106 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:23,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:23,883 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 16:02:23,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:23,884 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:23,884 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:23,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:23,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:23,884 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:23,893 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:23,893 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:24,156 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:02:24,156 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:24,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:24,173 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 16:02:24,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:24,502 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 16:02:24,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:24,523 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:24,538 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:24,538 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:25,557 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:02:25,558 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:25,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:25,574 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 16:02:25,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:25,621 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 16:02:25,623 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:25,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 29 [2018-10-22 16:02:25,623 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:25,624 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:02:25,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:02:25,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:02:25,625 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-22 16:02:25,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:25,710 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-22 16:02:25,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:02:25,711 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-22 16:02:25,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:25,712 INFO L225 Difference]: With dead ends: 60 [2018-10-22 16:02:25,712 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 16:02:25,713 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:02:25,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 16:02:25,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-22 16:02:25,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-22 16:02:25,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-22 16:02:25,718 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-22 16:02:25,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:25,718 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-22 16:02:25,719 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:02:25,719 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-22 16:02:25,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-22 16:02:25,720 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:25,720 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:25,720 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:25,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:25,721 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-22 16:02:25,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:25,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:25,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:25,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:25,722 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:25,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:26,014 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 16:02:26,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,015 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:26,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:26,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:26,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,015 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:26,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:26,024 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:26,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:26,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,214 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 16:02:26,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,630 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 16:02:26,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,660 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:26,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:26,677 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:26,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,812 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 16:02:26,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,861 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 16:02:26,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:26,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 31 [2018-10-22 16:02:26,862 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:26,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:02:26,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:02:26,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:02:26,864 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-22 16:02:26,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:26,976 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-22 16:02:26,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:02:26,977 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-22 16:02:26,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:26,978 INFO L225 Difference]: With dead ends: 63 [2018-10-22 16:02:26,978 INFO L226 Difference]: Without dead ends: 57 [2018-10-22 16:02:26,979 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:02:26,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-22 16:02:26,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-22 16:02:26,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-22 16:02:26,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-22 16:02:26,984 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-22 16:02:26,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:26,984 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-22 16:02:26,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:02:26,985 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-22 16:02:26,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-22 16:02:26,985 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:26,985 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:26,986 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:26,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:26,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-22 16:02:26,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:26,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:26,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:26,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:26,987 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:26,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:27,286 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 16:02:27,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,286 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:27,287 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:27,287 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:27,287 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,287 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:27,298 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:27,298 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:27,359 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:27,360 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:27,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:27,383 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 16:02:27,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:27,707 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 16:02:27,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,728 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:27,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:27,743 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:27,893 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:27,893 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:27,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:27,906 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 16:02:27,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:27,939 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 16:02:27,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:27,942 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 33 [2018-10-22 16:02:27,942 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:27,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:02:27,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:02:27,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:02:27,944 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-22 16:02:28,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:28,027 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-22 16:02:28,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:02:28,027 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-22 16:02:28,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:28,028 INFO L225 Difference]: With dead ends: 66 [2018-10-22 16:02:28,028 INFO L226 Difference]: Without dead ends: 60 [2018-10-22 16:02:28,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:02:28,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-22 16:02:28,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-22 16:02:28,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-22 16:02:28,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-22 16:02:28,035 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-22 16:02:28,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:28,035 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-22 16:02:28,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:02:28,036 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-22 16:02:28,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-22 16:02:28,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:28,036 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:28,037 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:28,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:28,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-22 16:02:28,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:28,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:28,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,038 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:28,424 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 16:02:28,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,425 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:28,425 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:28,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:28,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,425 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:28,432 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:28,432 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:28,863 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:28,864 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:28,867 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:28,882 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 16:02:28,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:29,700 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 16:02:29,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,721 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:29,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:29,736 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:31,479 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:31,480 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:31,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:31,495 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 16:02:31,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:31,543 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 16:02:31,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:31,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 35 [2018-10-22 16:02:31,545 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:31,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:02:31,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:02:31,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:02:31,546 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-22 16:02:31,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:31,619 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-22 16:02:31,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:02:31,626 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-22 16:02:31,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:31,627 INFO L225 Difference]: With dead ends: 69 [2018-10-22 16:02:31,627 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 16:02:31,628 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:02:31,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 16:02:31,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-22 16:02:31,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-22 16:02:31,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-22 16:02:31,632 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-22 16:02:31,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:31,633 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-22 16:02:31,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:02:31,633 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-22 16:02:31,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-22 16:02:31,634 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:31,634 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:31,634 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:31,634 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:31,634 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-22 16:02:31,634 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:31,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:31,635 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:31,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:31,635 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:31,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:31,948 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 16:02:31,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:31,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:31,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:31,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:31,949 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:31,956 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:31,956 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:32,023 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:32,023 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:32,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:32,040 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 16:02:32,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:32,876 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 16:02:32,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:32,897 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:32,911 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:32,912 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:33,051 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:33,051 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:33,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:33,070 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 16:02:33,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:33,110 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 16:02:33,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:33,112 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 37 [2018-10-22 16:02:33,112 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:33,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:02:33,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:02:33,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:02:33,113 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-22 16:02:33,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:33,232 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-22 16:02:33,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:02:33,233 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-22 16:02:33,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:33,234 INFO L225 Difference]: With dead ends: 72 [2018-10-22 16:02:33,234 INFO L226 Difference]: Without dead ends: 66 [2018-10-22 16:02:33,235 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 226 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:02:33,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-22 16:02:33,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-22 16:02:33,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-22 16:02:33,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-22 16:02:33,241 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-22 16:02:33,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:33,241 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-22 16:02:33,241 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:02:33,242 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-22 16:02:33,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-22 16:02:33,242 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:33,243 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:33,243 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:33,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:33,243 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-22 16:02:33,243 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:33,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:33,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:33,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:33,244 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:33,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:33,861 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 16:02:33,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:33,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:33,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:33,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:33,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:33,862 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:33,869 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:33,869 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:34,093 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:02:34,093 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:34,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:34,127 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 16:02:34,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:34,750 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 16:02:34,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:34,772 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:34,802 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:34,803 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:38,827 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:02:38,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:38,837 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:38,846 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 16:02:38,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:38,906 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 16:02:38,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:38,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 39 [2018-10-22 16:02:38,909 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:38,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:02:38,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:02:38,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:02:38,911 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-22 16:02:39,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:39,368 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-22 16:02:39,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:02:39,368 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-22 16:02:39,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:39,369 INFO L225 Difference]: With dead ends: 75 [2018-10-22 16:02:39,369 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:02:39,371 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:02:39,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:02:39,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-22 16:02:39,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-22 16:02:39,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-22 16:02:39,375 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-22 16:02:39,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:39,375 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-22 16:02:39,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:02:39,376 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-22 16:02:39,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-22 16:02:39,376 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:39,377 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:39,377 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:39,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:39,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-22 16:02:39,377 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:39,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:39,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:39,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:39,378 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:39,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:39,631 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 16:02:39,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:39,631 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:39,631 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:39,632 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:39,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:39,632 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:02:39,639 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:39,639 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:40,394 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:02:40,394 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:40,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:40,429 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 16:02:40,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:41,301 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 16:02:41,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:41,323 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 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:02:41,339 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:41,339 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:44,465 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-10-22 16:02:44,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:44,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:44,484 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 16:02:44,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:44,543 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 16:02:44,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:44,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 41 [2018-10-22 16:02:44,547 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:44,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:02:44,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:02:44,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:02:44,549 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-22 16:02:44,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:44,703 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-22 16:02:44,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:02:44,705 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-22 16:02:44,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:44,706 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:02:44,706 INFO L226 Difference]: Without dead ends: 72 [2018-10-22 16:02:44,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:02:44,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-22 16:02:44,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-22 16:02:44,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-22 16:02:44,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-22 16:02:44,712 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-22 16:02:44,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:44,712 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-22 16:02:44,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:02:44,712 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-22 16:02:44,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-22 16:02:44,713 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:44,713 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:44,713 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:44,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:44,713 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-22 16:02:44,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:44,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:44,714 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:44,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:44,714 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:44,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:45,048 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 16:02:45,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:45,048 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:45,048 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:45,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:45,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:45,049 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 16:02:45,056 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:45,056 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:45,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:45,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:45,146 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 16:02:45,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:45,647 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 16:02:45,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:45,668 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 16:02:45,683 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:45,683 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:45,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:45,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:45,860 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 16:02:45,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:45,871 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 16:02:45,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:45,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 43 [2018-10-22 16:02:45,873 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:45,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:02:45,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:02:45,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:02:45,875 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-22 16:02:45,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:45,995 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-22 16:02:45,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:02:45,995 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-22 16:02:45,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:45,997 INFO L225 Difference]: With dead ends: 81 [2018-10-22 16:02:45,997 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:02:45,998 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:02:45,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:02:46,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-22 16:02:46,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-22 16:02:46,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-22 16:02:46,002 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-22 16:02:46,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:46,002 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-22 16:02:46,002 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:02:46,002 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-22 16:02:46,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-22 16:02:46,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:46,007 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:46,007 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:46,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:46,008 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-22 16:02:46,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:46,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:46,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:46,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:46,009 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:46,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:47,528 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 16:02:47,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:47,528 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:47,529 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:47,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:47,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:47,529 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 16:02:47,537 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:47,538 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:47,618 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:47,619 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:47,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:47,721 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 16:02:47,722 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:48,859 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 16:02:48,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:48,879 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 16:02:48,894 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:48,894 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:49,097 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:49,097 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:49,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:49,114 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 16:02:49,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:49,128 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 16:02:49,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:49,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 45 [2018-10-22 16:02:49,130 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:49,130 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:02:49,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:02:49,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:02:49,131 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-22 16:02:49,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:49,257 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-22 16:02:49,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:02:49,258 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-22 16:02:49,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:49,259 INFO L225 Difference]: With dead ends: 84 [2018-10-22 16:02:49,259 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 16:02:49,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:02:49,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 16:02:49,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-22 16:02:49,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-22 16:02:49,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-22 16:02:49,265 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-22 16:02:49,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:49,265 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-22 16:02:49,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:02:49,265 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-22 16:02:49,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-22 16:02:49,266 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:49,266 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:49,266 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:49,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:49,267 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-22 16:02:49,267 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:49,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:49,268 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:49,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:49,268 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:49,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:49,660 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 16:02:49,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:49,661 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:49,661 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:49,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:49,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:49,661 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 16:02:49,669 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:49,669 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:50,813 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:02:50,813 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:50,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:50,845 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 16:02:50,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:51,378 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 16:02:51,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:51,400 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 16:02:51,416 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:51,416 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:56,266 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-22 16:02:56,266 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:56,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:56,284 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 16:02:56,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:56,311 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 16:02:56,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:56,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 47 [2018-10-22 16:02:56,314 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:56,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:02:56,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:02:56,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:02:56,315 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-22 16:02:56,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:56,444 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-22 16:02:56,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:02:56,445 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-22 16:02:56,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:56,446 INFO L225 Difference]: With dead ends: 87 [2018-10-22 16:02:56,446 INFO L226 Difference]: Without dead ends: 81 [2018-10-22 16:02:56,447 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:02:56,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-22 16:02:56,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-22 16:02:56,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-22 16:02:56,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-22 16:02:56,450 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-22 16:02:56,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:56,450 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-22 16:02:56,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:02:56,450 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-22 16:02:56,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-22 16:02:56,451 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:56,451 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:56,451 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:56,451 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:56,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-22 16:02:56,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:56,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:56,452 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:56,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:56,452 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:57,040 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 16:02:57,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:57,041 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:57,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:57,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:57,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:57,041 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 16:02:57,050 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:57,050 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:57,134 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:57,134 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:57,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:57,246 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 16:02:57,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:57,950 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 16:02:57,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:57,972 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 16:02:57,990 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:57,990 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:58,194 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:58,195 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:58,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:58,222 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 16:02:58,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:58,290 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 16:02:58,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:58,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 49 [2018-10-22 16:02:58,293 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:58,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:02:58,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:02:58,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 16:02:58,295 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-22 16:02:58,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:58,415 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-22 16:02:58,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:02:58,415 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-22 16:02:58,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:58,416 INFO L225 Difference]: With dead ends: 90 [2018-10-22 16:02:58,416 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 16:02:58,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 16:02:58,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 16:02:58,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-22 16:02:58,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-22 16:02:58,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-22 16:02:58,421 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-22 16:02:58,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:58,421 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-22 16:02:58,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:02:58,422 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-22 16:02:58,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-22 16:02:58,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:58,422 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:58,422 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:58,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:58,423 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-22 16:02:58,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:58,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:58,423 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:58,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:58,423 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:58,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:58,832 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 16:02:58,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:58,832 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:58,832 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:58,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:58,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:58,833 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 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 16:02:58,839 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:58,839 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:59,444 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:02:59,444 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:59,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:59,465 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 16:02:59,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:00,264 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 16:03:00,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:00,286 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:00,301 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:00,301 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:27,106 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 16:03:27,106 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:27,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:27,143 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 16:03:27,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:27,205 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 16:03:27,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:27,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 51 [2018-10-22 16:03:27,208 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:27,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:03:27,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:03:27,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:03:27,209 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-22 16:03:27,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:27,328 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-22 16:03:27,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:03:27,329 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-22 16:03:27,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:27,330 INFO L225 Difference]: With dead ends: 93 [2018-10-22 16:03:27,330 INFO L226 Difference]: Without dead ends: 87 [2018-10-22 16:03:27,332 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:03:27,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-22 16:03:27,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-22 16:03:27,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-22 16:03:27,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-22 16:03:27,335 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-22 16:03:27,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:27,336 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-22 16:03:27,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:03:27,336 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-22 16:03:27,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-22 16:03:27,336 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:27,337 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:27,337 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:27,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:27,337 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-22 16:03:27,337 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:27,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:27,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:27,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:27,338 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:27,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:28,707 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 16:03:28,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:28,707 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:28,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:28,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:28,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:28,707 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:28,715 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:28,715 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:34,038 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:03:34,039 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:34,048 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:34,085 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 16:03:34,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:34,824 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 16:03:34,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:34,846 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:34,860 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:34,861 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:55,262 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-10-22 16:03:55,262 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:55,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:55,293 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 16:03:55,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:55,357 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 16:03:55,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:55,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 53 [2018-10-22 16:03:55,361 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:55,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:03:55,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:03:55,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:03:55,364 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-22 16:03:55,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:55,513 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-22 16:03:55,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:03:55,514 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-22 16:03:55,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:55,515 INFO L225 Difference]: With dead ends: 96 [2018-10-22 16:03:55,515 INFO L226 Difference]: Without dead ends: 90 [2018-10-22 16:03:55,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:03:55,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-22 16:03:55,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-22 16:03:55,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-22 16:03:55,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-22 16:03:55,521 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-22 16:03:55,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:55,521 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-22 16:03:55,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:03:55,521 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-22 16:03:55,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-22 16:03:55,522 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:55,522 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:55,522 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:55,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:55,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-22 16:03:55,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:55,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:55,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:55,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:55,524 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:55,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:56,348 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 16:03:56,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:56,348 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:56,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:56,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:56,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:56,349 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 16:03:56,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:56,359 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:56,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:56,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:56,533 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 16:03:56,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:57,353 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 16:03:57,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:57,386 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 16:03:57,413 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:57,413 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:57,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:57,626 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 16:03:57,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:57,644 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 16:03:57,646 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:57,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 55 [2018-10-22 16:03:57,646 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:57,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:03:57,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:03:57,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:57,648 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-22 16:03:57,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:57,777 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-22 16:03:57,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:03:57,778 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-22 16:03:57,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:57,779 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:03:57,779 INFO L226 Difference]: Without dead ends: 93 [2018-10-22 16:03:57,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:57,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-22 16:03:57,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-22 16:03:57,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-22 16:03:57,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-22 16:03:57,785 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-22 16:03:57,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:57,785 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-22 16:03:57,785 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:03:57,785 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-22 16:03:57,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-22 16:03:57,786 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:57,786 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:57,786 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:57,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:57,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-22 16:03:57,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:57,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:57,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:57,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:57,787 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:57,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:58,232 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 16:03:58,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:58,233 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:58,233 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:58,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:58,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:58,233 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 16:03:58,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:58,242 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:58,348 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:58,349 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:58,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:58,379 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 16:03:58,379 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:59,217 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 16:03:59,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:59,238 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 16:03:59,254 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:59,254 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:59,505 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:59,505 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:59,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:59,528 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 16:03:59,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:59,588 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 16:03:59,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:59,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 57 [2018-10-22 16:03:59,591 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:59,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:03:59,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:03:59,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:03:59,593 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-22 16:03:59,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:59,793 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-22 16:03:59,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:03:59,794 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-22 16:03:59,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:59,795 INFO L225 Difference]: With dead ends: 102 [2018-10-22 16:03:59,795 INFO L226 Difference]: Without dead ends: 96 [2018-10-22 16:03:59,797 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:03:59,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-22 16:03:59,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-22 16:03:59,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-22 16:03:59,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-22 16:03:59,801 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-22 16:03:59,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:59,801 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-22 16:03:59,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:03:59,801 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-22 16:03:59,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-22 16:03:59,802 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:59,802 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:59,802 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:59,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:59,802 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-22 16:03:59,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:59,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:59,803 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:59,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:59,803 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:59,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:00,429 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 16:04:00,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:00,429 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:00,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:00,430 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:00,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:00,430 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 16:04:00,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:00,437 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:19,171 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:04:19,171 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:19,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:19,213 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 16:04:19,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:20,156 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 16:04:20,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:20,181 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 16:04:20,196 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:04:20,196 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:04:32,595 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-22 16:04:32,596 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:32,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:32,624 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 16:04:32,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:32,667 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 16:04:32,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:32,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 59 [2018-10-22 16:04:32,670 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:32,670 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:04:32,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:04:32,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:04:32,672 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-22 16:04:32,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:32,789 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-22 16:04:32,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:04:32,790 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-22 16:04:32,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:32,791 INFO L225 Difference]: With dead ends: 105 [2018-10-22 16:04:32,791 INFO L226 Difference]: Without dead ends: 99 [2018-10-22 16:04:32,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:04:32,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-22 16:04:32,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-22 16:04:32,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-22 16:04:32,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-22 16:04:32,795 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-22 16:04:32,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:32,795 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-22 16:04:32,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:04:32,795 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-22 16:04:32,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-22 16:04:32,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:32,796 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:32,796 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:32,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:32,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-22 16:04:32,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:32,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:32,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:32,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:32,798 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:32,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:33,702 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 16:04:33,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:33,702 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:33,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:33,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:33,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:33,703 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 16:04:33,710 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:33,710 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:33,820 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:33,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:33,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:33,854 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 16:04:33,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:35,786 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 16:04:35,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:35,817 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 16:04:35,844 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:04:35,845 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:04:36,080 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:04:36,081 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:36,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:36,101 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 16:04:36,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:36,116 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 16:04:36,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:36,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 61 [2018-10-22 16:04:36,119 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:36,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:04:36,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:04:36,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 16:04:36,120 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-22 16:04:36,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:36,268 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-22 16:04:36,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:04:36,269 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-22 16:04:36,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:36,270 INFO L225 Difference]: With dead ends: 108 [2018-10-22 16:04:36,270 INFO L226 Difference]: Without dead ends: 102 [2018-10-22 16:04:36,271 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 16:04:36,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-22 16:04:36,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-22 16:04:36,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-22 16:04:36,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-22 16:04:36,274 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-22 16:04:36,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:36,274 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-22 16:04:36,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:04:36,275 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-22 16:04:36,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-22 16:04:36,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:36,275 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:36,276 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:36,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:36,276 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-22 16:04:36,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:36,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:36,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:36,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:36,277 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:36,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:37,753 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 16:04:37,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:37,754 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:37,754 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:37,754 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:37,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:37,754 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 16:04:37,763 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:37,764 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:38,508 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:04:38,508 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:38,513 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:38,528 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 16:04:38,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:39,532 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 16:04:39,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:39,555 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 16:04:39,569 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:04:39,570 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:16,699 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 16:06:16,700 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:16,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:16,749 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 16:06:16,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:16,825 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 16:06:16,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:16,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 63 [2018-10-22 16:06:16,830 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:16,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:06:16,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:06:16,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:06:16,831 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-22 16:06:17,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:17,109 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-22 16:06:17,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:06:17,109 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-22 16:06:17,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:17,110 INFO L225 Difference]: With dead ends: 111 [2018-10-22 16:06:17,110 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:06:17,111 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:06:17,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:06:17,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-22 16:06:17,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-22 16:06:17,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-22 16:06:17,115 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-22 16:06:17,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:17,115 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-22 16:06:17,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:06:17,115 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-22 16:06:17,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-22 16:06:17,116 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:17,116 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:17,116 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:17,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:17,117 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-22 16:06:17,117 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:17,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:17,117 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:17,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:17,118 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:17,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:17,660 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 16:06:17,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:17,660 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:17,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:17,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:17,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:17,661 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 16:06:17,668 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:06:17,668 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown