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/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:31,711 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:31,713 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:31,726 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:31,726 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:31,727 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:31,728 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:31,730 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:31,732 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:31,733 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:31,734 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:31,734 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:31,735 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:31,736 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:31,738 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:31,738 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:31,739 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:31,743 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:31,748 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:31,753 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:31,754 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:31,755 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:31,763 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:00:31,777 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:00:31,792 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:31,792 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:31,793 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:31,793 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:31,793 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:31,794 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:31,794 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:31,794 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:31,794 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:31,794 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:31,795 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:31,795 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:31,795 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:31,796 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:31,796 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:31,796 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:31,796 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:31,797 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:31,797 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:31,797 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:31,797 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:31,797 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:31,798 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:31,798 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:31,798 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:31,798 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:31,798 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:31,799 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:31,799 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:31,799 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:31,799 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:31,799 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:31,800 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:31,800 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:31,858 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:31,877 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:31,882 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:31,884 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:31,884 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:31,885 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-22 16:00:31,946 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ba81f5884/c05ed6c8f9f445fd85646a03dace3cf6/FLAG62f63df8a [2018-10-22 16:00:32,467 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:32,468 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-22 16:00:32,474 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ba81f5884/c05ed6c8f9f445fd85646a03dace3cf6/FLAG62f63df8a [2018-10-22 16:00:32,487 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ba81f5884/c05ed6c8f9f445fd85646a03dace3cf6 [2018-10-22 16:00:32,498 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:32,500 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:32,501 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:32,501 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:32,505 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:32,506 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,510 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16d25b82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32, skipping insertion in model container [2018-10-22 16:00:32,510 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,521 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:32,540 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:32,706 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:32,710 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:32,727 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:32,741 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:32,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32 WrapperNode [2018-10-22 16:00:32,741 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:32,742 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:32,742 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:32,743 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:32,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,756 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,762 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:32,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:32,762 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:32,763 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:32,770 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,771 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,771 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,772 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,775 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,780 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,781 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... [2018-10-22 16:00:32,783 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:32,783 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:32,783 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:32,784 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:32,784 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:32,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:32,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:32,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:32,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:32,917 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:32,919 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:32,920 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:32,920 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:33,138 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:33,138 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:33 BoogieIcfgContainer [2018-10-22 16:00:33,139 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:33,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:33,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:33,144 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:33,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:32" (1/3) ... [2018-10-22 16:00:33,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40f86f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:33, skipping insertion in model container [2018-10-22 16:00:33,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:32" (2/3) ... [2018-10-22 16:00:33,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40f86f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:33, skipping insertion in model container [2018-10-22 16:00:33,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:33" (3/3) ... [2018-10-22 16:00:33,147 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-22 16:00:33,158 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:33,166 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:33,183 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:33,213 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:33,214 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:33,214 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:33,214 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:33,214 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:33,215 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:33,215 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:33,215 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:33,215 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:33,233 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-22 16:00:33,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:00:33,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:33,240 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:33,243 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:33,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-22 16:00:33,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:33,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,306 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,306 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:33,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:33,361 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:33,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:33,361 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:33,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:33,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:33,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:33,385 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-22 16:00:33,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:33,408 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:00:33,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:33,410 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:00:33,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:33,418 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:00:33,419 INFO L226 Difference]: Without dead ends: 13 [2018-10-22 16:00:33,422 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:33,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-22 16:00:33,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-22 16:00:33,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-22 16:00:33,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-22 16:00:33,463 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-22 16:00:33,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:33,464 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-22 16:00:33,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:33,464 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-22 16:00:33,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:00:33,465 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:33,465 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:33,466 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:33,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-22 16:00:33,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:33,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,468 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:33,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:33,716 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:33,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:33,717 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:33,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:33,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:33,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:33,720 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-22 16:00:33,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:33,865 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-22 16:00:33,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:33,866 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:00:33,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:33,867 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:00:33,867 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:00:33,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:33,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:00:33,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:00:33,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:00:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-22 16:00:33,877 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-22 16:00:33,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:33,877 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-22 16:00:33,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-22 16:00:33,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:00:33,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:33,879 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:33,880 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:33,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,881 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-22 16:00:33,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:33,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,883 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:33,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,014 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 16:00:34,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,015 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:34,016 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-22 16:00:34,017 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:00:34,065 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:34,066 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:34,180 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:34,561 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:34,566 INFO L272 AbstractInterpreter]: Visited 13 different actions 93 times. Merged at 4 different actions 42 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-22 16:00:34,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:34,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:34,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,617 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:34,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:34,637 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:34,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,792 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 16:00:34,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,082 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 16:00:35,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,123 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:35,152 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:35,152 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:35,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:35,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,265 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 16:00:35,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,324 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 16:00:35,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:35,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:00:35,328 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:35,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:00:35,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:00:35,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:35,330 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-22 16:00:35,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:35,474 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-22 16:00:35,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:00:35,475 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-22 16:00:35,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:35,476 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:00:35,476 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:00:35,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:35,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:00:35,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:00:35,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:00:35,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-22 16:00:35,482 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-22 16:00:35,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:35,482 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-22 16:00:35,482 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:00:35,483 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-22 16:00:35,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:35,483 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:35,484 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:35,484 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:35,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:35,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-22 16:00:35,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:35,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,486 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:35,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,486 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:35,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:35,762 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 16:00:35,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,762 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:35,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:35,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:35,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,763 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:35,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:35,785 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,830 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:35,830 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,901 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 16:00:35,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,044 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 16:00:36,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,076 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:36,092 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:36,092 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:36,116 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:36,116 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,162 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 16:00:36,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,189 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 16:00:36,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:36,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:00:36,193 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:36,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:00:36,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:00:36,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:36,194 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-22 16:00:36,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:36,271 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-22 16:00:36,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:00:36,274 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-22 16:00:36,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:36,275 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:00:36,276 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:00:36,276 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:36,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:00:36,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:00:36,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:00:36,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-22 16:00:36,281 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2018-10-22 16:00:36,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:36,282 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-22 16:00:36,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:00:36,282 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-22 16:00:36,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-22 16:00:36,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:36,283 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:36,284 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:36,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:36,284 INFO L82 PathProgramCache]: Analyzing trace with hash 26004059, now seen corresponding path program 3 times [2018-10-22 16:00:36,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:36,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:36,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,286 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:36,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,515 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 16:00:36,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,515 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,515 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:36,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:36,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,516 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:36,528 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:36,529 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:36,537 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-22 16:00:36,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,556 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:36,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,603 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-22 16:00:36,624 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:00:36,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2018-10-22 16:00:36,625 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:36,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:36,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:36,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:36,627 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 3 states. [2018-10-22 16:00:36,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:36,658 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-22 16:00:36,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:36,658 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2018-10-22 16:00:36,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:36,659 INFO L225 Difference]: With dead ends: 30 [2018-10-22 16:00:36,659 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:00:36,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:36,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:00:36,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-22 16:00:36,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:00:36,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-22 16:00:36,666 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-22 16:00:36,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:36,666 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-22 16:00:36,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:36,666 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-22 16:00:36,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:00:36,667 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:36,667 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:36,668 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:36,668 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:36,668 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 1 times [2018-10-22 16:00:36,668 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:36,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:36,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,669 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:36,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,909 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 16:00:36,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,909 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,909 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-10-22 16:00:36,910 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-22 16:00:36,911 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:36,912 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:36,917 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:37,205 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:37,205 INFO L272 AbstractInterpreter]: Visited 14 different actions 114 times. Merged at 5 different actions 46 times. Widened at 2 different actions 7 times. Found 12 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-22 16:00:37,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:37,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:37,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,242 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:37,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:37,262 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:37,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:37,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:37,475 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:37,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,462 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:38,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,496 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 8 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 8 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:38,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:38,526 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:38,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:38,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,572 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:38,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,695 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:38,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:38,698 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7, 6, 6] total 15 [2018-10-22 16:00:38,698 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:38,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:38,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:38,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=133, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:38,700 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 7 states. [2018-10-22 16:00:38,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:38,839 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2018-10-22 16:00:38,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:38,839 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-22 16:00:38,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:38,840 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:00:38,841 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:00:38,841 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=77, Invalid=133, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:38,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:00:38,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-22 16:00:38,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-22 16:00:38,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-22 16:00:38,846 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2018-10-22 16:00:38,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:38,847 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-22 16:00:38,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:38,847 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-22 16:00:38,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-22 16:00:38,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:38,848 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:38,849 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:38,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:38,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1956763133, now seen corresponding path program 2 times [2018-10-22 16:00:38,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:38,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:38,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:38,851 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:38,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,027 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 16:00:39,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,028 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:39,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:39,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:39,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,029 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:39,039 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:39,039 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:39,059 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:39,059 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:39,091 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 16:00:39,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:39,319 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 16:00:39,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,340 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 10 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 10 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:39,357 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:39,357 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:39,383 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:39,383 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:39,417 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 16:00:39,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:39,440 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 16:00:39,442 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:39,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:00:39,442 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:39,443 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:39,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:39,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:39,444 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2018-10-22 16:00:39,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,603 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2018-10-22 16:00:39,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:00:39,604 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-22 16:00:39,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,606 INFO L225 Difference]: With dead ends: 40 [2018-10-22 16:00:39,606 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:00:39,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:39,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:00:39,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 16:00:39,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:00:39,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-22 16:00:39,612 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2018-10-22 16:00:39,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,612 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-22 16:00:39,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:39,612 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-22 16:00:39,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:00:39,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,613 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,613 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,614 INFO L82 PathProgramCache]: Analyzing trace with hash -657878272, now seen corresponding path program 3 times [2018-10-22 16:00:39,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:39,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,615 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:40,059 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 16:00:40,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,060 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:40,060 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:40,060 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:40,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,061 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:40,072 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:40,073 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:40,086 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:00:40,086 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:40,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,127 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:40,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,186 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:40,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,208 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 12 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 12 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:40,224 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:40,224 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:40,253 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 16:00:40,253 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:40,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,262 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:40,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,285 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 16:00:40,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:40,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4, 4, 4, 4] total 13 [2018-10-22 16:00:40,287 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:40,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:40,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:40,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:00:40,288 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 11 states. [2018-10-22 16:00:40,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:40,496 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-10-22 16:00:40,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:00:40,497 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-22 16:00:40,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:40,498 INFO L225 Difference]: With dead ends: 50 [2018-10-22 16:00:40,498 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:00:40,499 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:40,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:00:40,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-10-22 16:00:40,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:00:40,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-22 16:00:40,505 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2018-10-22 16:00:40,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:40,505 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-22 16:00:40,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:40,506 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-22 16:00:40,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:00:40,507 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:40,507 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:40,507 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:40,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:40,508 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 4 times [2018-10-22 16:00:40,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:40,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:40,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:40,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:40,509 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:40,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:40,738 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 16:00:40,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,739 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:40,739 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:40,739 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:40,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,740 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:40,747 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:40,747 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:40,765 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:40,765 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:40,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,822 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:40,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,254 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:41,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,276 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 14 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 14 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:41,291 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:41,291 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:41,317 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:41,318 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:41,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,360 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:41,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,645 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 35 proven. 63 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:41,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:41,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 10, 9, 9] total 25 [2018-10-22 16:00:41,651 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:41,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:41,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:41,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:41,653 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 11 states. [2018-10-22 16:00:41,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:41,805 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2018-10-22 16:00:41,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:41,805 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-22 16:00:41,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:41,806 INFO L225 Difference]: With dead ends: 52 [2018-10-22 16:00:41,806 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:00:41,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 123 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=201, Invalid=399, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:41,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:00:41,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-22 16:00:41,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-22 16:00:41,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2018-10-22 16:00:41,812 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2018-10-22 16:00:41,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:41,812 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2018-10-22 16:00:41,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:41,813 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2018-10-22 16:00:41,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-22 16:00:41,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:41,814 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:41,814 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:41,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:41,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1580391035, now seen corresponding path program 5 times [2018-10-22 16:00:41,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:41,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:41,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:41,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:41,815 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:41,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:42,069 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 16:00:42,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,070 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:42,070 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:42,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:42,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,070 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:42,078 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:42,079 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:42,262 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:00:42,262 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:42,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,560 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:42,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,270 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:43,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,291 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 16 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 16 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:43,307 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:43,307 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:43,421 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-10-22 16:00:43,421 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:43,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,439 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:43,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,854 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 40 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:43,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:43,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 11, 10, 10] total 28 [2018-10-22 16:00:43,858 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:43,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:00:43,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:00:43,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=507, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:43,860 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2018-10-22 16:00:44,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:44,208 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2018-10-22 16:00:44,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:44,208 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-22 16:00:44,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:44,209 INFO L225 Difference]: With dead ends: 55 [2018-10-22 16:00:44,209 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:00:44,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=249, Invalid=507, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:44,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:00:44,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 16:00:44,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:00:44,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2018-10-22 16:00:44,216 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 38 [2018-10-22 16:00:44,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:44,217 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2018-10-22 16:00:44,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:00:44,217 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2018-10-22 16:00:44,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:00:44,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:44,218 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:44,218 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:44,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:44,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1194339070, now seen corresponding path program 6 times [2018-10-22 16:00:44,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:44,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:44,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,220 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:44,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:44,413 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 16:00:44,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,413 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:44,413 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:44,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:44,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,414 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:44,429 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:44,429 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:44,529 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:00:44,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,610 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:44,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,684 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:44,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,705 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 18 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 18 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:44,720 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:44,721 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:44,838 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:00:44,838 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,859 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:44,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,868 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 64 proven. 7 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:00:44,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:44,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 5, 5, 5, 5] total 19 [2018-10-22 16:00:44,870 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:44,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:00:44,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:00:44,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=241, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:00:44,871 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2018-10-22 16:00:45,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:45,571 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2018-10-22 16:00:45,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:00:45,572 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2018-10-22 16:00:45,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:45,574 INFO L225 Difference]: With dead ends: 65 [2018-10-22 16:00:45,574 INFO L226 Difference]: Without dead ends: 52 [2018-10-22 16:00:45,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=129, Invalid=291, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:00:45,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-22 16:00:45,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-10-22 16:00:45,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:00:45,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-22 16:00:45,582 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2018-10-22 16:00:45,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:45,582 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-22 16:00:45,582 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:00:45,582 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-22 16:00:45,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:00:45,583 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:45,583 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:45,584 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:45,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:45,584 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 7 times [2018-10-22 16:00:45,584 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:45,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,585 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:45,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:45,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:46,225 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 16:00:46,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,226 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:46,226 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:46,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:46,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,227 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:46,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:46,236 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:46,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:46,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,304 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:00:46,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:47,048 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:00:47,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,068 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 20 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 20 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:47,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:47,084 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:47,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:47,133 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:00:47,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:47,822 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 80 proven. 135 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-22 16:00:47,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:47,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13, 12, 12] total 35 [2018-10-22 16:00:47,824 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:47,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:00:47,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:00:47,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=808, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:47,826 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 15 states. [2018-10-22 16:00:48,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:48,065 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-10-22 16:00:48,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:00:48,066 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-22 16:00:48,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:48,068 INFO L225 Difference]: With dead ends: 67 [2018-10-22 16:00:48,068 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 16:00:48,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 165 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=382, Invalid=808, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:48,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 16:00:48,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-10-22 16:00:48,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-22 16:00:48,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2018-10-22 16:00:48,076 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2018-10-22 16:00:48,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:48,077 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2018-10-22 16:00:48,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:00:48,077 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2018-10-22 16:00:48,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-22 16:00:48,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:48,078 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:48,079 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:48,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:48,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1227511363, now seen corresponding path program 8 times [2018-10-22 16:00:48,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:48,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:48,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,081 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:48,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:48,512 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 16:00:48,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,513 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:48,513 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:48,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:48,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,513 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:48,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:48,522 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:48,536 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:48,537 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:48,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:48,567 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 16:00:48,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:49,244 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 16:00:49,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,265 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 22 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 22 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:49,281 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:49,281 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:49,322 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:49,323 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:49,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:49,378 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 16:00:49,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:49,430 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 16:00:49,432 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:49,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:00:49,433 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:49,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:00:49,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:00:49,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:00:49,435 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2018-10-22 16:00:49,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:49,799 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2018-10-22 16:00:49,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:00:49,800 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-22 16:00:49,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:49,801 INFO L225 Difference]: With dead ends: 70 [2018-10-22 16:00:49,801 INFO L226 Difference]: Without dead ends: 54 [2018-10-22 16:00:49,802 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:00:49,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-22 16:00:49,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-22 16:00:49,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-22 16:00:49,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2018-10-22 16:00:49,809 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 50 [2018-10-22 16:00:49,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:49,809 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2018-10-22 16:00:49,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:00:49,810 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2018-10-22 16:00:49,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-22 16:00:49,811 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:49,811 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:49,811 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:49,811 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:49,811 INFO L82 PathProgramCache]: Analyzing trace with hash 191319488, now seen corresponding path program 9 times [2018-10-22 16:00:49,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:49,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,812 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:49,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,813 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:49,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:50,086 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 16:00:50,086 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,087 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:50,087 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:50,087 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:50,087 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,087 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:50,094 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:50,095 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:50,111 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:00:50,111 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:00:50,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,361 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:00:50,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,382 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 24 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 24 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:50,397 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:50,397 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:50,465 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:00:50,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,493 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:00:50,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,502 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 15 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-10-22 16:00:50,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:50,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 6, 6, 6, 6] total 25 [2018-10-22 16:00:50,504 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:50,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:00:50,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:00:50,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=433, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:50,508 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 21 states. [2018-10-22 16:00:51,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:51,425 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2018-10-22 16:00:51,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:00:51,425 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 53 [2018-10-22 16:00:51,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:51,426 INFO L225 Difference]: With dead ends: 80 [2018-10-22 16:00:51,426 INFO L226 Difference]: Without dead ends: 64 [2018-10-22 16:00:51,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 206 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=221, Invalid=535, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:00:51,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-22 16:00:51,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-10-22 16:00:51,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:00:51,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-22 16:00:51,434 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 53 [2018-10-22 16:00:51,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:51,435 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-22 16:00:51,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:00:51,435 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-22 16:00:51,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:00:51,436 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:51,436 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:51,437 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:51,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:51,437 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 10 times [2018-10-22 16:00:51,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:51,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:51,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,438 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:51,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:51,868 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 16:00:51,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:51,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:51,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:51,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:51,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:51,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:51,881 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:51,881 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:51,903 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:51,904 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:51,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:51,976 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:51,976 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:53,204 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:53,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,225 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 26 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 26 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:53,240 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:53,240 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:53,279 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:53,279 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:53,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:53,317 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:53,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:54,294 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 143 proven. 234 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:00:54,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:54,297 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15, 16, 15, 15] total 45 [2018-10-22 16:00:54,297 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:54,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:00:54,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:00:54,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1360, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:00:54,299 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 19 states. [2018-10-22 16:00:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:54,716 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2018-10-22 16:00:54,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:00:54,717 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-22 16:00:54,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:54,718 INFO L225 Difference]: With dead ends: 82 [2018-10-22 16:00:54,718 INFO L226 Difference]: Without dead ends: 63 [2018-10-22 16:00:54,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 207 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=620, Invalid=1360, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:00:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-22 16:00:54,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-10-22 16:00:54,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-22 16:00:54,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2018-10-22 16:00:54,726 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 59 [2018-10-22 16:00:54,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:54,727 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2018-10-22 16:00:54,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:00:54,727 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2018-10-22 16:00:54,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-22 16:00:54,728 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:54,728 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:54,728 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:54,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:54,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1464125371, now seen corresponding path program 11 times [2018-10-22 16:00:54,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:54,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:54,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:54,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:54,730 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:54,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:55,468 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 16:00:55,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:55,468 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:55,468 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:55,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:55,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:55,468 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:55,476 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:55,476 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:04,543 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:03:04,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:05,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:05,277 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 80 proven. 360 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:03:05,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:06,890 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 80 proven. 360 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:03:06,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:06,911 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 28 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 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:06,927 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:06,927 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:07,292 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:03:07,293 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:07,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:07,332 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:03:07,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:08,933 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 154 proven. 273 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:03:08,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:08,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 19, 16, 16] total 50 [2018-10-22 16:03:08,935 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:08,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:03:08,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:03:08,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1732, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:03:08,937 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 20 states. [2018-10-22 16:03:10,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:10,099 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2018-10-22 16:03:10,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:03:10,099 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-22 16:03:10,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:10,100 INFO L225 Difference]: With dead ends: 85 [2018-10-22 16:03:10,101 INFO L226 Difference]: Without dead ends: 66 [2018-10-22 16:03:10,102 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 215 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=718, Invalid=1732, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:03:10,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-22 16:03:10,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-22 16:03:10,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:03:10,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2018-10-22 16:03:10,109 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 62 [2018-10-22 16:03:10,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:10,109 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2018-10-22 16:03:10,109 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:03:10,109 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2018-10-22 16:03:10,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:03:10,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:10,110 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:10,110 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:10,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:10,111 INFO L82 PathProgramCache]: Analyzing trace with hash 369721150, now seen corresponding path program 12 times [2018-10-22 16:03:10,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:10,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:10,111 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:10,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:10,111 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:10,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:10,504 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 16:03:10,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,505 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:10,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:10,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:10,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,505 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:10,512 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:10,512 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:16,256 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:03:16,256 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:16,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:16,916 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:03:16,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:17,121 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:03:17,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:17,142 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 30 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 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:17,156 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:03:17,156 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:17,438 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:03:17,438 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:17,442 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:17,461 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:03:17,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:17,530 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 26 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-10-22 16:03:17,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:17,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 7, 7, 7] total 31 [2018-10-22 16:03:17,533 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:17,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:03:17,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:03:17,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=681, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:03:17,535 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 26 states. [2018-10-22 16:03:23,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:23,265 INFO L93 Difference]: Finished difference Result 95 states and 108 transitions. [2018-10-22 16:03:23,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:03:23,266 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 65 [2018-10-22 16:03:23,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:23,267 INFO L225 Difference]: With dead ends: 95 [2018-10-22 16:03:23,267 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:03:23,268 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 253 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=337, Invalid=853, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:03:23,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:03:23,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-10-22 16:03:23,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:03:23,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-22 16:03:23,274 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 65 [2018-10-22 16:03:23,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:23,275 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-22 16:03:23,275 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:03:23,275 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-22 16:03:23,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-22 16:03:23,276 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:23,276 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:23,277 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:23,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:23,277 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 13 times [2018-10-22 16:03:23,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:23,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:23,278 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:23,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:23,278 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:23,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:24,326 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 16:03:24,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:24,326 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:24,326 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:24,326 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:24,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:24,327 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:24,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:24,335 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:24,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:24,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:24,427 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:03:24,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:26,485 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:03:26,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:26,505 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 32 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 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:26,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:26,520 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:26,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:26,596 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:03:26,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:28,659 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 224 proven. 360 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:03:28,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:28,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18, 19, 18, 18] total 55 [2018-10-22 16:03:28,660 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:28,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:03:28,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:03:28,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=2055, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:28,664 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 23 states. [2018-10-22 16:03:29,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:29,439 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2018-10-22 16:03:29,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:03:29,439 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-22 16:03:29,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:29,441 INFO L225 Difference]: With dead ends: 97 [2018-10-22 16:03:29,441 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:03:29,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 249 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=915, Invalid=2055, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:29,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:03:29,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-10-22 16:03:29,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-22 16:03:29,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-10-22 16:03:29,449 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 71 [2018-10-22 16:03:29,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:29,449 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-10-22 16:03:29,449 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:03:29,449 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-10-22 16:03:29,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-22 16:03:29,450 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:29,450 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:29,451 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:29,451 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:29,451 INFO L82 PathProgramCache]: Analyzing trace with hash 10718589, now seen corresponding path program 14 times [2018-10-22 16:03:29,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:29,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:29,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:29,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:29,452 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:29,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:29,859 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 16:03:29,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:29,859 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:29,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:29,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:29,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:29,860 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:29,867 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:29,867 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:29,887 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:29,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:29,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:29,903 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 16:03:29,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:31,327 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 16:03:31,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:31,347 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 34 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 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:31,361 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:31,361 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:31,412 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:31,413 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:31,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:31,457 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 16:03:31,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:31,502 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 16:03:31,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:31,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 46 [2018-10-22 16:03:31,504 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:31,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:03:31,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:03:31,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:03:31,505 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 24 states. [2018-10-22 16:03:32,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:32,055 INFO L93 Difference]: Finished difference Result 100 states and 111 transitions. [2018-10-22 16:03:32,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:03:32,056 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-22 16:03:32,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:32,057 INFO L225 Difference]: With dead ends: 100 [2018-10-22 16:03:32,057 INFO L226 Difference]: Without dead ends: 78 [2018-10-22 16:03:32,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 272 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:03:32,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-22 16:03:32,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-10-22 16:03:32,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-22 16:03:32,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2018-10-22 16:03:32,066 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 74 [2018-10-22 16:03:32,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:32,066 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2018-10-22 16:03:32,066 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:03:32,066 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2018-10-22 16:03:32,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:03:32,067 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:32,067 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:32,068 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:32,068 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:32,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1880758400, now seen corresponding path program 15 times [2018-10-22 16:03:32,068 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:32,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:32,069 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:32,069 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:32,069 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:32,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:32,707 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 16:03:32,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:32,707 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:32,707 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:32,707 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:32,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:32,707 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:32,715 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:32,716 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:32,754 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:03:32,754 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:32,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:33,022 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:03:33,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:33,333 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:03:33,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:33,354 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 36 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 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:33,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:33,369 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:33,484 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-22 16:03:33,484 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:33,487 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:33,498 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:03:33,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:33,510 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 289 proven. 40 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-10-22 16:03:33,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:33,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 8, 8, 8, 8] total 37 [2018-10-22 16:03:33,511 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:33,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:03:33,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:03:33,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=985, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:03:33,513 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand 31 states. [2018-10-22 16:03:41,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:41,700 INFO L93 Difference]: Finished difference Result 110 states and 125 transitions. [2018-10-22 16:03:41,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:03:41,700 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 77 [2018-10-22 16:03:41,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:41,701 INFO L225 Difference]: With dead ends: 110 [2018-10-22 16:03:41,701 INFO L226 Difference]: Without dead ends: 88 [2018-10-22 16:03:41,702 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 300 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:03:41,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-22 16:03:41,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-10-22 16:03:41,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-22 16:03:41,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-22 16:03:41,710 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-22 16:03:41,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:41,711 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-22 16:03:41,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:03:41,711 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-22 16:03:41,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-22 16:03:41,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:41,712 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:41,712 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:41,712 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:41,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-22 16:03:41,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:41,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:41,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:41,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:41,714 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:41,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:42,731 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:03:42,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:42,731 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:42,731 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:42,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:42,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:42,731 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:42,740 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:42,740 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:42,766 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:42,766 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:42,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:42,804 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:03:42,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:44,537 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:03:44,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:44,557 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 38 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 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:44,572 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:44,572 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:44,628 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:44,628 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:44,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:44,650 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:03:44,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:46,676 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:03:46,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:46,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22, 21, 21] total 65 [2018-10-22 16:03:46,678 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:46,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:03:46,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:03:46,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=2869, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:03:46,680 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-22 16:03:47,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:47,339 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-22 16:03:47,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:03:47,339 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-22 16:03:47,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:47,340 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:03:47,341 INFO L226 Difference]: Without dead ends: 90 [2018-10-22 16:03:47,343 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 291 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1291, Invalid=2869, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:03:47,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-22 16:03:47,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-22 16:03:47,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:03:47,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-22 16:03:47,350 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-22 16:03:47,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:47,350 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-22 16:03:47,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:03:47,350 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-22 16:03:47,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:03:47,351 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:47,351 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:47,352 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:47,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:47,352 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-22 16:03:47,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:47,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:47,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:47,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:47,353 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:47,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:47,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:03:47,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:47,996 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:47,996 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:47,996 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:47,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:47,996 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:48,005 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:48,006 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown